Effect of Chloride Ion Concentrations on Luminescence Peak Blue Shift of Light-Emitting Diode Using Anti-Solvent Extraction of Quasi-Two-Dimensional Perovskite  

作　　者：Baoyu Liu Xiaoping Zou Dan Chen Taoran Liu Yuhua Zuo Jun Zheng Zhi Liu Buwen Cheng 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,Beijing Key Laboratory for Sensor,MOE Key Laboratory for Modern Measurement and Control Technology,Beijing Information Science and Technology University,Beijing 100101,China [2]the State Key Laboratory on Integrated Optoelectronics,Institute of Semiconductor,Chinese Academy of Sciences,Beijing 100083,China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Tsinghua Science and Technology》2021年第4期496-504,共9页清华大学学报（自然科学版（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2018YFB2200103);the National Natural Science Foundation of China(Nos.61875186 and 61975196);the Project of the Natural Science Foundation of Beijing(No.Z160002);the Key Research Projects of Beijing Information Science and Technology University(BISTU)(Nos.2019-22,2019-23,2019-27);the Beijing Key Laboratory for Sensors of BISTU(No.2019CGKF007)。

摘　　要：In recent years,Perovskite Light-Emitting Diodes(PeLEDs)have received considerable attention in academia.However,with the development of PeLEDs,commercial applications of full-color PeLED technology are largely limited by the progress of blue-emitting devices,due to the uncontrollably accurate composition,unstable properties,and low luminance.In this article,we add Cesium chloride(CsCl)to the quasi-two-dimensional(quasi-2D)perovskite precursor solution and achieve the relatively blue shifts of PeLED emission peak by introducing chloride ions for photoluminescence(PL)and electroluminescence(EL).We also found that the introduction of chlorine ions can make quasi-2D perovskite films thinner with smoother surface of 0.408 nm.It is interesting that the EL peaks and intensities of PeLED are adjustable under different driving voltages in high concentration chlorine-added perovskite devices,and different processes of photo-excited,photo-quenched,and photo-excited occur sequentially with the increasing driving voltage.Our work provides a path for demonstrating full-color screens in the future.

关 键 词：Perovskite Light-Emitting Diodes(PeLEDs) quasi-two-dimensional(quasi-2D) chloride ions blue shifts 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TN312.8[电子电信—物理电子学]