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《Chinese Journal of Luminescence》 2017-09
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Photoluminescence and Long-lasting Phosphorescence Characteristics of (Zn_(1-x),Mg_x)_2GeO_4∶Mn~(2+)

GUO Cheng;CONG Yan;DONG Bin;ZHU Zi-mao;WANG Zi-wen;ZHANG Zhen;LI Bin;School of Physics & Materials Engineering,Dalian Nationalities University;State Key Laboratory of Luminescence and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences;  
(Zn_(1-x),Mg_x)_2GeO_4∶Mn~(2+)( 0≤x≤0. 25) green phosphors were synthesized by the conventional solid-state reaction,and the effect of Mg incorporation on photoluminescence( PL) and long-lasting phosphorescence( LLP) characteristics of Zn_2GeO_4∶Mn~(2+) was systematically studied.The emission spectrum shows a broad emission band centered at 533 nm,which can be assigned to the ~4T_1(~4G) →~6A_1(~6S) transitions of Mn~(2+) ion. The emission intensity can be increased by the resonant transfer from a subbandgap state in the host to Mn~(2+),and the PLE spectra of(Zn_(1-x),Mg_x)_2GeO_4∶Mn~(2+) exhibit a blue shift with the increasing of Mg concentration. Thermoluminescence( TL) spectra indicate that the introduction of Mg into the host deepened the Vo traps,resulting inthe enhanced phosphorescence of Mn~(2+). The possible mechanism of the PL and LLP was discussed based on the PL and TL results.
【Fund】: 国家自然科学基金(11274057 11474046);; 大连市金州新区科技计划(2012-A1-051);; 中央高校基本科研业务费专项资金(DC201502080302 DC201502080203 DCPY2016026);; 大连民族大学大学生创新创业训练计划(G201612026049);; 大连民族大学“太阳鸟”学生科研项目资助~~
【CateGory Index】: O482.31;TQ422
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