The DOI matches its Crossref record; 32 of the 32 references it cites were found in a registry or an index.
Charge Transfer Excited State Promoted Multiple Resonance Delayed Fluorescence Emitter for High-Performance Narrowband Electroluminescence
Abstract
Multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters are promising candidates for narrowband organic light-emitting diodes, but their electroluminescent performance is typically hindered by the slow reverse intersystem crossing rate ( k RISC ). Herein, we present an effective strategy to introduce a multichannel reverse intersystem crossing (RISC) pathway with large spin–orbit coupling by orthogonally linking an electron-donating unit to the MR framework. Through delicate manipulation of the excited-state energy levels, an additional intersegmental charge transfer triplet state could be “silently” induced without perturbing the MR character of the lowest excited singlet state. The proof-of-concept emitter CzBN3 not only affords 23-fold increase of k RISC compared with its prototypical MR skeleton but also realizes close-to-unity photoluminescence quantum yield, large radiative rate constant, and very narrow emission spectrum. These merits enable high maximum external quantum efficiency (EQE max ) of up to 37.1% and alleviated efficiency roll-off in the sensitizer-free device (EQE 1000 = 30.4%), and a further boost of efficiency (EQE max/1000 = 42.3/34.1%) is realized in the hyperfluorescent device. The state-of-the-art electroluminescent performance validates the superiority of our molecular design strategy.
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Metadata
- Authors
- Huang, Z., Xie, H., Miao, J., Wei, Y., Zou, Y., Hua, T., Cao, X., & Yang, C.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2023-06-05
- Volume
- 145
- Issue
- 23
- Pages
- 12550-12560
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W4379377255
- Cited by
- 281
- References
- 32
- FWCI
- 20.60
- Type
- journal article
- Language
- en
- Open access
- closed
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