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Mechanism of upconversion emission enhancement in Y_3Al_5O_(12):Er^(3+)/Li^+ powders

Mechanism of upconversion emission enhancement in Y_3Al_5O_(12):Er^(3+)/Li^+ powders
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摘要 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. 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.
作者 杨明珠 隋郁 牟海维 吕树臣 王先杰 吕天全
机构地区 College of Electronic Science Center for Condensed Matter Science and Technology(CCMST) International Center for Materials Physics Department of Physics
出处 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第11期1022-1025,共4页 稀土学报（英文版）
基金 Project supported by the National Natural Science Foundation of China (50672019 and 10804024) the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry the Fundamental Research Funds for the Central Universities (HIT.NSRIF.2009056)
关键词 LUMINESCENCE optical materials and properties sol-gel preparation NANOMATERIALS rare earths luminescence optical materials and properties sol-gel preparation nanomaterials rare earths
分类号 TB30 [一般工业技术—材料科学与工程]
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参考文献13

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共引文献6

Journal of Rare Earths
2011年 第11期

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