[21a-W521-1~10] 12.4 Organic light-emitting devices and organic transistors

[21a-W521-9] ESR study of degradation mechanism of organic light-emitting diodes using Alq₃

〇(M1)Go Sato¹, Donghyun Son¹, Taisuke Ito¹, Kazuhiro Marumoto^1,2 (1.Division of Materials Science, Univ. of Tsukuba, 2.TIMS, Univ. of Tsukuba)

Keywords:OLED,ESR,degradation mechanism

The organic light-emitting diodes (OLEDs) have attracted much attention as a next generation display and light source because of their flexible device structure. The research and development of OLEDs have progressed, resulting in the commercialization in part. However, organic light-emitting materials and the device-operation mechanisms of OLEDs have not yet been completely understood. In this study, we have evaluated OLEDs with one of typical small molecule light-emitting materials Alq₃ using electron spin resonance (ESR) which can evaluate their characteristics at a molecular level. We compared the time evolution of ESR signals with that of the luminance of OLEDs to elucidate the degradation mechanisms of the device.