Energy-Efficient Stable Hyperfluorescence Organic Light-Emitting Diodes with Improved Color Purities and Ultrahigh Power Efficiencies Based on Low-Polar Sensitizing Systems

© 2023 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 35(2023), 22 vom: 24. Juni, Seite e2212237
1. Verfasser: Liu, Hao (VerfasserIn)
Weitere Verfasser: Fu, Yan, Chen, Jinke, Tang, Ben Zhong, Zhao, Zujin
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2023
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article hyperfluorescence low-polar sensitizing systems multi-resonance organic light-emitting diodes thermally activated delayed fluorescence
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520 |a Multi-resonance (MR) molecules with thermally activated delayed fluorescence (TADF) are emerging as promising candidates for high-definition displays because of their narrow emission spectra. However, the electroluminescence (EL) efficiencies and spectra of MR-TADF molecules are highly sensitive to hosts and sensitizers when applied to organic light-emitting diodes (OLEDs), and the highly polar environments in devices often lead to significantly broadened EL spectra. In this study, a proof-of-concept TADF sensitizer (BTDMAC-XT) with low polarity, high steric hindrance, and concentration-quenching free feature is constructed, which acts as a good emitter in doped and non-doped OLEDs with high external quantum efficiencies (ηext s) of 26.7% and 29.3%, respectively. By combining BTDMAC-XT with conventional low-polarity hosts, low-polarity sensitizing systems with a small carrier injection barrier and full exciton utilization are constructed for the MR-TADF molecule BN2. Hyperfluorescence (HF) OLEDs employing the low-polar sensitizing systems successfully improve the color quality of BN2 and afford an excellent ηext of 34.4%, a record-high power efficiency of 166.3 lm W-1 and a long operational lifetime (LT50  = 40309 h) at an initial luminance of 100 cd m-2 . These results provide instructive guidance for the sensitizer design and device optimization for energy-efficient and stable HF-OLEDs with high-quality light 
650 4 |a Journal Article 
650 4 |a hyperfluorescence 
650 4 |a low-polar sensitizing systems 
650 4 |a multi-resonance 
650 4 |a organic light-emitting diodes 
650 4 |a thermally activated delayed fluorescence 
700 1 |a Fu, Yan  |e verfasserin  |4 aut 
700 1 |a Chen, Jinke  |e verfasserin  |4 aut 
700 1 |a Tang, Ben Zhong  |e verfasserin  |4 aut 
700 1 |a Zhao, Zujin  |e verfasserin  |4 aut 
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773 1 8 |g volume:35  |g year:2023  |g number:22  |g day:24  |g month:06  |g pages:e2212237 
856 4 0 |u http://dx.doi.org/10.1002/adma.202212237  |3 Volltext 
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