[14a-PB6-1~17] 12.2 Characterization and Materials Physics

[14a-PB6-6] Direct observation of exciton dynamics of TADF neat film using time-resolved photoemission electron microscopy

〇(M1)Yusuke Fukami¹, Masato Iwasawa¹, Masahiro Sasaki¹, Keiki Fukumoto², Yoichi Yamada¹ (1.Tsukuba Univ., 2.KEK)

Keywords:Thermally activated delayed fluorescence, Time-resolved photoemission spectroscopy, exciton dynamics

Nowadays, OLEDs using a neat film of thermally activated delayed fluorescence (TADF) molecules have attracted attention. It is expected that control of molecular orientation and elucidation of exciton properties improve the efficiency. In this study, we performed time-resolved photoemission spectroscopy experiments on a neat film of TADF molecule (4CzIPN) , and estimated the timescale of radiative deactivations of TADF neat film by directly tracing the electron motion with energy resolution.