Upconversion emission colour modulation of Y₂O₂S: Yb, Er under 1.55 渭m and 980 nm excitation

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• 作者：Hong Wang ; Mingming Xing ; Xixian Luo ; Xiaolin Zhou ; Yao Fu ; Tao Jiang ; Yong Peng ; Yunbei Ma ; Xiaolong Duan
• 关键词：Upconversion luminescence ; Oxysulphide ; 1.55  ; 渭m Excitation ; Colour modulation
• 刊名：Journal of Alloys and Compounds
• 出版年：25 February, 2014
• 年：2014
• 卷：587
• 期：Complete
• 页码：344-348
• 全文大小：1479 K

文摘

The upconversion luminescence of Y₂O₂S: Yb, Er under 1550 nm pumping has been investigated. It presents excellent red emission under 1550 nm excitation with an upconversion brightness of more than twice that of Y₂O₃: Yb, Er under 980 nm excitation. Upconversion luminescence spectrum shows that the strongest NIR peak is situated at 1020 nm, the second strong peak is red emission centred at 690 nm, and the third strong peak is a green band. The red/green fluorescence branching ratio dramatically decreases with an increase in the Er³⁺ ion concentration or 1550 nm excitation power. Y₂O₂S: Yb, Er presents green upconversion luminescence under 980 nm excitation. Therefore, red and green two-tone upconversion colour can be created by 1550 and 980 nm excitation, respectively. Moreover, a very wide range of emission colour can be continuously tuned by the joint contribution of altered composition and excitation power.