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Journal of luminescence v.202, 2018년, pp.414 - 419  

Abnormal photo-stimulated luminescence in Ba2Ga2GeO7: Tb3+, Bi3+

Tian, Shuyu (College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, PR China ) ; Zhao, Lei (School of Physics and Opto-Electronic Technology, Baoji University of Arts and Sciences, Baoji 721016, Shaanxi, PR China ) ; Chen, Wenbo (Engineering Research Center of New Energy Storage Devices and Applications, Chongqing University of Arts and Sciences, Chongqing 402160, PR China ) ; Liu, Zhichao (College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, PR China ) ; Fan, Xiaotong (College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, PR China ) ; Min, Qiuhong (College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, PR China ) ; Yu, Huan (College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, PR China ) ; Yu, Xue (College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, PR China ) ; Qiu, Jianbei (College of Mate ) ; Xu, Xuhui ;
  • 초록  

    Abstract A novel green-emitting phosphor Ba 2 Ga 2 GeO 7 : Tb 3+ , Bi 3+ was successfully synthesized by solid-state reaction. The photoluminescence (PL), photo-stimulated luminescence (PSL) and long persistent luminescence (LPL) were investigated in detail. After pre-irradiation upon UV light, the PSL spectrum of Ba 2 Ga 2 GeO 7 : Tb 3+ , Bi 3+ exhibits peaks centered at 493, 547, 589, and 627 nm under excitation at 980 nm, ascribed to the transitions of 5 D 4 → 7 F j (j = 3, 4, 5, 6) by tunneling process. While PL spectrum exhibits peaks related to the transitions of 5 D 3 , 5 D 4 → 7 F j (j = 3, 4, 5, 6). Thermo-luminescence (TL) curve shows that a large amount of traps can be in Ba 2 Ga 2 GeO 7 : Tb 3+ by induced Bi 3+ , leading to the improvement of PSL spectra performance. These findings open a vista of possible avenues for the understanding of the PSL process.


  • 주제어

    Photo-stimulated luminescence .   Luminescence .   Traps .   Tunneling .   Phosphors.  

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