Upconversion emission colour modulation of Y sub(2)O sub(2)S: Yb, Er under 1.55 [mu]m and 980 nm excitation

• Published in: Journal of alloys and compounds Vol. 587; pp. 344 - 348
• Main Authors: Wang, Hong, Xing, Mingming, Luo, Xixian, Zhou, Xiaolin, Fu, Yao, Jiang, Tao, Peng, Yong, Ma, Yunbei, Duan, Xiaolong
• Format: Journal Article
• Language: English
• Published: 25.02.2014
• Subjects: Color; Colour; Emission; Erbium; Excitation; Luminescence; Modulation; Upconversion
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2013.10.163

The upconversion luminescence of Y sub(2)O sub(2)S: 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 Y sub(2)O sub(3): 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 Er super(3)+ ion concentration or 1550 nm excitation power. Y sub(2)O sub(2)S: 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.