2023年第70回応用物理学会春季学術講演会

講演情報

一般セッション(口頭講演)

12 有機分子・バイオエレクトロニクス » 12.4 有機EL・トランジスタ

[15p-E402-1~18] 12.4 有機EL・トランジスタ

2023年3月15日(水) 13:00 〜 18:00 E402 (12号館)

中 茂樹(富山大)、中野谷 一(九大)、深川 弘彦(NHK技研)

14:30 〜 14:45

[15p-E402-7] Enhancing OLEDs Lifetime by Expanding CT Interface with TADF Assistant Dopant

〇(DC)Thanh Ba Nguyen1、Hajime Nakanotani1,2、Chihaya Adachi1,2 (1.Kyushu Univ.、2.WPI I2-CNER2)

キーワード:OLED, Interface, Lifetime

In organic light-emitting diodes (OLEDs), there is a possibility for the generation of an emissive singlet exciton through a process called triplet-triplet upconversion (TTU), in which two electrically generated triplet excitons combine, resulting in a singlet exciton generation efficiency of up to 62.5%. Despite the underlying mechanism is still debated, TTU has been shown to occur efficiently at a charge-transfer (CT) interface due to the dense generation of triplet excitons at the interface. However, confining all charge carriers at such an interface greatly inhibits the operational stability of OLEDs due to processes such as polaron-exciton annihilation and molecular degradation at the interface. In this study, we propose a novel OLED design utilizing thermally activated delayed fluorescence (TADF) materials to expand the CT interface.