Realization of ultra‐high‐efficient fluorescent blue OLED

作者：Satomi Tasaki, Kazuki Nishimura, Hiroaki Toyoshima, Tetsuya Masuda, Masato Nakamura, Yuki Nakano, Hiroaki Itoi, Emiko Kambe, Yuichiro Kawamura, Hitoshi Kuma · 发表于：Journal of the Society for Information Display · 年份：2022 · DOI：10.1002/jsid.1127 · 被引用次数：48 · 研究领域：Organic Light-Emitting Diodes Research、Organic Electronics and Photovoltaics、Conducting polymers and applications

Abstract The bilayer structure for an emitting layer (EML) was developed to improve performances of a fluorescence blue organic light emitting diode. By functionally separating the EML into the charge recombination and the triplet–triplet fusion (TTF) zone, we successfully suppressed the quenching of triplet excitons by excess carriers to make more TTF efficient and the local degradation within the EML to make the lifetime longer. In the bottom emission device with the bilayer EML, 12% of external quantum efficiency (EQE) and 450 h of LT95 were achieved. Furthermore, we achieved over 14% of EQE by optimizing the material combinations.