Laser-diode-excited Blue Upconversion in Tm3+/Yb3+-codoped TeO2-Ga2O3-R2O (R=Li, Na, K) Glasses期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Laser-diode-excited Blue Upconversion in Tm3+/Yb3+-codoped TeO2-Ga2O3-R2O (R=Li, Na, K) Glasses

Authors:	Chun Zhao Qinyuan Zhang Gangfeng Yang Zhonghong Jiang

Institution:	(1) Key Laboratory of Special Functional Materials of Ministry of Education and Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China;(2) College of Applied Physics, South China University of Technology, Guangzhou, 510641, China

Abstract:	This paper reports on intense blue upconversion in Tm³⁺/Yb³⁺ codoped TeO₂-Ga₂O₃-R₂O(R=Li, Na, K) glasses upon excitation with commercial available laser diode (LD). Effects of alkali ions on the Raman spectra, thermal stability and spectroscopic properties of the tellurite-gallium glasses have also been investigated. Energy transfer and the involved upconversion mechanisms have been discussed. Intense blue upconversion emission centered at 476 nm along with a weak red emission at 650 nm has been observed upon excitation of 977 nm LD, assigned to the transitions of ${}^{1}G_{4} \to {}^{3}{\text{H}}_{{\text{6}}}$ , and ${}^{1}G_{4} \to {}^{3}{\text{H}}_{{\text{4}}}$ and/or ${}^{3}{\text{F}}_{{2,3}} \to {}^{3}{\text{H}}_{{\text{6}}}$ of Tm³⁺, respectively. The blue upconversion intensity has a cubelike dependence on incident pump laser power, indicating a three-photon process. However, a quadratic dependence of the 476 nm upconversion intensity on the incident pump laser power has been observed when samples under excitation of 808 nm LD due to a two-photon absorption process. Enhanced upconversion luminescence have been observed with replacing K⁺ for Na⁺ and Li⁺.

Keywords:	Tm³⁺/Yb³⁺ Upconversion Tellurite gallium glasses
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