Yellow lighting upconversion from Yb³⁺/Ho³⁺ co-doped CaMoO₄

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• 作者：Jun Ho Chung^a ; Jeong Ho Ryu^b ; Sang Yeop Lee^a ; Jeong Hoon Lee^a ; Bong Geun Choi^a ; Kwang Bo Shim^a ; ^{kbshim@hanyang.ac.kr} ; ^{kbshim0214@gmail.com}
• 关键词：A. Optical materials ; D. Luminescence ; D. Optical properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：August, 2012
• 卷：47
• 期：8
• 页码：1991-1995
• 文件大小：877 K

摘要

Yellow upconversion (UC) luminescence is observed in Ho³⁺/Yb³⁺ co-doped CaMoO₄ synthesized by complex citrate-gel method. Under 980 nm excitation, Ho³⁺/Yb³⁺ co-doped CaMoO₄ exhibited yellow emission based on green emission near 543 nm generated by ⁴F₄, ⁵S₂ 鈫?#xA0;⁵I8 transition and strong red emission around 656 nm generated by ⁵F₅ 鈫?#xA0;⁵I₈ transition, which are assigned to the intra 4f transitions of Ho³⁺ ions. The optimum doping concentration of Ho³⁺ and Yb³⁺ was investigated for highest upconversion luminescence. Based on pump power dependence, upconversion mechanism of Ho³⁺/Yb³⁺ co-doped CaMoO₄ was studied in detail.