Study on the Enhanced Luminescence of GdTaO4∶Eu3+ Phosphors by Li+ Codopant
FU Shang-yi, GU Mu*, LIU Xiao-lin, NI Chen, LIU Bo, HUANG Shi-ming
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Department of Bohr Solid Physics, Tongji University, Shanghai 200092, China
Abstract：The XRD, emission and IR transmission spectra of Li-doped GdTaO4∶Eu3+ phosphors were measured. Judd-Ofelt theory was applied, and the intensity parameters Ω2 of Eu3+ for optical transition were calculated. The results show that Li+ codoping can enhance the luminescence intensity of GdTaO4∶Eu3+. The intensity can be improved up to 1.7 and 1.5 times, respectively, when x=0.06 and 0.10. The phenomenon results not from the assumption that Li+ codopant can reduce the crystal symmetry of GdTaO4∶Eu3+ so as to relax the parity forbidden transition, but from the flux effect of Li+ codopant which can improve the crystallinity of GdTaO4∶Eu3+ and suppress the Gd2O3 and Ta2O5 hetero phases. Gd0.92-xLixTaO4∶Eu3+0.08 has not only quite a good crystallinity but also less Gd2O3 and Ta2O5 hetero phases when x=0.06 or 0.10. Therefore, their luminescence intensities can be improved evidently.
傅尚怡，顾 牡*，刘小林，倪 晨，刘 波，黄世明 . Li+共掺杂GdTaO4∶Eu3+发光增强效应的研究 [J]. 光谱学与光谱分析, 2010, 30(09): 2317-2320.
FU Shang-yi, GU Mu*, LIU Xiao-lin, NI Chen, LIU Bo, HUANG Shi-ming . Study on the Enhanced Luminescence of GdTaO4∶Eu3+ Phosphors by Li+ Codopant . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(09): 2317-2320.
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