A single-phased white-emitting Ca2Ga2GeO7：Dy3＋ phosphor with different charge compensation ions  

作　　者：周俊鹤 余雪 王婷 周大成 邱建备 

机构地区：[1]College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China [2]Key Lab of Advanced Materialsin Rare & Precious and Nonferrous Metals (Kunming University of Science and Technology), Ministry of Education, Kunming 650093, China

出　　处：《Journal of Rare Earths》2017年第3期241-246,共6页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51272097,61265004,61307111);the National and Science Fund from Yunnan Province Ministry of Education(KKJA201432042)

摘　　要：A novel white-emitting Ca_2Ga_2GeO_7：Dy^（3＋） phosphor was synthesized via a high-temperature solid-state reaction.The crystal phase was analyzed by X-ray diffraction（XRD）,and the photoluminescence（PL） properties were studied by luminescence spectra and fluorescence decay curves.Under the excitation of 347 nm,the obtained phosphor exhibited strong emission in the blue region peaked at 478 nm,yellow at 574 nm and a weak red emission band at 665 nm,corresponding to the characteristic transitions of ~4F_（9/2）to ~6H_（15/2）,~6H_（13/2） and ~6H_（11/2） of Dy^（3＋）,respectively.By varying the doping concentration of Dy^（3＋）,tunable colors from blue-white to yellow-white were obtained in the phosphors.Besides,by codoping charge compensators（Li~＋,Na~＋,K~＋ and Ga^（3＋）） in Ca_2Ga_2GeO_7：Dy^（3＋）,the optimum CE color coordinate and PL intensity were obtained in Ca_2Ga_2GeO_7：Dy^（3＋）,K~＋.Accordingly,the PL mechanism of Ca_2Ga_2GeO_7：Dy^（3＋） was discussed briefly.A novel white-emitting Ca_2Ga_2GeO_7：Dy^（3＋） phosphor was synthesized via a high-temperature solid-state reaction.The crystal phase was analyzed by X-ray diffraction（XRD）,and the photoluminescence（PL） properties were studied by luminescence spectra and fluorescence decay curves.Under the excitation of 347 nm,the obtained phosphor exhibited strong emission in the blue region peaked at 478 nm,yellow at 574 nm and a weak red emission band at 665 nm,corresponding to the characteristic transitions of ~4F_（9/2）to ~6H_（15/2）,~6H_（13/2） and ~6H_（11/2） of Dy^（3＋）,respectively.By varying the doping concentration of Dy^（3＋）,tunable colors from blue-white to yellow-white were obtained in the phosphors.Besides,by codoping charge compensators（Li~＋,Na~＋,K~＋ and Ga^（3＋）） in Ca_2Ga_2GeO_7：Dy^（3＋）,the optimum CE color coordinate and PL intensity were obtained in Ca_2Ga_2GeO_7：Dy^（3＋）,K~＋.Accordingly,the PL mechanism of Ca_2Ga_2GeO_7：Dy^（3＋） was discussed briefly.

关 键 词：PHOSPHOR LUMINESCENCE crystal structure defects rare earths 

分 类 号：TQ422[化学工程]