[16p-Z18-1~11] 12.4 Organic light-emitting devices and organic transistors

[16p-Z18-4] Operando ESR spectroscopy study of charge/spin states in blue light-emitting electrochemical cells with triplet-triplet annihilation

〇Haruka Tozawa¹, Kaho Komura¹, Junya Katsumata¹, Daisuke Fukushima², Nozomi Kogure², Akinori Bando², Hiroshi Hamamatsu², Yukihiro Shimoi³, Kazuhiro Marumoto^1,4 (1.Univ. Tsukuba, 2.SCC, 3.AIST, 4.TREMS, Univ. Tsukuba)

Keywords:Electron Spin Resonance, Light-emitting Electrochemical Cell, Triplet-Triplet Annihilation

In this study, we attempted to identify the doping process by changing the materials used for the light-emitting polymer in the luminescent electrochemical cell (LEC). The LECs were fabricated using Host polymer and triplet-triplet annihilation (TTA) polymer as the luminescent polymers, and the long-lived charge states during drive were studied from a microscopic point of view by operando electron spin resonance (ESR) spectroscopy. As a result, we have observed ESR signals that are derived from the luminescent polymer in each of the three types of LECs and identified the doping process for each LEC.