期刊
NATURE MATERIALS
卷 14, 期 3, 页码 330-336出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4154
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资金
- World-Leading Innovative R&D on Science and Technology (FIRST)
- nternational Institute for Carbon Neutral Energy Research [WPI-I2CNER]
- MEXT
- Grants-in-Aid for Scientific Research [26620165, 26708010] Funding Source: KAKEN
Organic compounds that exhibit highly efficient, stable blue emission are required to realize inexpensive organic light-emitting diodes for future displays and lighting applications. Here, we define the design rules for increasing the electroluminescence efficiency of blue-emitting organic molecules that exhibit thermally activated delayed fluorescence. We show that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions. A compound based on our design principles exhibited a high rate of fluorescence decay and efficient up-conversion of triplet excitons into singlet excited states, leading to both photoluminescence and internal electroluminescence quantum yields of nearly 100%.
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