Mn^2+掺杂水溶性NaBiF4∶Yb/Er上转换微米晶的制备及其上转换发光性能

Preparation of Mn^2+Doping Water-soluble NaBiF4∶Yb/Er Microcrystals and Their Upconversion Luminescence Properties

NaBiF4作为一种新型的上转换发光基质材料,具有优异的发光性能。本文以聚乙烯吡咯烷酮(PVP)作为表面活性剂,通过溶剂热法成功制备出水溶性NaBiF4∶Yb^3+/Er^3+/Mn^2+上转换微米晶,并对其晶相、形貌及发光性能进行了表征。在980 nm激发光条件下,NaBiF4∶Yb^3+/Er^3+/Mn^2+可发射出强烈的绿色发光,且发光强度随Mn^2+掺杂浓度的提高呈现先增强后减弱的趋势,表现出优异的上转换发光性能。同时,NaBiF4∶Er^3+/Yb^3+/Mn^2+上转换发光对温度具有良好的依赖性,有望成为潜在的温度传感器材料。

As a new type of upconversion matrix,NaBiF4 has been found with excellent luminescence properties.In this paper,polyvinyl pyrrolidone(PVP)was used as the surfactant,and the water-soluble NaBiF4∶Er^3+/Yb^3+/Mn^2+particles were successfully prepared by a solvothermal synthesis.The crystal phase,morphology and luminescence properties of the microcrystals were studied.Under the excitation of 980 nm laser,NaBiF4∶Er^3+/Yb^3+/Mn^2+microcrystals show excellent upconversion luminescence(UCL).The upconversion emission intensity increased at first and then decreased with the increase of the dopant concentrations of Mn^2+ions.Moreover,the temperature-dependent UCL properties of NaBiF4∶Yb^3+/Er^3+/Mn^2+were investigated systematically under 980 nm excitation.The microcrystals could be a potential candidate for sensitive temperature sensor.