Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 35, Pages 11005-11013Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc03334c
Keywords
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Funding
- National Natural Science Foundation of China [21875036, 51103023]
- Fundamental Research Funds for the Central Universities [2242016K41082]
- National Basic Research Program (973 program) [2013CB932902]
- Priority Academic Program Development of Jiangsu Higher Education Institutions, Nanjing Science and Technology Committee [2014-030002]
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An optimized, thermally activated delayed fluorescence-(TADF)-sensitized fluorescence (TSF) strategy is proposed to boost the electroluminescence efficiency of solution-processed deep blue organic light-emitting diodes (OLED). The TADF sensitizer and the fluorescent emitter with a core-dendron structure emit mostly by a Forster energy transfer process while the Dexter energy transfer is suppressed by spatial separation. In addition, the high-bandgap carbazole terminal substituents are introduced to protect the hyper-fluorescent core by a cascade energy transfer channel. Fluorescent OLEDs based on a core-dendron system achieved a deep-blue emission with Commission Internationale de L'Eclairage (CIE) coordinates of (0.15,0.14) and a high external quantum efficiency of 10.16%. This new TSF system can be used in high efficiency fluorescent OLEDs with 100% exciton utilization, thereby promoting the development of solution-processed blue OLEDs.
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