期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 7, 期 10, 页码 3082-3089出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc06575f
关键词
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资金
- Basic Science Research Program [2016R1A2B3008845]
- Nano Materials Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2016R1A2B3008845, 2016M3A7B4909243]
A novel blue thermally activated delayed fluorescence (TADF) organic light-emitting diode with an emitting layer made up of a TADF assistant dopant and a pure blue-emitting TADF emitter was developed to demonstrate a pure blue color, a high external quantum efficiency, suppressed efficiency roll-off, and an improved lifetime. Two fused B-N type blue TADF emitters with a narrow emission spectrum were used as the blue emitters and the narrow blue emission was harvested by a TADF assistant dopant through a reverse intersystem crossing mediated cascade energy transfer process. A high external quantum efficiency of 31.4%, pure blue emission color of (0.13, 0.15), significant reduction of the efficiency roll-off and more than 10 times lifetime extension were simultaneously achieved using the TADF assisted TADF process.
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