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Combined Inter‐ and Intramolecular Charge‐Transfer Processes for Highly Efficient Fluorescent Organic Light‐Emitting Diodes with Reduced Triplet Exciton Quenching |
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| Authors: | Chang‐Ki Moon Katsuaki Suzuki Katsuyuki Shizu Chihaya Adachi Hironori Kaji Jang‐Joo Kim |
| Affiliation: | 1. Department of Materials Science and Engineering, Seoul National University, Seoul, South Korea;2. Institute for Chemical Research, Kyoto University, Uji, Kyoto, Japan;3. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Nishi, Fukuoka, Japan;4. Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, South Korea |
| Abstract: | Inter‐ and intramolecular charge‐transfer processes are combined using an exciplex‐forming host and a thermally activated delayed fluorescent dopant, for fabricating efficient fluorescent organic light‐emitting diodes along with the reduced efficiency roll‐off at high current densities. Extra conversion on the host from triplet exciplexes to singlet exciplexes followed by energy transfer to the dopant reduces population of triplet excitons on dopant molecules, thereby reducing the triplet exciton annihilations at high current densities. |
| Keywords: | exciplex organic light‐emitting diodes thermally activated delayed fluorescence triplet exciton quenching |