光谱学与光谱分析 |
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Luminescence Properties of Eu, Dy Doped BaAl12O19 Long Afterglow Phosphors |
XIONG Yi, WANG Yin-hai*, HU Zheng-fa, LI Ya, PENG Tie-qiu, ZHAO Hui |
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China |
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Abstract Long afterglow phosphors BaAl12O19∶Eu2+/Eu3+, Dy3+ were synthesized by high temperature solid state method under different atmosphere. X-ray powder diffraction (XRD) shows that pure BaAl12O19 phase structure was obtained and the doping ions Eu2+/Eu3+,Dy3+ didn’t change the phase structure. By comparison, the authors found that the doping ions Eu2+/Eu3+,Dy3+ caused the XRD diffraction peaks moving to the high angle slightly which displayed that the inter-planar crystal spacing was changed via Eu and Dy replacing Ba lattice in BaAl12O19. Emission spectra show that all the samples prepared under different conditions exhibit the 4f65d1→4f7 broadband transition which is the features emission of Eu2+ and the existence of the features emission of Eu2+ in the sample synthesized in air indicates that Eu3+ ions can be reduced to divalent state in air. The doping ions Dy3+ can not only enhance the luminous intensity of samples but also make the samples to obtain long afterglow characteristics. The afterglow decay and thermoluminescence studies of the Eu, Dy co-doped sample synthesized under reducing atmosphere reveal that the sample has good long afterglow properties at room temperature and high temperature.
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Received: 2011-06-22
Accepted: 2011-12-30
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Corresponding Authors:
WANG Yin-hai
E-mail: yhwang@gdut.edu.cn
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