高效绿光钙钛矿发光二极管研究进展  

Research progress of efficient green perovskite light emitting diodes

作　　者：瞿子涵 储泽马 张兴旺[1,2] 游经碧 Qu Zi-Han;Chu Ze-Ma;Zhang Xing-Wang;You Jing-Bi(Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院半导体研究所,材料科学重点实验室,北京100083 [2]中国科学院大学,材料科学与光电工程中心,北京100049

出　　处：《物理学报》2019年第15期59-67,共9页Acta Physica Sinica

摘　　要：钙钛矿发光二极管具有发光效率高、色纯、发光波长在可见光区间连续可调等优点,近来成为研究前沿热点.作为人眼最为敏感的波段,绿光发射的钙钛矿发光二极管对于白光照明和平板显示具有重要意义,得到了科研人员的广泛关注.本文主要介绍绿光钙钛矿发光二极管的发展历史、钙钛矿材料和发光二极管器件的基本结构以及提升绿光钙钛矿发光二极管效率的主要方法.最后本文对未来绿光钙钛矿发光二极管可能的发展方向进行了简要的预测,以期对未来该领域的研究提供一些思路.Perovskite light emitting diodes exhibit the advantages of high color purity,tunable wavelength and low producing cost.Considering these superiorities,one regards perovskite light emitting diodes as very promising candidates for solid state lighting and panel displaying.Human eyes are very sensitive to green light,thus green perovskite light emitting diodes receive the most attention from researchers.Since the advent of the very first green perovskite light emitting diode,the external quantum efficiency has climbed from only 0.1% to over 20%.In this review,we mainly discuss the history of green perovskite light emitting diodes,the basic concepts of perovskite materials and green perovskite light emitting diodes,and the common methods to improve the efficiency of green perovskite light emitting diodes.The bandgap of bromide perovskite is about 2.3 eV,which is located just on a green light wavelength scale and thus becomes the suitable emitting layer material for green emission.There are mainly two types of device structures,i.e.regular format and inverted format.The whole working process of green perovskite light emitting diodes can be divided into two stages,i.e.the injection and recombination of charge carriers.One engineers the energy levels of different layers to improve the injection of charge carriers.They also raise up the strategy so-called surface passivation to reduce the defect density at the interface in order to avoid the quenching phenomenon.One usually inserts a buffering layer to realize the surface passivation.Besides,perovskites possess very small exciton binding energy,which is at the same order of magnitudes as the kinetic energy at room temperature.Charge carriers become free in this case,which will severely reduce the radiation recombination probability due to the non-radiation recombination process such as Shockley-Read-Hall effect and Auger recombination.To solve the problem,people fabricate three types of perovskites,namely quasi two-dimensional perovskite,perovskite quantum dot,and perovs

关 键 词：钙钛矿 发光二极管 绿光 效率 

分 类 号：TN312.8[电子电信—物理电子学]