【摘要】 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。更多还原

【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⁺)→（）²F_5/2(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.更多还原