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Luminous butterflies: efficient exciton harvesting by benzophenone derivatives for full-color delayed fluorescence
Sae Youn Lee1, Takuma Yasuda, Yu Seok Yang
1Department of Applied Chemistry and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan) http://www.cstf.kyushu-u.ac.jp/∼adachilab/
Abstract:
Butterfly-shaped luminescent benzophenone derivatives with small energy gaps between their singlet and triplet excited states are used to achieve efficient full-color delayed fluorescence. Organic light-emitting diodes (OLEDs) with these benzophenone derivatives doped in the emissive layer can generate electroluminescence ranging from blue to orange-red and white, with maximum external quantum efficiencies of up to 14.3%. Triplet excitons are efficiently harvested through delayed fluorescence channels.
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