Luminous Butterflies: Efficient Exciton Harvesting by Benzophenone Derivatives for Full-Color Delayed Fluorescence OLEDs†
Sae Youn Lee
Department 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/
Search for more papers by this authorCorresponding Author
Prof. Dr. Takuma Yasuda
Department 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/
International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)
PRESTO (Japan) Science and Technology Agency (JST), Chiyoda-ku, Tokyo 102-0076 (Japan)
Department 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/Search for more papers by this authorDr. Yu Seok Yang
Department 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/
Search for more papers by this authorDr. Qisheng Zhang
Department 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/
Search for more papers by this authorCorresponding Author
Prof. Dr. Chihaya Adachi
Department 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/
International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)
Department 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/Search for more papers by this authorSae Youn Lee
Department 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/
Search for more papers by this authorCorresponding Author
Prof. Dr. Takuma Yasuda
Department 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/
International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)
PRESTO (Japan) Science and Technology Agency (JST), Chiyoda-ku, Tokyo 102-0076 (Japan)
Department 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/Search for more papers by this authorDr. Yu Seok Yang
Department 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/
Search for more papers by this authorDr. Qisheng Zhang
Department 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/
Search for more papers by this authorCorresponding Author
Prof. Dr. Chihaya Adachi
Department 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/
International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395 (Japan)
Department 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/Search for more papers by this authorThis work was supported by a Grant-in-Aid from the Funding Program for World-Leading Innovation R&D on Science and Technology (FIRST), Precursory Research for Embryonic Science and Technology (PRESTO) from JST (no. 10111), and from JSPS Young Scientist (A) (no. 25708032). C.A. and T.Y. acknowledge the support of WPI-I2CNER, sponsored by MEXT (Japan). OLEDs=organic light-emitting diodes.
Graphical Abstract
Lighting up: Butterfly-shaped benzophenone derivatives with small excited singlet–triplet energy gaps are demonstrated to exhibit efficient full-color delayed fluorescence. Organic light-emitting diodes employing these benzophenones as emitters can generate electroluminescence across most of the color gamut range, including white.
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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