Journal of Inorganic Materials ›› 2015, Vol. 30 ›› Issue (2): 177-182.doi: 10.15541/jim20140254

• Orginal Article • Previous Articles     Next Articles

(Y, Lu)AG:Ce Phosphors Synthesized by Stearate Melting Method and Their Fluorescence Properties

Jin-Sheng LI(), Xu-Dong SUN(), Xiao-Dong LI, Shao-Hong LIU, Qi ZHU   

  1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China
  • Received:2014-05-15 Revised:2014-06-19 Online:2015-02-20 Published:2015-01-27
  • About author:LI Jin-Sheng. E-mail:jinsheng1986@163.com
  • Supported by:
    National Natural Science Foundation of China (50990303, 51102040);Fundamental Research Funds for the Central Universities (Grants N120610001)

Abstract:

[(Y1-xLux)1-yCey]3Al5O12 (x=0-0.5, y=0.005-0.03) garnet powders were prepared by a novel stearate melting method. The phosphor powders were analyzed by XRD, SEM, BET and PL-PLE. The results show that phase-pure garnet can be obtained upon calcination at a relatively low temperature of 800℃, without involvement of YAlO3 (YAP) and Y4Al2O9 (YAM) intermediate phases. The resultant [(Y1-xLux)1-yCey]3Al5O12 phosphor powders are well dispersed, and show the highest emission at 544 nm under excitation wavelength at 455 nm. The emission intensity increases with increasing calcination temperature, due to improved crystallinity of the powder and removal of surface defects at high temperatures. The quenching concentration of Ce3+ is found to be 1.5% and the quenching mechanism is proposed to be Ce-Ce interactions and lattice defects. PL band of the phosphor red shifts with the increase of Ce3+ content, while the strongest excitation and emission bands are blue shift with increasing Lu3+ doping, due to combination effects of centroid shift and crystal field splitting of the Ce3+ 5d energy levels.

Key words: YAG:Ce3+, Lu3+ doping, luminescence properties, energy centroid, crystal field splitting

CLC Number: 

  • TB34