作者： Zhou, Nan;Liu, Longhai;Zhou, Zhipeng;Zhang, Ye;Li, Minghui;...

期刊： Journal of the American Ceramic Society,2020年103(3):1798-1808 ISSN：0002-7820

通讯作者： Xia, Mao;Zhou, Zhi

作者机构： [Xia, Mao; Zhou, Cheng; Zhou, Zhipeng; Zhang, Ye; Zhou, Nan; Zhou, Zhi; Liu, Longhai; Xia, M; Li, Minghui] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhou, Nan; Zhou, Zhi; Liu, Longhai] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.

通讯机构： [Xia, M; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： cation vacancies;charge compensation;defects;LED plant lighting;phosphors

摘要： <jats:title>Abstract</jats:title><jats:p>In the recent years, Mn<jats:sup>4+</jats:sup>‐doped phosphors for indoor plant cultivation have received extensive concern owing to the far‐red emission that can match well with the absorption spectra of plant pigments. Whereas, many Mn<jats:sup>4+</jats:sup>‐doped phosphors still face some challenges such as poor light efficiency and low thermal stability. It is an effective way to resolve these problems via cation vacancies engineering. Herein, the Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphors are successfully synthesized by combustion method. The luminescence intensity of Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphor is enhanced through engineering Ca<jats:sup>2+</jats:sup> and Zn<jats:sup>2+</jats:sup> vacancies according to the charge compensation mechanism. The optimal content of each Ca<jats:sup>2+</jats:sup> and Zn<jats:sup>2+</jats:sup> vacancy is equal to be 0.3. Furthermore, the defect formation is accompanied with lattice distortion, which plays a vital role in driving the excited phonon traps to reduce the energy loss by non‐radiation transitions. Therefore, the thermal stability of Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphor is also improved via engineering cation vacancies. In addition, the Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphors can be effectively excited by blue light and it exhibits far‐red emission due to the Mn<jats:sup>4+</jats:sup> spin‐forbidden <jats:sup>2</jats:sup>E→<jats:sup>4</jats:sup>A<jats:sub>2</jats:sub> transition. The results suggest that the Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphors can have a tremendous potential in indoor plant cultivation.</jats:p>

语种： 英文

作者： Zhou, Nan;Wu, Yufan;Li, Yiran;Yang, Jiankui;Zhou, Qing;...

期刊： Applied Surface Science,2020年500:144026 ISSN：0169-4332

通讯作者： Xia, Mao;Zhou, Zhi

作者机构： [Wu, Yufan; Xia, Mao; Zhou, Qing; Yang, Jiankui; Guo, Yuwei; Zhou, Nan; Zhou, Zhi; Xia, M; Li, Yiran] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wu, Yufan; Xia, Mao; Zhou, Qing; Yang, Jiankui; Guo, Yuwei; Zhou, Nan; Zhou, Zhi; Xia, M; Li, Yiran] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao; Yang, Jiankui; Zhou, Nan; Zhou, Zhi; Xia, M] Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha, Hunan, Peoples R China.

通讯机构： [Xia, M; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha, Hunan, Peoples R China.

关键词： Anode;Coating;Electrochemical kinetics;Lithium-ion batteries;Si@TiO2-B/CNTs composite

摘要： As an anode with ultrahigh capacity (4200 mAh g−1), silicon (Si) has inherent defects, such as drastic volume change (~300%) and poor conductivity. To cope with these problems, constructing a rigid shell (e.g. TiO2) on the surface of Si particles is an effective method. Typically, monoclinic titanium dioxide (TiO2-B) has the more excellent electrochemical performance among the various crystalline of TiO2 (anatase, rutile, etc.) for its open channel and characteristic pseudocapacitive effect. In addition, carbon nanotubes (CNTs) are good conductor of electricity. It is hopeful to increase the conductivity of the Si anode by adding CNTs. In this work, therefore, a Si@TiO2-B/CNTs composite is prepared by hydrothermal method. The composite exhibits superior electrochemical properties during the half-cell test (1184 mAh g−1 under 0.1 A g−1 at 200th cycles). Furthermore, the electrochemical kinetics of the materials were studied by cyclic voltammetry, which demonstrated that coating TiO2-B could increase the capacitive effects of the composite (68.75%). © 2019 Elsevier B.V.

语种： 英文

作者： Lou, Sunqi;Zhou, Zhi*;Gan, Weijiang;Xuan, Tongtong;Bao, Zhen;...

期刊： Green Chemistry,2020年22(16):5257-5261 ISSN：1463-9262

通讯作者： Wang, Jing;Zhou, Zhi;Liu, Ru-Shi

作者机构： [Gan, Weijiang; Cao, Luyu; Lou, Sunqi; Si, Shuaichen; Wang, Jing] Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Minist Educ,Key Lab Bioinorgan & Synthet Chem,Sta, Guangzhou 510275, Guangdong, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 10128, Hunan, Peoples R China.;[Xuan, Tongtong] Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China.;[Bao, Zhen; Liu, Ru-Shi] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan.;[Bao, Zhen; Liu, Ru-Shi] Natl Taiwan Univ, Adv Res Ctr Green Mat Sci & Technol, Taipei 106, Taiwan.

通讯机构： [Wang, Jing] S;[Zhou, Zhi] H;[Liu, Ru-Shi] N;Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Minist Educ,Key Lab Bioinorgan & Synthet Chem,Sta, Guangzhou 510275, Guangdong, Peoples R China.;Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 10128, Hunan, Peoples R China.

摘要： Here, we present the microemulsion method using sodium dodecylbenzenesulfonate and hydrofluoric acid for the in situ synthesis of brightly luminescent CsPbBr3/CsPb2Br5 composite nanocrystals (NCs) in aqueous solution. The obtained CsPbBr3/CsPb2Br5 composite NCs exhibit a photoluminescence quantum yield of 77.0% and a full width at half maximum of 16.0 nm. And solid-state back-lighting devices were fabricated by combining CsPbBr3/CsPb2Br5 composite NCs and red-emitting K2SiF6:Mn4+ phosphors with blue light. The as-fabricated device exhibits a wide color gamut of about 95.8% of the Rec. 2020. This work provides a green, low-cost, and in situ water-phase route to synthesize high-quality cesium lead halide NCs for their practical applications in solid-state back-lighting devices. This journal is © The Royal Society of Chemistry.

语种： 英文

作者： Zhao, Kuangmin;Liu, Suqin*;Ye, Guanying;Wei, Xianli;Su, Yuke;...

期刊： ChemSusChem,2020年13(6):1556-1567 ISSN：1864-5631

通讯作者： Liu, Suqin;He, Zhen

作者机构： [Su, Yuke; Wei, Xianli; He, Zhen; Liu, Suqin; Ye, Guanying; Zhu, Weiwei; Zhao, Kuangmin] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Su, Yuke; Wei, Xianli; He, Zhen; Liu, Suqin; Ye, Guanying; Zhu, Weiwei; Zhao, Kuangmin] Cent S Univ, Hunan Prov Key Lab Chem Power Sources, Changsha 410083, Hunan, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Liu, SQ; He, Z] C;Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;Cent S Univ, Hunan Prov Key Lab Chem Power Sources, Changsha 410083, Hunan, Peoples R China.

关键词： 2D Materials;M-N-C;Metal-organic frameworks;Mg-air battery;electrocatalysis

摘要： The development of nonprecious metal–nitrogen–carbon (M-N-C) materials with efficient metal utilization and abundant active sites for the oxygen reduction reaction (ORR) is of great significance for fuel cells and metal–air batteries. Ultrasmall 2 D CoxZn2−x(benzimidazole)4 [CoxZn2−x(bim)4] bimetallic metal–organic framework (MOF) nanosheets (≈2 nm thick) are synthesized by a novel bottom-up strategy and then thermally converted into a core–shell structure of sub-5 nm Co nanodots (NDs) wrapped with 2 to 5 layers of Co,N-codoped graphene (Co@FLG). The size of the Co NDs in Co@FLG could be precisely controlled by the Co/Zn ratio in the CoxZn2−x(bim)4 nanosheet. As an ORR electrocatalyst, the optimized Co@FLG exhibits an excellent half-wave potential of 0.841 V (vs. RHE), a high limiting current density of 6.42 mA cm−2, and great stability in alkaline electrolyte. Co@FLG also has great ORR performance in neutral electrolyte, as well as in Mg–air batteries. The experimental studies and DFT calculations reveal that the high performance of Co@FLG is mainly attributed to its great O2 absorptivity, which is endowed by the abundant Co−Nx and pyridinic-N in the FLG shell and the strong electron-donating ability from the Co ND core to the FLG shell. This elevates the eg orbital energy of CoII and lowers the activation energy for breaking the O=O/O−O bonds. This work sheds light on the design and fabrication of 2 D MOFs and MOF-derived M-N-C materials for energy storage and conversion applications. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

语种： 英文

作者： Zhao, Xiao-Ru;Xu, Xia;Teng, Jie;Zhou, Nan;Zhou, Zhi;...

期刊： Ecotoxicology and Environmental Safety,2019年176:11-19 ISSN：0147-6513

通讯作者： Yu, Jin-Gang

作者机构： [Jiang, Xin-Yu; Jiao, Fei-Peng; Xu, Xia; Yu, Jin-Gang; Zhao, Xiao-Ru] Cent S Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.;[Teng, Jie] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Yu, Jin-Gang; Zhou, Nan; Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Yu, Jin-Gang] C;Cent S Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.

关键词： Adsorption;Graphene oxide;Inorganic/organic substances;Maize amylopectin;Mechanism

摘要： Three-dimensional (3D) porous graphene oxide-maize amylopectin (GO-MA) composites with controllable pore-sizes composites in the range of 6-40nm were prepared by facile hydrothermal-assisted assembly approaches. The morphologies, pore sizes, specific surface area (SSA) and compositions of GO-MAx:y composites with and different GO-to-MA mass ratios (x:y) were characterized by scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). To reveal the adsorption-desorption mechanism, effects of contact time, temperature, initial adsorbate concentration, pH value of the solution on the adsorption process were studied in detail. The adsorption capacities of 3D GO-MA20:1 composite for organic contaminants including tert-butyl hydroquinone (TBHQ), p-aminophenol (PAP), p-nitrophenol (PNP), o-nitrophenol (MNP), hydroquinone (HQ), alizarin red S (ARS) and neutral red (NR) were 22.17, 116.4, 44.78, 36.96, 16.10, 39.92 and 24.23mgg(-1), respectively. The adsorption capacities of GO-MA30:1 composite for inorganic substances including Pb(2+), Mn(2+), Cr2O7(2-), Cd(2+), Cu(2+), Nd(3+), La(3+), Y(3+), Yb(3+) and Er(3+) were 84.76, 7.92, 13.6, 17.64, 30.56, 25.52, 12.48, 16.96, 23.32 and 30.32mgg(-1), respectively. In addition, GO-MAx:y composites also exhibited high mechanical properties and good reusability. Consequently, GO-MAx:y composites could be used as reusable adsorbents for removal/enrichment inorganic/organic substances in aqueous solutions.

语种： 英文

作者： Zhou, Nan;Gao, Peixing;Yang, Yimei;Zhong, Yuan*;Xia, Mao;...

期刊： Journal of the Taiwan Institute of Chemical Engineers,2019年104:360-368 ISSN：1876-1070

通讯作者： Zhong, Yuan;Zhou, Zhi

作者机构： [Xia, Mao; Zhong, Yuan; Zhou, Zhi; Zhang, Ye; Yang, Yimei; Zhou, Nan; Gao, Peixing] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhang, Ye; Yang, Yimei; Zhong, Yuan; Zhou, Nan; Gao, Peixing; Zhou, Zhi] Hunan Prov Engn Technol Res Ctr Opt Agr, Changsha 410128, Hunan, Peoples R China.;[Tian, Yun; Lu, Xiangyang] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhong, Y; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Activation energy;Citrus fruits;Emission spectroscopy;High temperature applications;Light emitting diodes;Phosphors;Solid state reactions;Thermodynamic stability;Chromaticity coordinates;Concentration quenching;Concentration-dependent;Diffuse reflection spectra;Excitation and emission spectra;High temperature solid-state reaction;Internal quantum efficiency;Plant growth;Light emission

摘要： In this paper, a series of novel orange-red emission phosphors Sr8ZnY(PO4)(7):Sm3+ (SZYP:Sm3+) were synthesized by high-temperature solid-state reaction. The photoluminescence and concentration-dependent properties of this phosphor were investigated carefully through diffuse reflection spectra, excitation and emission spectra, Commission Internationale de l'Eclairage (CIE) chromaticity coordinate and decay times. SZYP:Sm3+ could be efficiently excited by n-UV and blue lights which center at 318, 345, 363, 376, 401, 410, 440 and 475 nm, respectively. The characteristic orange-red emission peaking at 563, 601 and 647 nm had been detected, which should be attributed to the characteristic f-f forbidden transition of Sm3+. The internal quantum efficiency (IQE) of ideal phosphor of SZYP:0.09Sm(3+) reached as high as 47%. In addition, The concentration quenching mechanism and thermal stability of SZYP:Sm3+ were further investigated. It was found SZYP:Sm3+ can maintain 93% of initial emission intensity at 150 degrees C and the corresponding activation energy was calculated to be 0.26 eV based on Arrhenius formula. The emission intensity of 1.0Mg(2+) and 0.02Al(3+) incorporated SZYP:0.09Sm(3+) reached up to 134% and 117% of the initial value, respectively. Moreover, (light-emitting diodes) LED devices were fabricated by employing the optimized samples as orange-red component with 365 nm n-UV chips. The desired emission in plant absorption region and extremely high thermal stability imply that SZYP:Sm3+ is suitable for the application in plant growth LED lighting. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

语种： 英文

作者： Xiang, Yujia;Xu, Zhangyi;Wei, Yuyi;Zhou, Yaoyu*;Yang, Xiao;...

期刊： Journal of Environmental Management,2019年237:128-138 ISSN：0301-4797

通讯作者： Zhou, Yaoyu;Yang, Jian

作者机构： [Xu, Zhangyi; Wei, Yuyi; Xiang, Yujia; Yang, Yuan; Yang, Jian; Zhou, Yaoyu; Zhang, Jiachao; Zhou, YY; Yang, J; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Xu, Zhangyi; Wei, Yuyi; Xiang, Yujia; Yang, Yuan; Yang, Jian; Zhou, Yaoyu; Zhang, Jiachao; Luo, Lin] Hunan Agr Univ, Hunan Int Sci & Technol Cooperat Base Agr Typ Pol, Changsha 410028, Hunan, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhou, Yaoyu; Yang, Xiao] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China.

通讯机构： [Zhou, YY; Yang, J] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

关键词： Activated carbon;Activated carbon treatment;Amides;Antibiotics;Environmental technology;Organic pollutants;Sulfur compounds;Water pollution;Adsorption mechanism;Adsorption process;Antibiotic removal;Biochar;Carbon based materials;Carbonaceous materials;Influencing factor;Removal mechanism;Soil and water;Soil environment;Adsorption;activated carbon;adsorbent;antibiotic agent;carbon;carbon nanotube;chloramphenicol;graphene;quinoline derived antiinfective agent;sulfonamide;tetracycline derivative;antiinfective agent;carbon nanotube;charcoal;graphite;activated carbon;adsorption;antibiotics;carbon;carbon nanotube;factor analysis;organic pollutant;pollutant removal;adsorption kinetics;Article;process optimization;waste component removal;adsorption;water pollutant;Adsorption;Anti-Bacterial Agents;Charcoal;Graphite;Nanotubes, Carbon;Water Pollutants, Chemical

摘要： With the development of the removal of organic pollutants in the soil and water environment, antibiotics have been considered as emerging pollutants and received considerable attention among the scientific community. Thus, there is a need for an effective, economical, fast, operational feasible and environmental-friendly technology to remove antibiotics. Adsorption technology would be one of the most promising option on the basis that it best meets the criteria we set out above. From the most primitive activated carbon to the most innovative modified biochar, carbon-based materials have played a significant role in the adsorption process of antibiotics all the time. This paper reviews the adsorption behavior of some representative antibiotics (e.g., chloramphenicols, sulfonamides, tetracyclines, flouroquinolones) over various carbonaceous materials (i.e., activated carbon, carbon nanotubes, graphene, and biochar). Nevertheless, in addition to the structural characteristics and adsorption capacities of carbon-based materials, a special emphasis was placed on the underlying adsorption mechanisms and roles of different influencing factors in the adsorption process. Moreover, the knowledge gaps and research challenges have been highlighted, including design and optimization of the carbonaceous materials for antibiotics adsorption. © 2019 Elsevier Ltd

语种： 英文

作者： 周智;吴贤波;钟美娥;周南

期刊： 化工时刊,2019年33(02):51-52 ISSN：1002-154X

作者机构： 湖南农业大学 理学院,湖南 长沙,410128;[钟美娥; 周南; 周智; 吴贤波] 湖南农业大学

关键词： 材料化学;实验教学;改革

摘要： 实验教学是高校教学的重要环节之一, 亦是材料化学专业人才培养的一个重要组成部分, 对材料化学专业课程实验教学进行改革与探究, 对培养高素质的创新型人才具有非常重要的意义.随着新时代的发展, 实验课程教学早已从书本转移到实际操作.进行实际实验操作不仅可以提高大学生的实践能力, 还可以开拓其创新思维、提高创新能力.但是, 现在的材料化学专业课程实验教学已经不能完全满足新时代的发展对材料化学专业学生的要求.通过实践证明, 实验教学与专业科研软件教学能够更加全面的提高材料化学专业学生的综合能力, 更加满足社会对学生能力的要求.

语种： 中文

作者： Zhong, Yuan;Gai, Shujie;Yang, Yimei;Xia, Mao;Zhang, Ye;...

期刊： Journal of Luminescence,2019年214:116600 ISSN：0022-2313

通讯作者： Zhou, Zhi

作者机构： [Xia, Mao; Zhang, Ye; Xiang, Fang; Yang, Yimei; Zhong, Yuan; Zhou, Zhi; Qiu, Fanshan] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhang, Ye; Xiang, Fang; Yang, Yimei; Zhong, Yuan; Gai, Shujie; Zhou, Zhi; Qiu, Fanshan] Hunan Prov Engn Technol Res Ctr Opt Agr, Changsha 410128, Hunan, Peoples R China.;[Gai, Shujie] Hunan Agr Univ, Coll Agr, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhou, Zhi] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Crystal structure;Emission spectroscopy;Light;Light emitting diodes;Phosphors;Photoluminescence;Red Shift;Thermodynamic stability;Color rendering index;Correlated color temperature;Doping concentration;Electroluminescence properties;Hydrothermal reaction;Photoluminescence properties;White LED;White light emitting diodes;Electroluminescence

摘要： Green phosphor is an essential component in phosphor-converted white light-emitting diodes (pc-LEDs). Herein, a novel green-emitting phosphate phosphor Sr8ZnY(PO4)7:Eu2+ (SZYP:Eu2+) was synthesized through hydrothermal reaction method. The crystal structure, photoluminescence properties as well as thermal stability of SZYP:Eu2+ were investigated systematically. SZYP:Eu2+ can be efficiently excited by n-UV light in the range from 220 to 550 nm and shows a broad emission band centered at 520 nm with a full width at half maximum of 86 nm. The optimized doping concentration of Eu2+ was determined to be 0.02 mol. With the increase of Eu2+ content, a subtle red shift about 4 nm in emission spectra was detected. SZYP:Eu2+ also shows comparable thermal stability (45% at 150 °C) and it can be further varied to 44, 40 and 51% by co-doping with Pr3+, Tm3+ and Yb3+, respectively. The white LED device blended with SZYP:Eu2+ shows excellent electroluminescence (EL) properties. The low correlated color temperature (4791 K) and ultrahigh color rendering index (95.8) imply that this phosphor may find a potential application in high-quality white LEDs. © 2019 Elsevier B.V.

语种： 英文

作者： Liu, Yong;Zhou, Zhi*;Huang, Lin;Brik, Mikhail G.;Si, Shuaichen;...

期刊： Journal of Materials Chemistry C,2019年7(8):2401-2407 ISSN：2050-7526

通讯作者： Wang, Jing;Zhou, Zhi;Qiu, Jianbei

作者机构： [Lin, Litian; Si, Shuaichen; Xuan, Tongtong; Liu, Yong; Huang, Lin; Wang, Jing; Liang, Hongbin] Sun Yat Sen Univ, Key Lab Bioinorgan & Synthet Chem, State Key Lab Optoelect Mat & Technol, Sch Chem,Minist Educ, Guangzhou 510275, Guangdong, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 410128, Hunan, Peoples R China.;[Brik, Mikhail G.] Chongqing Univ Posts & Telecommun, Coll Sci, Chongqing 400065, Peoples R China.;[Brik, Mikhail G.] Univ Tartu, Inst Phys, W Ostwald Str 1, EE-50411 Tartu, Estonia.;[Brik, Mikhail G.] Jan Dtugosz Univ, Inst Phys, Armii Krajowej 13-15, PL-42200 Czestochowa, Poland.

通讯机构： [Wang, Jing] S;[Zhou, Zhi] H;[Qiu, Jianbei] K;Sun Yat Sen Univ, Key Lab Bioinorgan & Synthet Chem, State Key Lab Optoelect Mat & Technol, Sch Chem,Minist Educ, Guangzhou 510275, Guangdong, Peoples R China.;Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 410128, Hunan, Peoples R China.

关键词： Color;Fluorine compounds;Light emission;Luminance;Moisture;Phosphors;Precipitation (chemical);Coprecipitation method;Emission intensity;External quantum efficiency;High brightness LEDs;High luminous efficacy;Moisture resistance;Moisture stability;Red emitting phosphor;Light emitting diodes

摘要： Narrow-band red-emitting fluoride phosphors for wide color gamut LED backlights have evoked considerable attention, due to their fascinating optical properties. Unfortunately, poor moisture resistance often restricts their further applications in optoelectronics. Herein we developed a Cs 2 SiF 6 :Mn 4+ red phosphor using a lowerature co-precipitation method and passivating it by using H 2 O 2 . The phosphor shows a very high external quantum efficiency (EQE) of ∼85% and exhibits excellent moisture stability retaining 74% of its emission intensity after being exposed to high temperature (85 °C) and high humidity (85%) (HTHH) for 168 h. Finally, the high brightness white LED devices combined with the passivated Cs 2 SiF 6 :Mn 4+ exhibit high luminous efficacy of 133 lm W -1 and wide color gamut (∼84.7% NTSC). The results demonstrate that the passivated Cs 2 SiF 6 :Mn 4+ with high EQE and excellent moisture-resistance is promising as a narrow-band red emitting phosphor for wide color gamut LED backlights. © 2019 The Royal Society of Chemistry.

语种： 英文

作者： 周智;罗伟;周南

期刊： 化工时刊,2019年33(05):53-54 ISSN：1002-154X

作者机构： 湖南农业大学理学院,湖南长沙,410128;[罗伟; 周南; 周智] 湖南农业大学

关键词： 本科生;化学专业;科研意识;科研能力

摘要： 现阶段的本科教育缺乏对学生科研意识与能力的培养.本人从事化学本科教育多年,发现化学专业的本科生对科研缺乏理解,缺少主动的科研精神和动手意愿.针对这一问题,本文提出了从培养学生的主观能动性,加强理论知识学习,提升动手能力、强化实际操作,培养学生的耐心和自信心,拓展大学生的创新能力等五个方面对本科生的科研意识与能力进行教育,激发本科生的科研兴趣,提升科研能力,为今后本科生进一步的发展打下良好基础.

语种： 中文

作者： 周智;张永丽;周南;杨建奎

期刊： 化工时刊,2019年33(03):53-54 ISSN：1002-154X

作者机构： 湖南农业大学理学院,湖南长沙,410128;[杨建奎; 张永丽; 周南; 周智] 湖南农业大学

关键词： 农业性院校;教学改革;应用型

摘要： 随着我国高等教育事业的不断发展,各大高校各专业大学生的化学课程基本普及,农业性院校更是不可或缺,针对农业性院校化学实验课堂出现的问题。本次化学实验教学改革探析从原因、管理、意识、改进等方面分析并解决问题,为农业性院校培养高素质的应用型人才。

语种： 中文

作者： Zhou, Nan;Zu, Junning;Feng, Qiuju;Chen, Huanli;Li, Juan;...

期刊： Environmental Science and Pollution Research,2019年26(26):26947-26962 ISSN：0944-1344

通讯作者： Zhou, Zhi;Zhuang, Shuxin

作者机构： [Zhong, Mei-e; Chen, Huanli; Li, Juan; Zhou, Nan; Zhou, Zhi; Zu, Junning] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Feng, Qiuju] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Zhuang, Shuxin] Xiamen Univ Technol, Sch Mat Sci & Engn, Key Lab Funct Mat & Applicat Fujian Prov, Xiamen 361024, Fujian, Peoples R China.

通讯机构： [Zhou, Zhi] H;[Zhuang, Shuxin] X;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Xiamen Univ Technol, Sch Mat Sci & Engn, Key Lab Funct Mat & Applicat Fujian Prov, Xiamen 361024, Fujian, Peoples R China.

关键词： Biochar;Pyrolysis condition;Surface property;Tobacco stem;Adsorption mechanism

摘要： To clarify the adsorption mechanism of multi-ions on biochars in competitive environment is very important for the decontamination of co-existed heavy metals. Herein, tobacco stem was pyrolyzed in different temperatures with selected residences to obtain biochars with various surface chemistry. Then the adsorption of co-existed typical heavy-metal ions like lead, cadmium, and copper was studied, followed with systematic analysis of surface properties of the post-adsorption biochars. After carefully examining the adsorption performance and surface property alteration of the demineralized biochars, the adsorption mechanism of multi-ions in competitive environment was discovered. Lead showed the most competitive nature with co-existence of cadmium and copper, but the adsorption capacity reduced significantly with the removal of minerals. Combined with the observation of large amount of lead containing crystals on the post-adsorption biochars, the main adsorption mechanism of lead should be precipitation. The adsorb capability of copper barely changed for biochars with and without minerals, which suggests the best affinity of copper on surface functional groups even with large content of competitors. Biochar that pyrolyzed in 700 °C for 6 h that contained more aromatic structures showed the highest sorbing capability of cadmium, which suggested the dominant position of cation-π interaction in cadmium removal. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： Zhou, Nan;Wang, Yifan;Yao, Denghui;Li, Shikai;Tang, Jiajie;...

期刊： Journal of Cleaner Production,2019年221:63-72 ISSN：0959-6526

通讯作者： Zhong, Mei-e;Zhou, Zhi

作者机构： [Zhong, Mei-e; Zhong, ME; Zhou, Zhi; Li, Shikai; Zhu, Xiaoyu; Shen, Da; Huang, Liyang; Zhou, Nan; Yao, Denghui; Wang, Yifan; Tang, Jiajie] Hunan Agr Univ, Coll Sci, Furong Rd, Changsha 410128, Hunan, Peoples R China.;[Zhong, Mei-e; Zhou, Nan; Zhou, Zhi; Wang, Yifan] Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha 410128, Hunan, Peoples R China.;[Zhou, Nan; Zhou, Zhi; Yao, Denghui] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.

通讯机构： [Zhong, ME; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Furong Rd, Changsha 410128, Hunan, Peoples R China.

关键词： Activation energy;Adsorption;Cadmium compounds;Carbonization;Heavy metals;Hydrogen bonds;Pyrolysis;Sodium Carbonate;Sodium compounds;Soil pollution control;Acidic catalysts;Adsorption properties;Bio chars;Biochar adsorbents;Cadmium adsorption;Heavy metal remediation;Removal efficiencies;Surface functional groups;Ion exchange

摘要： The enhancement of surface functional groups of biochar is essential to improving the biochar contaminant adsorption. Current pyrolysis methods that are accompanied by activation are energy consuming and costly. Herein, a novel wet-pyrolysis system that was carried out in open air, with simultaneous conversion and modification to produce an effective biochar adsorbent, is described. Within this system, the surface of the biochar was oxidized partially to produce sufficient functional groups at the surface, whereas carbonization of the biomass (miscanthus sacchariflora) occurs under an acidic catalyst. The characteristic results confirmed the attachment of abundant surface functional groups, including hydroxyl and carboxyl groups, which increased in content with the ongoing reaction time. Neutralization with sodium carbonate removed the hydrogen bonds and enhanced the adsorption properties. The biochar that was obtained by using this technique exhibited an excellent cadmium adsorption capacity of 197 mg.g −1 and a high removal efficiency of 99%. Analysis of the Cd-loaded biochar indicated that adsorption occurred via ion exchange, and formed cadmium complexes. It could be concluded that this novel wet-pyrolysis system is a promising approach to produce biochar efficiently and cost-effectively for heavy-metal remediation. © 2019 Elsevier Ltd

语种： 英文

作者： Zou, Jiao;Yuan, Meng-Meng;Huang, Zhao-Ning;Chen, Xiao-Qing;Jiang, Xin-Yu;...

期刊： Materials Science and Engineering C: Materials for Biological Applications,2019年103:109848 ISSN：0928-4931

通讯作者： Yu, Jin-Gang

作者机构： [Jiang, Xin-Yu; Zou, Jiao; Jiao, Fei-Peng; Yuan, Meng-Meng; Yu, Jin-Gang; Huang, Zhao-Ning; Chen, Xiao-Qing] Cent S Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.;[Zhou, Nan; Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Yu, Jin-Gang] C;Cent S Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.

关键词： Absorption spectroscopy;Chitosan;Cyclic voltammetry;Electrochemical impedance spectroscopy;Electrochemical sensors;Fourier transform infrared spectroscopy;Glass membrane electrodes;Graphene;Morphology;Nanotubes;Phenols;Scanning electron microscopy;Self assembly;Signal to noise ratio;Yarn;Bis-phenol a;Differential pulse voltammetry;Electrochemical behaviors;Fourier transform infra red (FTIR) spectroscopy;Graphene nanoplatelets;Modified glassy carbon electrode;Multiwalled carbon nanotube (MWCNTs);Zeta potential analysis;Multiwalled carbon nanotubes (MWCN);4,4' isopropylidenediphenol;benzhydryl derivative;carbon nanotube;graphite;phenol derivative;animal;chemistry;electrochemical analysis;milk;sensitivity and specificity;Animals;Benzhydryl Compounds;Electrochemical Techniques;Graphite;Milk;Nanotubes, Carbon;Phenols;Sensitivity and Specificity

摘要： Graphene nanoplatelets (GNPs), multiwalled carbon nanotube (MWCNTs) and chitosan (CS) were self-assembled by a facile one-step hydrothermal reaction to obtain novel MWCNTs-CS enfolded GNPs (GNPs-MWCNTs-CS) composite. Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), UV–visible (UV–vis) absorption spectroscopy and zeta potential analysis were employed to characterize the morphology, surface composition, interaction, surface charge and stability of the GNPs-MWCNTs-CS composite. The electrochemical behaviors of GNPs-MWCNTs-CS composite modified glassy carbon electrode (GNPs-MWCNTs-CS/GCE) were investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The GNPs-MWCNTs-CS/GCE was used for fast and high sensitive determination of bisphenol A (BPA) by differential pulse voltammetry (DPV). Under the optimum conditions, the calibration curve obtained is linear for the current versus the BPA concentration in the range 0.1–100 μM with a detection limit of 0.05 nM (signal-to-noise ratio of 3, S/N = 3). The between-sensor reproducibility was 1.29% (n = 6) for 0.04 mM BPA. The proposed GNPs-MWCNTs-CS/GCE based sensor showed high resistance to interference, good repeatability and excellent reproducibility. Trace BPA in milk samples could also be reliably determined. © 2019

语种： 英文

作者： Zhou, Nan;Wu, Yufan;Zhou, Qing;Li, Yiran;Liu, Shihan;...

期刊： Applied Surface Science,2019年486:292-302 ISSN：0169-4332

通讯作者： Zhou, Zhi;Xia, Mao

作者机构： [Wu, Yufan; Xia, Mao; Zhou, Qing; Zhou, Nan; Zhou, Zhi; Liu, Shihan; Li, Yiran] Hunan Agr Univ, Coll Sci, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;[Wu, Yufan; Xia, Mao; Zhou, Qing; Zhou, Nan; Zhou, Zhi; Liu, Shihan; Li, Yiran] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao; Zhang, Hongbo] Cent S Univ, State Key Lab Power Met, Changsha 410083, Hunan, Peoples R China.

通讯机构： [Zhou, Zhi] H;[Xia, Mao] C;Hunan Agr Univ, Coll Sci, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;Cent S Univ, State Key Lab Power Met, Changsha 410083, Hunan, Peoples R China.

关键词： Hydrothermal method;Li-ion diffusion coefficient;Lithium-ion batteries;SiO;TiO2 (B)

摘要： Silicon monoxide (SiO) is regarded as a great potential anode material for high-energy lithium-ion batteries (LIBs) owing to the high theoretical specific capacity (2650 mAh g−1), low voltage platform, eco-friendly and rich reserves. However, the particle pulverization, induced by large volume change during (de)lithiation, can result in the capacity degrading significantly. As we all know, it is a good strategy that using TiO2 to modify the SiO-based anode. TiO2 can serve as rigid outer layer to keep the structural integrity. In addition, the electrochemical performances of monoclinic TiO2 (B) are better than anatase and rutile TiO2. Therefore, compositing with TiO2 (B) is an admissible method to enhance the electrochemical properties of SiO-based materials. And the pretreated-SiO/TiO2 (B) composites (abbreviated as p-STB) are prepared by hydrothermal treatment at 180 °C for 12 h and then calcined at 325 °C for 2 h. In this paper, p-STB-1 and p-STB-2 are prepared that the weight ratios p-SiO and TiO2 (B) are 4:1 and 3:1, respectively. The structure and components of composites are also performed on X-ray diffraction (XRD), Fourier transform infrared reflectance (FT-IR) spectroscopy, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). For p-STB, TiO2 (B) is mainly covered on the surface of pretreated SiO (p-SiO). The Li-ion diffusion coefficients of as-prepared materials are calculated by cyclic voltammetry and electrochemical impedance spectroscopy. The electrochemical test results suggest that the p-STB-1 has batter cycling performance (730 mAh g−1 after 100th cycle) and admirable rate capacity (450 mAh g−1 under 3.2 A g−1). The modified method, which was compositing with TiO2 (B), is beneficial to the commercialization of SiO-based materials. © 2019 Elsevier B.V.

语种： 英文

作者： Xia, Mao;Gu, Simin;Zhou, Cheng;Liu, Longhai;Zhong, Yuan;...

期刊： RSC Advances,2019年9(16):9244-9252 ISSN：2046-2069

通讯作者： Zhou, Zhi

作者机构： [Xia, Mao; Zhou, Cheng; Zhang, Yongli; Zhong, Yuan; Zhou, Zhi; Liu, Longhai; Gu, Simin] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao] Cent S Univ, State Key Lab Met, Changsha 410083, Hunan, Peoples R China.;[Xia, Mao; Zhang, Yongli; Zhong, Yuan; Zhou, Zhi; Gu, Simin] Technol Res Ctr Hunan Opt Agr Engn, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhou, Zhi] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

摘要： Plant growth LEDs have attracted broad attention in modern society, desperate for specific phosphors with a characteristic emission band. A novel Mn4+ and Dy3+ co-doped Y3Al4GaO12 phosphor were successfully prepared through a conventional high-temperature solid-state reaction. A three band emission including red (625-700 nm), orange (550-607 nm) and blue (462-490 nm) is observed in these phosphors when excited under a near-UV lamp, which is ascribed to 2E → 4A2 of Mn4+, 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 of Dy3+, respectively. The three emissions match the absorption spectra of chlorophyll A and chlorophyll B well. Meanwhile, the energy transfer from Dy3+ to Mn4+ was confirmed by the luminescence spectra and lifetime analysis. Finally, an LED device was fabricated that consisted of a 365 nm ultraviolet chip and the Y3Al4GaO12:Mn4+,Dy3+ phosphor. The excellent properties indicate that the synthesized phosphor has a promising application in the optical agricultural industry. © 2019 The Royal Society of Chemistry.

语种： 英文

作者： Zhou, Zhi;Zhong, Yuan;Gu, Simin;Su, Yifeng;Xia, Mao;...

期刊： Journal of the American Ceramic Society,2019年102(4):1843-1851 ISSN：0002-7820

通讯作者： Zhou, Nan;Wang, Jing

作者机构： [Xia, Mao; Zhou, Nan; Wang, Jing; Su, Yifeng; Zhang, Yongli; Zhong, Yuan; Zhou, Zhi; Gu, Simin] Hunan Agr Univ, Coll Sci, Changsha, Hunan, Peoples R China.;[Xia, Mao] Cent S Univ, State Key Lab Powder Met, Changsha, Hunan, Peoples R China.;[Wang, Jing] Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Guangzhou, Guangdong, Peoples R China.

通讯机构： [Zhou, N; Wang, J] H;Hunan Agr Univ, Coll Sci, Changsha, Hunan, Peoples R China.

关键词： luminescence;phosphors;photoluminescence

摘要： In this paper, we introduced a bluish violet-emitting phosphor Ca3Al4ZnO10:Ti (IV) (CAZO:Ti4+) synthesized by high-temperature solid-state reaction. Upon 265nm excitation, a broad emission band spanned from 300nm to 500nm and centered at 370nm was observed. In addition, the effects of flux and charge compensation to photoluminescence properties of CAZO:Ti4+ were systematically investigated. The results show that 103% improvement of emission intensity was achieved when 1% H3BO3 flux was introduced and 32.8% enhancement of it for 2% Ca2+ vacancies doped as charge compensator. Moreover, the lifetimes, band gap energy, concentration quenching mechanism, as well as electron transition process of CAZO:Ti4+ were discussed. Due to the efficient broad bluish violet emission, this phosphor may find a potential application in mercury vapor-excited fluorescent lamp for plant growth. © 2018 The American Ceramic Society

语种： 英文

作者： Mao Xia;Li Yi-ran;Xiang Xiong;Wang Hu;Tang, Yi-wei;...

期刊： Journal of Alloys and Compounds,2019年800:116-124 ISSN：0925-8388

通讯作者： Zhi Zhou;Zhang, Hong-bo

作者机构： [Nan Zhou; Li Yi-ran; Zhi Zhou; Tang, Yi-wei; Mao Xia] Hunan Agr Univ, Coll Sci, Hunan Prov Engn Technol Res Ctr Opt Agr, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;[Xiang Xiong; Mao Xia; Wang Hu; Zhang, Hong-bo] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.

通讯机构： [Zhi Zhou] H;[Zhang, Hong-bo] C;Hunan Agr Univ, Coll Sci, Hunan Prov Engn Technol Res Ctr Opt Agr, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.

关键词： Amorphous carbon;Anodes;Barium titanate;Electric discharges;Electric potential;Electrochemical properties;Ions;Lithium;Nanotubes;Piezoelectric materials;Piezoelectricity;Silicon compounds;Silicon oxides;Transmissions;Amorphous carbon matrix;Charge-discharge process;Electrochemical performance;High-power lithium-ion batteries;Ion Mobility;Large volumes;Piezoelectric potential;Silicon monoxide;Lithium-ion batteries

摘要： Silicon monoxide (SiO)-based negative materials have attracted widespread attention due to the low working potential and high specific capacity. However, the large volume dilation (about 200%) is adverse to the electrochemical performance of battery during the charge-discharge process. To overcome the disadvantage of volume change, much effort has been paid to minimize the volume expansion. Unfortunately, the volume change is inescapable no matter how to modify the SiO-based materials. Therefore, utilizing the characteristics of volume expansion to improve the electrochemical properties of SiO-based material is the most desirable method. Piezoelectric materials can generate local piezoelectric field when suffer from the mechanical stress, which serves as a driving force to accelerate the transmission speed of Li ion, result in the improve of electrochemistry performance. In this work, SiO@C/BaTiO3/Carbon nanotubes composites are successfully synthesized and served as anode materials for lithium ion batteries (LIBs). The SiO and BaTiO3 are dispersed uniformly in amorphous carbon matrix, the large volume expansion of SiO can transfer to the BaTiO3 via the carbon matrix. When the BaTiO3 nanoparticles poled, the piezoelectric potential is generated, which can promote the mobility of Li ion. Carbon nanotubes provides the transmission channel to accelerate the diffusion of Li ion, which is benefited to the constitution and structure of composite, the SiO@C/BaTiO3/Carbon nanotubes exhibit excellent electrochemical performance with a high charge capacity of 711. 7 mAh g−1 and a high capacity retention of 92.4% after 200 cycles at 100 mA g−1. Experimental results suggest that the piezoelectric material BaTiO3 can enhance the electrochemical properties of SiO-based materials. © 2019 Elsevier B.V.

语种： 英文

作者： Wu, Xianbo;Liu, Longhai;Xia, Mao;Huang, Shengxiong;Zhou, Yue;...

期刊： Ceramics International,2019年45(8):9977-9985 ISSN：0272-8842

通讯作者： Zhou, Zhi;Zhou, Nan

作者机构： [Xia, Mao; Zhou, Zhi; Zhou, Nan; Huang, Shengxiong; Wu, Xianbo; Liu, Longhai; Zhou, Yue] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Huang, Shengxiong; Wu, Xianbo; Zhou, Zhi; Zhou, Nan; Liu, Longhai; Zhou, Yue] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao; Hu, Wang] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.

通讯机构： [Zhou, Z; Zhou, N] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Cation vacancies;Phosphor;Photoluminescence;Plant growth lighting;Ti 4+ -activated

摘要： Ti 4+ -activated zinc calcium aluminate phosphors, owing to their excellent luminescence properties, nontoxicity, environment friendliness and low price, have a certain prospect in the field of plant cultivation. In this study, we have successfully synthesized a series of Ca 14-y Al 10-x Zn 6-z O 35 :xTi 4+ (CAZO:Ti 4+ ) phosphors through a high-temperature solid-state method. Furthermore, the emission spectrum of CAZO:Ti 4+ located in bluish violet-emitting band, and has an emission peak at 378 nm upon the excitation of 268 nm due to the charge transfer of Ti 4+ -O 2- . Moreover, the luminescence intensity of as-synthetized phosphors can be improved by cation vacancies engineering to compensate for charge unbalance. Especially, the luminescence intensity could be further improved when the Ca 2+ vacancy is 0.35 mol or the Zn 2+ vacancy is 0.275 mol. Furthermore, the X-ray powder diffraction (XRD) analysis and crystal structure are checked and confirmed that the synthesized material is pure phase. The concentration quenching mechanism, FT-IR spectra, UV–vis absorption properties, lifetimes and electron transition process of Ca 14-y Al 10-x Zn 6-z O 35 : xTi 4+ were discussed in detail. From the above, the phosphor has a potential application for plant growth field due to its broad bluish violet emission. © 2019

语种： 英文