Single-Layer Organic Light-Emitting Diode with Trap-Free Host Beats Power Efficiency and Lifetime of Multilayer Devices

© 2024 The Authors. Advanced Materials published by Wiley‐VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 16 vom: 01. Apr., Seite e2311892
1. Verfasser: Sachnik, Oskar (VerfasserIn)
Weitere Verfasser: Ie, Yutaka, Ando, Naoki, Tan, Xiao, Blom, Paul W M, Wetzelaer, Gert-Jan A H
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article charge transport device physics organic light‐emitting diodes thermally activated delayed fluorescence
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520 |a Organic light-emitting diodes (OLEDs) employing a single active layer potentially offer a number of benefits compared to multilayer devices; reduced number of materials and deposition steps, potential for solution processing, and reduced operating voltage due to the absence of heterojunctions. However, for single-layer OLEDs to achieve efficiencies approaching those of multilayer devices, balanced charge transport is a prerequisite. This requirement excludes many efficient emitters based on thermally activated delayed fluorescence (TADF) that exhibit electron trapping, such as the green-emitting bis(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)methanone (DMAC-BP). By employing a recently developed trap-free large band gap material as a host for DMAC-BP, nearly balanced charge transport is achieved. The single-layer OLED reaches an external quantum efficiency (EQE) of 19.6%, which is comparable to the reported EQEs of 18.9-21% for multilayer devices, but achieves a record power efficiency for DMAC-BP OLEDs of 82 lm W-1, clearly surpassing the reported multilayer power efficiencies of 52.9-59 lm W-1. In addition, the operational stability is greatly improved compared to multilayer devices and the use of conventional host materials in combination with DMAC-BP as an emitter. Next to the obvious reduction in production costs, single-layer OLEDs therefore also offer the advantage of reduced energy consumption and enhanced stability 
650 4 |a Journal Article 
650 4 |a charge transport 
650 4 |a device physics 
650 4 |a organic light‐emitting diodes 
650 4 |a thermally activated delayed fluorescence 
700 1 |a Ie, Yutaka  |e verfasserin  |4 aut 
700 1 |a Ando, Naoki  |e verfasserin  |4 aut 
700 1 |a Tan, Xiao  |e verfasserin  |4 aut 
700 1 |a Blom, Paul W M  |e verfasserin  |4 aut 
700 1 |a Wetzelaer, Gert-Jan A H  |e verfasserin  |4 aut 
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773 1 8 |g volume:36  |g year:2024  |g number:16  |g day:01  |g month:04  |g pages:e2311892 
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