Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms9476
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Funding
- Japan Society for the Promotion of Science (JSPS) through the 'Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program)'
- Collaborative Research Program of Institute for Chemical Research, Kyoto University [2015- 14]
- Joint Usage/Research Center (JURC) at the Institute for Chemical Research, Kyoto University, Japan
- Council for Science and Technology Policy (CSTP)
- Grants-in-Aid for Scientific Research [14J04794, 25248053, 23241032] Funding Source: KAKEN
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Efficient organic light-emitting diodes have been developed using emitters containing rare metals, such as platinum and iridium complexes. However, there is an urgent need to develop emitters composed of more abundant materials. Here we show a thermally activated delayed fluorescence material for organic light-emitting diodes, which realizes both approximately 100% photoluminescence quantum yield and approximately 100% up-conversion of the triplet to singlet excited state. The material contains electron-donating diphenylamin-ocarbazole and electron-accepting triphenyltriazine moieties. The typical trade-off between effective emission and triplet-to-singlet up-conversion is overcome by fine-tuning the highest occupied molecular orbital and lowest unoccupied molecular orbital distributions. The nearly zero singlet-triplet energy gap, smaller than the thermal energy at room temperature, results in an organic light-emitting diode with external quantum efficiency of 29.6%. An external quantum efficiency of 41.5% is obtained when using an out-coupling sheet. The external quantum efficiency is 30.7% even at a high luminance of 3,000 cdm(-2).
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