Upconversion white-light emission in Houp>3+up>/Ybup>3+up>/Tmup>3+up> codoped LiNbO₃ polycrystals

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• 作者：Lili Xingup>aup> ; Rui Wangup>aup>up> ; up>up>wangrui001@hit.edu.cnup> ; Wei Xuup>bup> ; Yannan Qianup>aup> ; Yanling Xuup>aup> ; Chunhui Yangup>aup> ; Xinrong Liuup>aup>
• 关键词：Ho3+/Yb3+/Tm3+/LiNbO3 ; Upconversion ; White-light
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：June, 2012
• 卷：132
• 期：6
• 页码：1568-1574
• 文件大小：1015 K

摘要

Houp>3+up>/Ybup>3+up>/Tmup>3+up> codoped LiNbO₃ polycrystals exhibiting upconversion white-light under 980 nm excitation have been successfully fabricated by the high temperature solid-state reaction method. CIE coordinate of the Houp>3+up>/Ybup>3+up>/Tmup>3+up>/LiNbO₃ polycrystal is (0.34, 0.35), which is very close to the standard equal energy white-light illuminate (0.33, 0.33). Efficient green, red, and blue upconversion emissions have been observed. The luminescent decay dynamics are studied, and rate equations for the blue, green, and red emissions are set up to analyze the upconversion luminescence mechanism. The present results demonstrate that the competition between the linear decay and the upconversion process for the depletion of the intermediate excited states plays an important role in upconversion mechanism. The LiNbO₃ with upconversion white-light will be a promising luminous material.