[18p-P08-1~18] 12.4 Organic light-emitting devices and organic transistors

[18p-P08-5] Characterization of exciplex upconversion OLED devices by displacement current measurement

〇(M1)HIikaru Nagahama¹, Masahiro Morimoto², Shigeki Naka² (1.Univ. of Toyama, 2.Faculty of Engineering, Univ. of Toyama)

Keywords:

organic electroluminescence,displacement current measurement,exciplex upconversion

Conventional OLED devices emit light by charge recombination in the light-emitting layer, which requires the application of a voltage equivalent to the energy gap of the emitting material. We have discovered the exciplex upconversion OLED (ExUC-OLED) as a strategy to reduce the voltage, which is achieved via triplet-triplet upconversion (TTU), but a detailed analysis of the operating mechanism has not been performed. In this study, the charge injection, transport, and accumulation processes of ExUC-OLEDs were evaluated using displacement current measurement (DCM) in order to elucidate the detailed operating mechanism of ExUC-OLEDs.