论文部分内容阅读
测量了Tm3+离子不同浓度(0.5at.%,3at.%,5at.%)掺杂的NaY(WO4)2晶体在800nm激光二极管激发下的上转换发射光谱.结合吸收谱、荧光谱和由Judd-Ofelt理论计算的光谱参数,详细分析了Tm3+:NaY(WO4)2晶体中上转换能量传递机理和离子浓度对上转换发射的影响.讨论了四种影响上转换发光效率的离子间相互作用机理:3H5+1G4→3H6+1D2,3H5+3H5→3H6+3F3,1G4+3H6→3F4+3F3,1G4+3H6→3F3+3F4,并根据Miyakawa-Dexter理论定量计算了各过程的发生概率.论证了交叉弛豫和共协上转换等浓度猝灭效应是影响Tm3+离子蓝色上转换荧光发射效率的主要因素.
Upconversion emission spectra of NaY (WO4) 2 doped with different concentrations of Tm3 + ions (0.5at.%, 3at.%, 5at.%) Under 800nm laser diode excitation were measured. The absorption spectra, The influence of up-conversion energy transfer mechanism and ion concentration on the up-conversion emission in Tm3 +: NaY (WO4) 2 crystal was analyzed in detail by using the spectral parameters calculated from the Ofelt theory. The four intermolecular interaction mechanisms affecting the up-conversion luminescence efficiency : 3H5 + 1G4 → 3H6 + 1D2,3H5 + 3H5 → 3H6 + 3F3,1G4 + 3H6 → 3F4 + 3F3,1G4 + 3H6 → 3F3 + 3F4, and the probability of occurrence of each process was calculated quantitatively according to the Miyakawa-Dexter theory. The concentration quenching effects such as cross-relaxation and co-upconversion are the main factors affecting the blue upconversion fluorescence emission efficiency of Tm3 + ions.