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Yang J.,Guizhou Normal University | Yang J.,Key Laboratory for Functional Materials Chemistry of Guizhou Province | Zhu L.,Guizhou Normal University | Shen J.,Guizhou Normal University | Duan Z.,Guizhou Normal University
Bandaoti Guangdian/Semiconductor Optoelectronics | Year: 2014

The visible-light responsive SO4 2-/Bi2O3 solid superacid catalyst was prepared via combining hydrothermal technology with a H2SO4 dipping process. Then the crystal structures, thermal and optical properties of the as-prepared samples were investigated by XRD, TG-DTA and UV-Vis. The effects of the concentration of H2SO4 solution, time of dipping treatment, and the heat treatment temperature were investigated. The results of XRD show that the as-prepared samples were the mixture of α-Bi2O3, Bi2O4 and Bi2O2CO3 crystals, and the H2SO4 dipping treatment conditions have significant influence on the photocatalytic property of the as-prepared products. When the preparation conditions are chosen as: concentration of H2SO4 of 0.5 mol·L-1, dipping time of 75 min and heat treatment temperature of 700℃ for 4 h, the photocatalytic decolourization ratio can reach 93.1%. Source


Yang J.-Y.,Guizhou Normal University | Yang J.-Y.,Key Laboratory for Functional Materials Chemistry of Guizhou Province | Luo L.,Guizhou Normal University | Su Y.-C.,Central South University | Shen J.,Guizhou Normal University
Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy | Year: 2014

Sm3+ doped YPO4 nanocrystals were successfully synthesized via a polyacrylamide gel route. The crystal structure, particle size, morphology, and optical properties of the as-synthesized products were investigated by XRD, SEM, FT-IR and PL. The results reveal that the as-prepared samples have single xenotime structure with particle sizes about 20 nm. The photoluminescence spectra of Sm3+ doped YPO4 nanophosphors show a characteristic orange-red luminescence of Sm3+ under 405 nm light excitation. Furthermore, the concentration quenching was observed when the Sm3+ doping content was over 2%, and the concentration quenching mechanism was verified as dipole-dipole interaction. Source


Jia X.-H.,Guizhou Normal University | Jia X.-H.,Key Laboratory for Functional Materials Chemistry of Guizhou Province | Zeng X.-D.,Guizhou Normal University | Zeng X.-D.,Key Laboratory for Functional Materials Chemistry of Guizhou Province | And 3 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

LaP3O9:Eu3+ phosphors were synthesized by polyacrylamide gel method. The crystal structure and optical properties of the as-synthesized samples were investigated by XRD, FT-IR and FL. The influences of synthesis conditions and Eu3+ doping content on the crystal structure and optical properties of the as-prepared samples were also discussed. The results exhibit that single-phase orthorhombic structure LaP3O9:Eu3+ crystals with space group C2221 can be obtained by polyacrylamide gel method. The photoluminescence spectra show characteristic orange-red emission of Eu3+ under ultraviolet light excitation. The doping content of Eu3+ plays a key role in the emission intensities of LaP3O9:Eu3+ crystals. The concentration quenching phenomenon can not be observed even though the doping content reaches 10% (mole fraction). The results reveal that the synthesis conditions have significant influence on the optical properties of the samples. When the calcination temperature is 850℃, calcination time is 6 h and pH is 4, the as-prepared sample displays excellent luminescence properties. ©, 2015, Central South University of Technology. All right reserved. Source


Yang J.,Guizhou Normal University | Yang J.,Key Laboratory for Functional Materials Chemistry of Guizhou Province | Jia X.,Guizhou Normal University | Jia X.,Key Laboratory for Functional Materials Chemistry of Guizhou Province | And 5 more authors.
Journal of Materials Science | Year: 2015

Pure phase of LaP3O9Eu3+ phosphors with orthorhombic structure was successfully synthesized by a polyacrylamide gel process. The crystal structure, thermal behavior, and optical properties of the as-synthesized samples were investigated by XRD, TG-DTA, FT-IR, and PL. The effects of some synthesis conditions on the structure and properties of samples were also discussed. The results reveal that the annealing temperature and the ratio of (La+Eu) to P in precursor solutions play a key role in determining the structure and luminescence properties of products. The single-phase orthorhombic structure LaP3O9:Eu3+ phosphors can be obtained by annealing at 750–850 °C. The LaP3O9:Eu3+ phosphors emit a dominating and intense line at 618 nm, and exhibit improved photoluminescence properties compared with the samples of LaPO4:Eu3+ crystals. The concentration quenching effect can be observed with increasing Eu3+ concentration over 40 at.%. © 2015, Springer Science+Business Media New York. Source

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