Yb<sup>3+</sup>敏化Tm<sup>3+</sup>掺杂氧卤碲酸盐玻璃的上转换发光研究

研究了Yb2O3浓度对Tm3+/Yb3+共掺氧卤碲酸盐玻璃的上转换发光的影响，分析了上转换发光机理。结果发现，通过980 nm的激光二极管激发，在室温下同时观察到强烈的蓝光(475 nm)和微弱的红光(649 nm)，分别是由于Tm3+离子1G4→3H6和1G4→3F4跃迁产生的；上转换机理分析表明，上转换蓝光和红光都是由于双光子吸收过程。随Yb2O3浓度增加，Yb3+离子寿命降低，Yb3+到Tm3+的能量转移效率增加，上转换蓝光和红光强度先增加，在Yb2O3摩尔比为3时达到最大，然后降低。分析认为，Yb3+的浓度猝灭主要是由于3H4(Tm3+)→2F5/2(Yb3+)反向能量转移的结果。结果表明Yb3+敏化Tm3+掺杂氧卤碲酸盐玻璃是一种上转换蓝光激光器的潜在基质材料。

Abstract

The effects of Yb2O3 concentration on upconversion luminescence spectra of Tm3+/Yb3+-codoped oxyhalide tellurite glasses were studied, and upconversion luminescence mechanism of Yb3+ sensitize Tm3+ in oxyhalide tellurite glasses was analyzed. The results showed that intense blue (475 nm) and weak red (649 nm) emission corresponding to the 1G4→3H6 and 1G4→3F4 transitions of Tm3+, respectively, were simultaneously observed at room temperature under 980 nm laser diode (LD) excitation. Upconversion mechanism analysis showed that a two-photon upconversion process is assigned to the blue and red emission; with increasing Yb2O3 concentration, the lifetime of Yb3+ decreases, the energy transfer efficiency of Yb3+ to Tm3+ increases, upconversion blue and red emission intensities first increase, reach its maximum at molar ratio 3 of Yb2O3 concentration, and then decrease. It is considered that the concentration quenching of Yb3+ is due to energy back-transfer of 3H4 (Tm3+)→2F5/2(Yb3+). The results showed that Yb3+-sensitized Tm3+-doped oxyhalide tellurite glasses can be used as a kind of potential host materials for upconversion blue lasers.

参考文献

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徐时清, 黄俊, 张丽艳, 赵士龙, 王宝龄. Yb³⁺敏化Tm³⁺掺杂氧卤碲酸盐玻璃的上转换发光研究[J]. 光学学报, 2006, 26(2): 225. 徐时清, 黄俊, 张丽艳, 赵士龙, 王宝龄. Invesitigation on Upconversion Luminescence of Yb³⁺-Sensitized Tm³⁺-Doped Oxyhalide Tellurite Glasses[J]. Acta Optica Sinica, 2006, 26(2): 225.

Yb³⁺敏化Tm³⁺掺杂氧卤碲酸盐玻璃的上转换发光研究

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