Ligands Optimization Governed by Solubility Principles for Pure Blue Emission in Mixed-Halide Perovskite LEDs

Li, Dongyu; Lyu, Benzheng; Sun, Jiayun; Xiong, Qi; Zhu, Hanwen; Jiang, Zhengyan; Zhang, Dezhong; Liu, Chunyu; Choy, Wallace C. H.

2024-06-01

10.1021/acsenergylett.4c00881

ACS ENERGY LETTERS   影响因子和分区

2380-8195

Mixed-chloride/bromide perovskite nanocrystals (PeNCs) possess unique advantages for pure blue emission but suffer from severe halogen segregation. While ligand exchange is a promising method to improve stability, there are limited studies on comparative evaluation of the ligand ion pair combinations. We conduct a comprehensive investigation of the ligand exchange process by combining different ion pairs. Surprisingly, changes of ligand ion combinations cause a deviation from pure blue emission of CsPbBr x Cl3-x , even without intentional halogen alteration. This spectral shift is attributed to the halogen redistribution, which is dominated by the solubility principle in a nonpolar environment. With a detailed ligand-exchange study, we demonstrate pure-blue perovskite light-emitting diodes (PeLEDs) with an external quantum efficiency (EQE) of 7.45% and an operational half-lifetime (T- 50) of 61 min at an initial luminance of 100 cd m(-2). Our findings provide a ligand selection guideline and promote mixed-halide, pure blue PeLEDs for practical applications.

SCI ; EI

英语

其他

University Grant Council of the University of Hong Kong["202011159254","202111159113"] ; General Research Fund["17211220","7200021","17200823"] ; Collaborative Research Fund[C7035-20G] ; Innovation and Technology Fund from Innovation and Technology Commission[ITS/277121FP]

Chemistry ; Electrochemistry ; Energy & Fuels ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Electrochemistry ; Energy & Fuels ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001261301800001

AMER CHEMICAL SOC

20242416251958

Chlorine compounds ; Ion exchange ; Ions ; Light emitting diodes ; Perovskite ; Solubility

Minerals:482.2 ; Semiconductor Devices and Integrated Circuits:714.2 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2

Web of Science

1.Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong 999077, Peoples R China
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
3.Univ Hong Kong, Mat Innovat Inst Life Sci & Energy MILES, Shenzhen Inst Res & Innovat HKU SIRI, Shenzhen 518055, Peoples R China

Li, Dongyu,Lyu, Benzheng,Sun, Jiayun,et al. Ligands Optimization Governed by Solubility Principles for Pure Blue Emission in Mixed-Halide Perovskite LEDs[J]. ACS ENERGY LETTERS,2024,9:3261-3268.

Li, Dongyu.,Lyu, Benzheng.,Sun, Jiayun.,Xiong, Qi.,Zhu, Hanwen.,...&Choy, Wallace C. H..(2024).Ligands Optimization Governed by Solubility Principles for Pure Blue Emission in Mixed-Halide Perovskite LEDs.ACS ENERGY LETTERS,9,3261-3268.

Li, Dongyu,et al."Ligands Optimization Governed by Solubility Principles for Pure Blue Emission in Mixed-Halide Perovskite LEDs".ACS ENERGY LETTERS 9(2024):3261-3268.