Controllable hydrothermal synthesis and photoluminescence properties of CaGd2(WO4)4:Eu3+ red-emitting phosphor |
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Authors: | Yangyi Xu Xiaohui Wang Yunge Wei Yuanxi Liu Guifang Li |
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Affiliation: | School of Advanced Materials and Nano Technology, Xidian University, Xi'an, China |
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Abstract: | CaGd2(WO4)4:Eu3+ phosphors with controllable morphology were synthesized via the hydrothermal method. The influences of pH value, reaction time and Eu3+ concentration on the crystal structure, morphology, and photoluminescence properties of CaGd2(WO4)4:Eu3+ were studied. The pure tetragonal structure CaGd2(WO4)4 is obtained when the pH value is 8 and 9. Furthermore, by altering the pH value of the reaction solution, the morphologies of the CaGd2(WO4)4:Eu3+ phosphors evolve from spindle-shaped grains to tetragonal plate-like grains and finally to aggregated bulk particles. Under the 394 nm excitation, the phosphors display a bright red emission corresponding to the characteristic 4f-4f transitions of Eu3+, and the intensity of emission peaks depends mainly on the pH value, the reaction time, and the Eu3+ concentration. The optimum photoluminescence performance is achieved for CaGd2-x(WO4)4:xEu3+ (x = 1) phosphor synthesized at pH = 8 under the reaction time of 16 h. Finally, the thermal stability of the phosphors is analyzed at different ambient temperatures. |
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Keywords: | hydrothermal synthesis photoluminescence red phosphors |
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