Pr^(3+)掺杂铯铅卤钙钛矿量子点的稳定可调色蓝光发射

Stable and Tunable Blue Emission from Pr Doped Cesium Lead Halide Perovskite Quantum Dots

卤化钙钛矿型发光二极管(PeLED)的窄发射峰有望用于下一代显示器和照明,但是能量转换效率特别是蓝色PeLED的转换效率仍然低于常规无机和有机LED的效率。在这些钙钛矿中用毒性较小的元素(通常是过渡金属和各种镧系元素)取代Pb,可在保持窄的发射特性的同时提高能源效率。本文介绍了Pr^(3+)掺杂与Cl-Br卤化物交换结合的效果,产生了一系列蓝色发射量子点,峰值波长可在430~490 nm范围内可调,这些蓝色Pr^(3+)-CsPb(Br/Cl)3量子点的光致发光量子产率(PLQY)比未掺杂Pr^(3+)的量子点相比提高了2~3倍。本文还研究了Pr^(3+)掺杂蓝光量子点在365 nm紫外线照射下和高温加热时的稳定性,掺杂后的蓝光量子点的光热稳定性提升。

Lead halide perovskite light-emitting diodes(PeLEDs)are promising for next-generation displays and lighting due to their narrow emission peak.However,the energy conversion efficiency,especially that of the blue PeLED,is still below the efficiency of the conventional inorganic and organic counterparts.Substituting Pb in these perovskites with less toxic elements(typically transition metals and various lanthanides)can maintain narrow emission characteristics while improving the energy efficiency.The effect of Pr^(3+)doping in conjunction with Cl-Br halide exchange is presented in this paper,which produces a series of blue emitting quantum dot with their peak wavelength tunable from 430 nm to 490 nm.The photoluminescence quantum yield(PLQY)of these blue Pr^(3+)-CsPb(Br/Cl)3 QDs are increased by 2~3 times compared to those without Pr^(3+)doping.Stability under ultraviolet(UV)exposure or upon heating are investigated.In this paper,the stability of Pr^(3+)doped blue light quantum dots under UV radiation of 365 nm and high temperature heating is also studied,and the photothermal stability of doped blue light quantum dots is improved.