High‐n Phase Suppression for Efficient and Stable Blue Perovskite Light‐Emitting Diodes

Author:

Shen Piaoyang123,Ding Shuo143,Tang Zhaobing135,Qian Lei135,Zhang Ting135,Xiao Peng6,Chen Tao6,Chen Hao4,Zhang Xinyu4,Ren Yong478,Zhao Dewei2,Xiang Chaoyu135ORCID

Affiliation:

1. Laboratory of Advanced Nano‐Optoelectronic Materials and Devices Qianwan Institute of CNITECH Ningbo Zhejiang 315336 China

2. College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education Sichuan University Chengdu Sichuan 610065 China

3. Laboratory of Optoelectronic and Information Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo Zhejiang 315201 China

4. Department of Mechanical, Materials and Manufacturing Engineering University of Nottingham Ningbo China Ningbo Zhejiang 315100 China

5. Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Ningbo Zhejiang 315100 China

6. Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering School of Chemistry and Materials Science University of Science and Technology of China Hefei Anhui 230026 China

7. Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo China Ningbo Zhejiang 315100 China

8. Key Laboratory of Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province University of Nottingham Ningbo China Ningbo Zhejiang 315100 China

Abstract

AbstractQuasi‐2D perovskites light‐emitting diodes (PeLEDs) have achieved significant progress due to their superior optical and electronic properties. However, the blue PeLEDs still exist inefficient energy transfer and electroluminescence performance caused by mixed multidimensional phase distribution. In this work, transition metal salt (zinc bromide, ZnBr2) is introduced to modulate phase distributions by suppressing the nucleation of high n phase perovskites, which effectively shortens the energy transfer path for blue emission. Moreover, ZnBr2 also facilitates energy level matching and reduces non‐radiative recombination, thus improving electroluminescence (EL) efficiency. Benefiting from these combined improvements, an efficient blue PeLEDs is obtained with a maximum external quantum efficiency (EQE) of 16.2% peaking located at 486 nm. This work provides a promising approach to tune phase distribution of quasi‐2D perovskites and achieving highly efficient blue PeLEDs.

Funder

National Key Research and Development Program of China

Publisher

Wiley

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