Flux and concentration effect on Eu3+ doped Gd2(MoO4)3 phosphor
来源期刊：JOURNAL OF RARE EARTHS2008年第2期
论文作者：ZHANG Xiangqing SUN Jiashi CHENG Lihong YU Tao PENG Yong ZHONG Haiyang ZHAO Xiaoxia
Key words：Eu; X-ray diffraction; luminescence; phosphors; crystal structure; rare earths;
Abstract: A novel red emitting phosphor Gd2(MoO4)3:Eu3+ was prepared by solid reaction, using Gd2O3, Eu2O3 and WO3 as starting materials and NH4F as flux. The effects of flux content and Eu3+ concentration on the crystal structure, morphology and luminescent properties were investigated using XRD, SEM and fluorescent spectrum measurement. The XRD patterns showed that the resultants had the monoclinic structure. With the increase in flux amount, their crystallization significantly improved. The SEM images indicated that the mean size of the phosphor particles was around 2 μm, and agglomeration of the phosphor particles appeared while introducing higher flux amount. The excitation spectra exhibited more intense f-f transitions originating from ground state 7F0 to upper states 5L6 and 5D2 than the charge transfer band. The concentration quenching of Eu3+ emission indicated that energy transfer from Eu3+ to molybdate host existed even at lower Eu3+ concentration.
ZHANG Xiangqing1，SUN Jiashi1，CHENG Lihong1，YU Tao1，PENG Yong1，ZHONG Haiyang1，ZHAO Xiaoxia2
(1.Department of Physics, Dalian Maritime University, Dalian 116026, China;
2.Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China)
Abstract:A novel red emitting phosphor Gd2(MoO4)3:Eu3+ was prepared by solid reaction, using Gd2O3, Eu2O3 and WO3 as starting materials and NH4F as flux. The effects of flux content and Eu3+ concentration on the crystal structure, morphology and luminescent properties were investigated using XRD, SEM and fluorescent spectrum measurement. The XRD patterns showed that the resultants had the monoclinic structure. With the increase in flux amount, their crystallization significantly improved. The SEM images indicated that the mean size of the phosphor particles was around 2 μm, and agglomeration of the phosphor particles appeared while introducing higher flux amount. The excitation spectra exhibited more intense f-f transitions originating from ground state 7F0 to upper states 5L6 and 5D2 than the charge transfer band. The concentration quenching of Eu3+ emission indicated that energy transfer from Eu3+ to molybdate host existed even at lower Eu3+ concentration.
Key words:Eu; X-ray diffraction; luminescence; phosphors; crystal structure; rare earths;
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