[8a-E308-1~7] 12.4 Organic light-emitting devices, organic transistors, and flexible devices

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[8a-E308-5] Analysis of operational orocesses in low-voltage-driven UC-OLEDs using electroluminescence and electrically detected ESR

〇Riku Fujiyoshi¹, Katsuichi Kanemoto^1,2 (1.Osaka Metropolitan Univ., 2.NITEP)

Keywords:

OLED,Triplet-Triplet Annihilation,ESR

In low-voltage-driven UC-OLEDs, triplet excitons are generated via CT pairs formed at the donor/acceptor interface and lead to light emission via TTA. Therefore, evaluating the spin states of the CT pairs formed during operation is crucial for understanding the operating mechanism of UC-OLEDs. In this study, we tracked the behavior of CT pairs based on the spectral characteristics obtained from luminescence-detected ESR, which measures changes in luminescence intensity during ESR, and current-detected ESR, which measures changes in current.