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 υ0-0 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 (EQEmax) of 25.6 % and maintains an EQE of 22.4 % at a practical brightness of 1000 cd m−2. © 2023 Wiley-VCH GmbH.
| Original language | English |
|---|---|
| Article number | e202215226 |
| Journal | Angewandte Chemie - International Edition |
| Volume | 62 |
| Issue number | 10 |
| Online published | 2 Jan 2023 |
| DOIs | |
| Publication status | Published - 1 Mar 2023 |
Research Keywords
- Aromatic Diketone
- Blue Thermally Activated Delayed Fluorescence
- Intramolecular Cyclization
- Multi-Resonance Emitter
- Organic Light-Emitting Diodes
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED POSTPRINT FILE: 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.
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