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Research Article | Open Access

Anisotropic emission of orientation-controlled mixed-dimensional perovskites for light-emitting devices

Yuhui Qia, Yang Liub,c( ), Chen Linb, Yunzhou Dengd, Peng Baie, Yunan Gaoe, Haiming Zhua, Zhizhen Yeb,c( ), Yizheng Jina( )
Key Laboratory of Excited-State Materials of Zhejiang Province, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
State Key Laboratory of Silicon Materials, School of Materials and Engineering, Zhejiang University, Hangzhou, 310027, China
Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials, Institute of Wenzhou, Zhejiang University, Wenzhou, 325006, China
State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, 310027, China
China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing, 100871, China

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

Abstract

Perovskite light-emitting diodes (PeLEDs) are attracting increasing attention owing to their impressive efficiencies and high luminance across the full visible light range. Further improvement of the external quantum efficiency (EQE) of planar PeLEDs is limited by the light out-coupling efficiency. Introducing perovskite emitters with directional emission in PeLEDs is an effective way to improve light extraction. Here, we report that it is possible to achieve directional emission in mixed-dimensional perovskites by controlling the orientation of the emissive center in the film. Multiple characterization methods suggest that our mixed-dimensional perovskite film shows highly orientated transition dipole moments (TDMs) with the horizontal ratio of over 88%, substantially higher than that of the isotropic emitters. The horizontally dominated TDMs lead to PeLEDs with exceptional high light out-coupling efficiency of over 32%, enabling a high EQE of 18.2%.

Keywords

Perovskite light-emitting diodesMixed dimensional peorvskiteTransition dipole momentEmission orientationLight outcoupling

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Journal of Materiomics
Volume 9 Issue 4,
July 2023
Pages 762-767
DOI: 10.1016/j.jmat.2023.01.014
Cite this article:
Qi Y, Liu Y, Lin C, et al. Anisotropic emission of orientation-controlled mixed-dimensional perovskites for light-emitting devices. Journal of Materiomics, 2023, 9(4): 762-767. https://doi.org/10.1016/j.jmat.2023.01.014

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Received: 14 October 2022
Revised: 29 January 2023
Accepted: 31 January 2023
Published: 02 March 2023
© 2023 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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