Yb3+敏化Tm3+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。

Invesitigation on Upconversion Luminescence of Yb3+-Sensitized Tm3+-Doped Oxyhalide Tellurite Glasses

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.