| 光谱学与光谱分析 |
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| Structure and Luminescence Properties of MgGa2O4∶Cr3+ with Zn Substituted for Mg |
| ZHANG Wan-xin, WANG Yin-hai*, LI Hai-ling, WANG Xian-sheng, ZHAO Hui |
| School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China |
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Abstract A series of red long afterglow phosphors with composition ZnxMg(1-x)Ga2O4∶Cr3+(x=0，0.2，0.6，0.8，1.0)were synthesized by a high temperature solid-state reaction method. The X-ray diffraction studies show that the phase of the phosphors is face-centered cubic structure. Photoluminescence spectra show that the red emission of Cr3+ originated from the transition of 2E—4A2. Due to the large overlap between absorption band of Cr3+ and emission band of the host. Cr3+ could obtain the excitation energy from the host via the effective energy transfer. The afterglow decay characteristics show that the phosphor samples with different Zn contents have different afterglow time and the afterglow time also changes with the value of x. The measurement of thermoluminescence reveals that the trap depth of the phosphor samples with different Zn contents is different. The samples with deeper traps have longer afterglow time.
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Received: 2012-06-26
Accepted: 2012-09-25
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Corresponding Authors:
WANG Yin-hai
E-mail: yhwang@gdut.edu.cn
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