The luminescence characteristics of europium-ion activated Y3Al5O12 (YAG:Eu3+) phosphors prepared via a sol-gel process were investigated in the vacuum ultraviolet (VUV) region using synchrotron radiation. An intense red emission due to D05→F17 transition of Eu3+ ions is produced under excitation at 147nm. The intensity of this emission significantly increases with calcination temperature and activator concentration. Deconvolution of the VUV excitation spectra reveals the presence of several peaks that can be accordingly assigned to the charge transfer band, exciton transition bands, and 4f6→4f5-5d transition band. The excitation spectra of YAG:Eu3+ phosphors vary markedly with the phosphor particle size. With a decrease in the particle size, the peak positions of the charge transfer band and exciton transition bands shift towards low energy region, and the f→d transition band of Eu3+ ions shift towards the high energy region. The results imply that the excitation behavior of the sol-gel derived YAG:Eu3+ phosphors can be tailored by controlling the calcination temperature and the particle size.
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Lu et al. (2006) studied this question.
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