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Li L, Huang T, Xu Y, Qu Y, Cui W, Xu L, Li C, Wang Y. Ultra-Narrowband Organic Electroluminescence with External Quantum Efficiency of 40% from Indolocarbazole-Embedded Multiple Resonance Emitters. Angew Chem Int Ed Engl 2025; 64:e202504002. [PMID: 40095389 DOI: 10.1002/anie.202504002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2025] [Revised: 03/07/2025] [Accepted: 03/17/2025] [Indexed: 03/19/2025]
Abstract
The demand for ultra-high-definition display technology has spurred the prosperity of multiple resonance induced thermally activated delayed fluorescence (MR-TADF) materials with narrow full-width at half-maximum (FWHM) and high efficiency, making them highly promising candidates for high-color-purity organic light-emitting diodes (OLEDs) displays. Indolocarbazole, a highly rigid aza-polycyclic aromatic hydrocarbon framework, has shown significant potential as a building block for constructing MR-TADF emitters with ultra-narrowband emission (<20 nm). However, it remains a great challenge to construct ultra-narrowband indolocarbazole-embedded MR-TADF emitters with emission maxima less than 500 nm. Here, two MR-TADF emitters, DBN-amICz and DBN-bmICz, are constructed by adopting meta-N-π-N-type indolocarbazole as core framework and achieve ultra-narrowband blue-green emission in toluene solution with peaks of both 490 nm and FWHMs of 18 and 19 nm, respectively. OLEDs incorporating emitters DBN-amICz and DBN-bmICz demonstrate excellent electroluminescence (EL) performances, with maximum external quantum efficiencies (EQEs) of 40.1% and 35.5%, and FWHMs of 21 and 24 nm, respectively. This study represents the first report of dual-boron-containing MR emitters derived from indolocarbazole with emission below 500 nm, filling a gap in the development of indolocarbazole-embedded dual-boron-containing blue-green MR-TADF emitters.
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Affiliation(s)
- Linjie Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China
| | - Tingting Huang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China
| | - Yincai Xu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585, Singapore
| | - Yupei Qu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China
| | - Weibo Cui
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China
| | - Lu Xu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China
| | - Chenglong Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China
| | - Yue Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P.R. China
- Jihua Laboratory, 28 Huandao Nan Road, Foshan, Guangdong Province, 528200, P.R. China
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