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《Journal of The Chinese Rare Earth Society》 2004-02
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Long Afterglow Luminescence Property of Cd_2Ge_7O_(16)∶Pr~(3+)

Yi Shoujun, Liu Yingliang~*, Zhang Jingxian, Yuan Dingsheng, Rong Jianhua, Huang Langhuan (Chemistry Department of Jinan University, Guangzhou 510632, China)  
Cd_2Ge_7O_(16)∶Pr~(3+) were prepared by the high temperature solid state method. The material is a single phase. From the emission spectra and excitation spectra of Cd_2Ge_7O_(16)∶Pr~(3+) and Cd_2Ge_7O_(16), it is seen that luminescence of Cd_2Ge_7O_(16)∶Pr~(3+) originates in Cd_2Ge_7O_(16) and Pr~(3+) separately. It is also shown that luminescence of Cd_2Ge_7O_(16)∶Pr~(3+) is due to the 4f-4f transition of Pr~(3+) ion and the transition of Cd_2Ge_7O_(16) from conductive band to trap level. Long afterglow property of Cd_2Ge_7O_(16)∶Pr~(3+) is due to the electron trap and hole trap of Cd_2Ge_7O_(16)∶Pr~(3+). The electron trap can capture electron and the hole trap can also capture hole. So afterglow luminescence appears. Afterglow mechanism was described.
【Fund】: 国家自然科学基金资助项目(59982003 20171018);; 广东省自然科学基金资助项目(36706 013201)
【CateGory Index】: O482.31;O614.33
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