Intramolecular Cyclization: A Convenient Strategy to Realize Efficient BT.2020 Blue Multi-Resonance Emitter for Organic Light-Emitting Diodes

Chen Cao; Ji-Hua Tan; Ze-Lin Zhu; Jiu-Dong Lin; Hong-Ji Tan; Huan Chen; Yi Yuan; Man-Kit Tse; Wen-Cheng Chen; Chun-Sing Lee

doi:10.1002/anie.202215226

Author(s)

Jiu-Dong Lin
Yi Yuan
Man-Kit Tse
Wen-Cheng Chen
Chun-Sing Lee

Related Research Unit(s)

Detail(s)

Original language	English
Article number	e202215226
Journal / Publication	Angewandte Chemie - International Edition
Volume	62
Issue number	10
Online published	2 Jan 2023
Publication status	Published - 1 Mar 2023

Link(s)

DOI	DOI https://doi.org/10.1002/anie.202215226 Final Published version
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Attachment(s)	Documents 126947936.pdf Post-print, 1.29 MB, PDF Publisher's Copyright Statement This is the peer reviewed version of the following article: Cao, C., Tan, J-H., Zhu, Z-L., Lin, J-D., Tan, H-J., Chen, H., Yuan, Y., Tse, M-K., Chen, W-C., & Lee, C-S. (2023). Intramolecular Cyclization: A Convenient Strategy to Realize Efficient BT.2020 Blue Multi-Resonance Emitter for Organic Light-Emitting Diodes. Angewandte Chemie - International Edition, 62(10), Article e202215226, which has been published in final form at https://doi.org/10.1002/anie.202215226. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85146662090&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(e3a86847-c2ca-4fdf-b065-14d0e7113c19).html

Abstract

Rationally tuning the emission position and narrowing the full width at half-maximum (FWHM) of an emitter is of great importance for many applications. By synergistically improving rigidity, strengthening the resonant strength, inhibiting molecular bending and rocking, and destabilizing the HOMO energy level, a deep-blue emitter (CZ2CO) with a peak wavelength of 440 nm and an ultranarrow spectral FWHM of 16 nm (0.10 eV) was developed via intramolecular cyclization in a carbonyl/N resonant core (QAO). The dominant υ_0-0 transition character of CZ2CO gives a Commission Internationale de I’Éclairage coordinates (CIE) of (0.144, 0.042), nicely complying with the BT.2020 standard. Moreover, a hyper-fluorescent device based on CZ2CO shows a high maximum external quantum efficiency (EQE_max) of 25.6 % and maintains an EQE of 22.4 % at a practical brightness of 1000 cd m⁻². © 2023 Wiley-VCH GmbH.