Abstract
Er 3+ and Li + codoped Y 3Al 5O 12 (YAG) powders were prepared for a systematic investigation of their upconversion emissions. X-ray diffraction (XRD), upconversion emission spectra, pump power dependence, FT-IR spectra and decay time were studied to characterize the samples. With Li + doping, the upconversion emission intensity of Er 3+ doped YAG powders was obviously enhanced, accompanied with an increase in the ratio of green to red intensity. The enhancement of emission intensity could be attributed to two mechanisms: one was the distortion of local crystal field around Er 3+, and the other was the decrease in the amount of CO 3 2− and OH − groups. Our results revealed that the latter was the dominant mechanism of the upconversion intensity enhancement in the YAG:Er 3+/Li + powders.
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