基于二维钙钛矿的复合型白光LED研究  

Study on compound white LED based on two-dimensional perovskite

作　　者：贾潜伟 徐公杰[1] JIA Qianwei;XU Gongjie(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2023年第6期42-51,共10页Optical Instruments

基　　金：上海市自然科学基金(20ZR437400)。

摘　　要：二维钙钛矿的宽带发射引起了人们对单组分白光二极管的兴趣。二维钙钛矿(PEA)_(2)PbBr_(2)Cl_(2)和(C_(6)H_(18)N_(2)O_(2))PbBr_(4)具有软晶格特性,因而能产生很强的光声耦合作用,使得受激产生的电子–空穴对(激子)很容易引起晶格畸变从而被晶格捕获,形成自陷激子(self-trapping excitons,STEs),发射出全光谱白光。研究表明:这2种材料的半高全宽可以达到232nm和194nm;斯托克斯位移分别为182nm和198nm;荧光寿命为9.812ns和13.465ns。它们在CIE色度图上坐标分别为(0.36,0.40)和(0.40,0.44),显色指数(color rendering indexes,CRI)为86.93和82.23。基于这2种钙钛矿,结合商用的紫外LED,制成的复合型LED色温在5000 K左右,为设计单组分白光二极管提供了新的思路和方法。Broadband emission of two-dimensional perovskite has aroused interest in singlecomponent white-light-emitting diodes.In this paper,we use the soft lattice properties of twodimensional perovskite(PEA)_(2)PbBr_(2)Cl_(2) and(C_(6)H_(18)N_(2)O_(2))PbBr_(4),which have strong photoacoustic coupling effect.The photo-excited electron-hole pair(exciton)is easy to cause lattice distortion and thus be captured by the lattice,forming self-trapping excitons(STEs),which can emit full spectrum white light.The results show that the half-height and full width of the two materials can reach 232 nm and 194 nm,the stokes shift is 182 nm and 198 nm respectively,and the fluorescence lifetime is 9.812 ns and 13.465 ns.Their coordinates on chrominance diagrams(CIE)are(0.36,0.40)and(0.40,0.44),color rendering indexes(CRI)are 86.93 and 82.23.Based on these two kinds of perovskites,combined with commercial UV LED,the composite LED color temperature is about 5000 K,providing a new understanding and perspective for the design of single-component whitelight-emitting diodes.

关 键 词：二维钙钛矿 自陷激子 宽谱发射 白光发射 LED 

分 类 号：O432.12[机械工程—光学工程]