笹部研究室の D3 蒋德豪 (Jiang Dehao) 君の「高色純度多重共鳴型TADF発光材料のための新しいマトリックスフリーハイパー有機EL技術」に関する論文が Wiley の Advanced Materials (IF: 27.4) に受理されました！本研究は山形大学片桐研究室と横山研究室との共同研究です。

A novel matrix-free hyperfluorescent system based on anti-quenching TADF host for high color purity MR-TADF emitters
By Dehao Jiang, Hisahiro Sasabe,* Yuhui Chen, Yuki Sagae, Hiroki Sato, Daisuke Yokoyama, Hiroshi Katagiri, and Junji Kido*, Adv. Mater. accepted.

Abstract: Organic light-emitting diodes (OLEDs) based on hyperfluorescent system have attracted widespread attention due to their ability to simultaneously achieve improvements in efficiency, lifetime and color purity by combining the advantages of high exciton utilization sensitizers and high-color purity emitters. Traditional hyperfluorescent systems typically involve three or four components and are severely sensitive to the doping concentration (~0.5 wt%) of terminal emitter, which inevitably causes to high costs and difficulties in reproducibility. Here, we propose a novel design concept for matrix-free hyperfluorescent (MFHF) system that employs a combination of an anti-quenching TADF host and a high color purity MR-TADF emitter. This strategy allows traditional concentration-sensitive MR-TADF emitters to significantly improve exciton utilization and reduce exciton lifetime at high doping levels, without the need for complex molecular modifications. The OLEDs with binary emissive layer achieve pure- green emission, a maximum external quantum efficiency of over 30% and a high maximum power efficiency of 145 lm W−1. Our approach offers a straightforward and universal method to achieve anti-quenching matrix-free hyperfluorescent OLEDs with high color purity, making them promising for commercial applications in low-cost ultra- high-definition (UHD) displays.

https://hisahirosasabe.yz.yamagata-u.ac.jp/archives/412