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Rapid crystallization-driven high-efficiency phase-pure deep-blue Ruddlesden-Popper perovskite light-emitting diodes

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Title
Rapid crystallization-driven high-efficiency phase-pure deep-blue Ruddlesden-Popper perovskite light-emitting diodes
Author(s)
Jang, Gyumin; Han, Hyowon; Ma, Sunihl; Lee, Junwoo; Uk Lee, Chan; Jeong, Wooyong; Son, Jaehyun; Dongki Cho; Ji-Hee Kim; Park, Cheolmin; Moon, Jooho
Publication Date
2023-01
Journal
Advanced Photonics, v.5, no.1
Publisher
SPIE
Abstract
© The Authors. Published by SPIE and CLP under a Creative Commons Attribution 4.0 International License. Perovskite light-emitting diodes (PeLEDs) are considered as promising candidates for next-generation solution-processed full-color displays. However, the external quantum efficiencies (EQEs) and operational stabilities of deep-blue (<460 nm) PeLEDs still lag far behind their red and green counterparts. Herein, a rapid crystallization method based on hot-antisolvent bathing is proposed for realization of deep-blue PeLEDs. By promoting immediate removal of the precursor solvent from the wet perovskite films, development of the quasi-two-dimensional (2D) Ruddlesden-Popper perovskite (2D-RPP) crystals with n values >3 is hampered completely, so that phase-pure 2D-RPP films with bandgaps suitable for deep-blue PeLEDs can be obtained successfully. The uniquely developed rapid crystallization method also enables formation of randomly oriented 2D-RPP crystals, thereby improving the transfer and transport kinetics of the charge carriers. Thus, high-performance deep-blue PeLEDs emitting at 437 nm with a peak EQE of 0.63% are successfully demonstrated. The color coordinates are confirmed to be (0.165, 0.044), which match well with the Rec.2020 standard blue gamut and have excellent spectral stability. © The Authors. Published by SPIE and CLP under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
URI
https://pr.ibs.re.kr/handle/8788114/13177
DOI
10.1117/1.AP.5.1.016001
ISSN
2577-5421
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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