Selective enhancement of green upconversion emissions of Er³⁺:Yb₃Al₅O₁₂ nanocrystals by high excited state energy transfer with Yb³⁺-Mn²⁺ dimer sensitizing

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• 作者：Z.P. Li^a ; ^b ; B. Dong^b ; ^{dong@dlnu.edu.cn} ; Y.Y. He^b ; B.S Cao^b ; Z.Q. Feng^b
• 关键词：Er3+&ndash ; Mn2+ ; Yb3Al5O12 ; Upconversion emission ; Energy transfer
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：July, 2012
• 卷：132
• 期：7
• 页码：1646-1648
• 文件大小：336 K

摘要

An innovative upconversion (UC) emissions route of Er³⁺ by Yb³⁺-Mn²⁺ dimer sensitizing in Er³⁺-Mn²⁺:Yb₃Al₅O₁₂ (YbAG) nanocrystals is reported here, which resulted in the selective enhancement of green UC emission and suppression of red UC emission by a 976 nm laser diode excitation. By codoping of Mn²⁺, the green UC emission intensity increased about 260 times, while the red UC emission intensity decreased about 20 times than that of Er³⁺:YbAG nanocrystals. It indicates that the green enhancement and red suppression arise from the high excited state energy transfer with |²F_7/2, ⁴T_1g> (Yb³⁺-Mn²⁺ dimer) to the ⁴F_7/2 (Er³⁺), which partly decreases the nonradiative processes happened in the lower levels of Er³⁺. The proposed sensitizing route here may constitute a promising step to realize high-efficient UC emissions of rare-earth ions doped oxides and significantly extend their scope of applications.