Mechanism of upconversion emission enhancement in Y_3Al_5O_（12）：Er~（3＋）/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 em...

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Published inJournal of rare earths Vol. 29; no. 11; pp. 1022 - 1025
Main Author 杨明珠 隋郁 牟海维 侣树臣 王先杰 吕天全
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2011
Subjects
luminescence
nanomaterials
optical materials and properties
rare earths
sol-gel preparation
X射线衍射
Y3Al5O12
YAG激光
上转换发光
发射光谱
机制
粉末制备
系统调查
optical materials and properties
nanomaterials
luminescence
sol-gel preparation
rare earths
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Summary: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.
Bibliography:11-2788/TF
luminescence; optical materials and properties; sol-gel preparation; nanomaterials; rare earths
YANG Mingzhu ,SUI Yu ,MU Haiwei ,Lu Shuchen ,WANG Xianjie ,L Tianquan （1.College of Electronic Science,Northeast Petroleum University,Daqing 163000,China;2.Center for Condensed Matter Science and Technology（CCMST）,Department of Physics,Harbin Institute of Technology,Harbin 150001,China;3.International Center for Materials Physics,Academia Sinica,Shenyang 110015,China;4.Department of Physics,Harbin Normal University,Harbin 150001,China）
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.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(10)60590-X