Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (08): 2001-2008.doi: 10.3866/PKU.WHXB20110732

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Effect of Defects on the Luminescence and Scintillation Property of YLuAG:Ce Phosphors Obtained by Different Synthetic Routes

ZHANG Kong1,2, LIU Qian1, SU Xiao-Bin1,2, ZHONG Hong-Mei1, SHI Yun3, PAN Yu-Bai3   

  1. 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
    3. Key Laboratory of Transparent Opto-functional Inorganic Material, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China
  • Received:2011-03-21 Revised:2011-05-22 Published:2011-07-19
  • Contact: LIU Qian E-mail:qianliu@sunm.shcnc.ac.cn
  • Supported by:

    The project was supported by the National High Technology Research and Development Program of China (863) (2009AA03Z437).

Abstract:

Optimized YLuAG:Ce (Y0.600Lu2.364Al5O12:Ce0.036) phosphors were synthesized by three methods: nitrate-pyrolysis (NP), co-precipitation (CP) with ammonium hydrogen carbonate, and citrate-combustion (CC). Differences in the reaction process, crystallization, morphologies, photoluminescence (PL), and scintillant performance of the three kinds of phosphors were revealed and are explained using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), PL and thermoluminescence (TL) measurements and observations. Obvious differences in the emission bands and decay times of the different phosphors prepared were found and the differences were mostly caused by the defects either on the surface or in the bulk phase of the YLuAG:Ce phosphors powders. The recorded thermoluminescence spectra of the three kinds of phosphors show a different intensity and main glow peak positions. Additionally, the thermoluminescence spectra show that the synthesis methods induce defects in the phosphors. The defects result in strong trapping process effects and a high probability of radiative recombination between the trapped holes and electrons in the final phosphor powders that were obtained using the different synthesis routes.

Key words: YLuAG:Ce phosphor, Synthesis, Luminescence, Decay time, Defect

MSC2000: 

  • O644