期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 9, 期 23, 页码 7458-7464出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc01458g
关键词
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资金
- Nano Materials Research Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [2016M3A7B4909243]
This study introduces a new device structure strategy for TADF OLEDs, selectively managing long-living triplet excitons to achieve high efficiency and long device lifetime. The incorporation of a triplet exciton quenching layer near the recombination zone significantly enhanced the device lifetime without efficiency loss.
In the organic light-emitting diodes (OLEDs), the achievement of high efficiency and long device lifetime has been a goal due to the short device lifetime of the high efficiency blue OLED devices. The strategy for the device structure in this study suggests a solution for high efficiency and long lifetime of blue thermally activated delayed fluorescent (TADF) OLEDs by selectively managing the long-living triplet excitons of TADF emitters mainly responsible for the short lifetime of TADF OLEDs. The introduction of a triplet exciton quenching layer (QL) positioned at a short distance from the recombination zone could quench the long-living triplet excitons of TADF emitters and dramatically enhance the device lifetime of TADF OLEDs without efficiency loss. Ultimately, the device lifetime was doubled while achieving a high external quantum efficiency of 22.0% compared to the conventional TADF OLED by selective quenching long-living triplet exciton. This study verifies the potential of QL in TADF OLEDs as a future strategy to achieve high efficiency and long lifetime in the blue OLEDs.
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