Mn~(2+)掺杂NaBiF_4∶Yb/Er体系的可调控上转换发光

采用溶剂热法制备了不同Mn~(2+)掺杂量的NaBiF_4∶Yb/Er/Mn上转换发光体系,研究了其形貌、晶相、上转换发光性能随Mn~(2+)掺杂量的变化,并探讨了该体系的能量传递机理.实验结果表明,Mn~(2+)的掺杂不会引起NaBiF_4从六方相转变为立方相,但会增大其尺寸;同时在NaBiF_4体系中,Mn~(2+)可以与Er~(3+)进行能量传递,使红光发射得到增强,并且随着Mn~(2+)浓度的增加,红/绿光发射强度比也会随之增大.此外,还考察了NaBiF_4∶Yb/Er/Mn体系的变温发射光谱,发现当温度升高时,红/绿光强度比以及520 nm绿光与540 nm绿光发射强度比都总体上呈增大趋势.

Tunable Upconversion Luminescence of Mn2+Doping NaBiF4 : Yb/ Er Particles

NaBiF4 : Yb / Er/ Mn samples with different concentrations of Mn2+ were fabricated via the solvother-mal method. Also, the morphology and crystal phase, the changes of upconversion luminescence(UCL) upon different doping amounts of Mn2+ were investigated. Meanwhile, the mechanism of energy transfer in NaBiF4 :Yb / Er/ Mn was also discussed. The results indicate that, for NaBiF4 : Yb / Er, Mn2+ doping does not induce transition from hexagonal to cubic phase, but increases the size of the particles. Meanwhile, the energy transfer processes between Er3+ and Mn2+ can take place in NaBiF4 host, which eventually enhances the red emission to a certain degree. With the increasing of the concentration of Mn2+, the intensity ratio of red to green emission is also increased. In addition, the temperature-dependent UCL spectra of NaBiF4 : Yb / Er/ Mn was investiga-ted, and the intensity ratios of red to green emission and 520 nm green emission to 540 nm green emission are generally increased with elevated temperature.