Luminescence and energy transfer in phosphor LiAl₅O₈: Ce³⁺, Dy³⁺

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• 作者：Zhongfei Mu^a ; ^b ; Yihua Hu^a ; ^{huyh@gdut.edu.cn} ; Li Chen^a ; Xiaojuan Wang^a ; Guifang Ju^a
• 关键词：LiAl5O8 ; Ce3+ ; Dy3+ ; Co-doping ; Energy transfer
• 刊名：Radiation Measurements
• 出版年：2012
• 期刊代码：71_13504487
• 类别：ce
• 出版时间：June, 2012
• 卷：47
• 期：6
• 页码：426-429
• 文件大小：588 K

摘要

Ce³⁺ and Dy³⁺-doped LiAl₅O₈ were synthesized in the present study. The luminescence properties of Ce³⁺ and Dy³⁺, and the energy transfer from Ce³⁺ to Dy³⁺ were investigated. The Ce³⁺ species in LiAl₅O₈ emit one broad band that peaks at 351聽nm under the excitation of ultraviolet light, which is attributed to the 5d-4f transitions of Ce³⁺. The luminescence of Dy³⁺ in singly doped LiAl₅O₈ can not be detected due to its low oscillator strength. However, Dy³⁺ emit intense blue (477聽nm) and yellow (569聽nm) light after the introduction of Ce³⁺. This phenomenon demonstrates that there exists effective energy transfer from Ce³⁺ to Dy³⁺, which occurs because the emission spectrum of Ce³⁺ perfectly overlays the excitation spectrum of Dy³⁺. The energy transfer from Ce³⁺ to Dy³⁺ is performed through dipole-dipole interactions. The experimental results show that LiAl₅O₈ co-doped with Ce³⁺ and Dy³⁺ can be a potential two-band (blue and yellow) phosphor.