Efficient light-emitting diodes based on oriented perovskite nanoplatelets

Jieyuan Cui; Yang Liu; Yunzhou Deng; Chen Lin; Zhishan Fang; Chensheng Xiang; Peng Bai; Kai Du; Xiaobing Zuo; Kaichuan Wen; Shaolong Gong; Haiping He; Zhizhen Ye; Yunan Gao; He Tian; Baodan Zhao; Jianpu Wang; Yizheng Jin

doi:10.1126/sciadv.abg8458

Efficient light-emitting diodes based on oriented perovskite nanoplatelets

Sci Adv. 2021 Oct 8;7(41):eabg8458. doi: 10.1126/sciadv.abg8458. Epub 2021 Oct 8.

Authors

Jieyuan Cui¹, Yang Liu², Yunzhou Deng¹, Chen Lin³, Zhishan Fang³, Chensheng Xiang⁴, Peng Bai⁵, Kai Du⁴, Xiaobing Zuo⁶, Kaichuan Wen⁷, Shaolong Gong⁸, Haiping He³, Zhizhen Ye^{3

9}, Yunan Gao⁵, He Tian⁴, Baodan Zhao¹⁰, Jianpu Wang⁷, Yizheng Jin¹

Affiliations

¹ Zhejiang Key Laboratory for Excited-State Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
² Zhejiang Key Laboratory for Excited-State Materials, State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
³ State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
⁴ Centre of Electron Microscope, State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
⁵ China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
⁶ X-Ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
⁷ Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Centre for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.
⁸ Department of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, China.
⁹ ZJU-WZ Novel Materials Science & Technology Innovation Center, Institute of Wenzhou, Zhejiang University, Wenzhou 325006, China.
¹⁰ State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China.

Abstract

Solution-processed planar perovskite light-emitting diodes (LEDs) promise high-performance and cost-effective electroluminescent devices ideal for large-area display and lighting applications. Exploiting emission layers with high ratios of horizontal transition dipole moments (TDMs) is expected to boost the photon outcoupling of planar LEDs. However, LEDs based on anisotropic perovskite nanoemitters remain to be inefficient (external quantum efficiency, EQE <5%) due to the difficulties of simultaneously controlling the orientations of TDMs, achieving high photoluminescence quantum yields (PLQYs) and realizing charge balance in the films of assembled nanostructures. Here, we demonstrate efficient electroluminescence from an in situ grown perovskite film composed of a monolayer of face-on oriented nanoplatelets. The ratio of horizontal TDMs of the perovskite nanoplatelet film is ~84%, which leads to a light-outcoupling efficiency of ~31%, substantially higher than that of isotropic emitters (~23%). In consequence, LEDs with a peak EQE of 23.6% are achieved, representing highly efficient planar perovskite LEDs.