| 학회 |
한국고분자학회 |
| 학술대회 |
2017년 가을 (10/11 ~ 10/13, 제주컨벤션센터) |
| 권호 |
42권 2호 |
| 발표분야 |
분자전자 부문위원회 II |
| 제목 |
Degradation Mechanism of Blue-Phosphorescent Organic Light-Emitting Devices |
| 초록 |
Chemical degradation is responsible for short lifetimes of organic light-emitting devices. However, the molecular mechanism by which degradation initiates has yet to be fully understood to date. We investigated exciton-mediated formation of a radical ion pair between a wide bandgap host and a series of blue-phosphorescent Ir(III) complexes. Electrochemical studies predicted an occurrence of reductive electron transfer from dopants to host exciton to form a radical ion pair. A variety of spectroscopic techniques were employed to monitor the generation and annihilation of the radical ion pair. We found a linear correlation between device lifetimes and rate constants for charge recombination. Analyses of degradation byproducts indicated breakage of C-N bonds in both radical ion species, prior to charge recombination. Our findings demonstrate the importance of controlling exciton-induced electron transfer within an emitting layer, and enable novel strategies to improved device longevity. |
| 저자 |
유영민1, 김신희1, 인수강2, 노창호2, 김성한2, 배혜진2, 박상호2, 김중혁2, 김종수2, 정용식2, 설수환2
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| 소속 |
1이화여자대, 2삼성전자 |
| 키워드 |
OLED; degradation; polaron pair; radical ion
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| E-Mail |
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