کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1262436 | 971866 | 2011 | 4 صفحه PDF | دانلود رایگان |
Er3+ and Li+ codoped Y3Al5O12 (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 Er3+ 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 Er3+, and the other was the decrease in the amount of CO32− and OH− groups. Our results revealed that the latter was the dominant mechanism of the upconversion intensity enhancement in the YAG:Er3+/Li+ powders.
Journal: Journal of Rare Earths - Volume 29, Issue 11, November 2011, Pages 1022-1025