| 학회 |
한국고분자학회 |
| 학술대회 |
2007년 가을 (10/11 ~ 10/12, 일산킨텍스) |
| 권호 |
32권 2호 |
| 발표분야 |
분자전자 소재 및 소자 기술(분자전자 부문위원회) |
| 제목 |
High efficiency phosphorescent organic light emitting diodes |
| 초록 |
Quantum efficiency of phosphorescent light emitting diodes (PhOLEDs) has been reported to be reduced with increasing current density and its origin has been attributed to the triplet-triplet annihilation coming from long lifetime of triplet excitons, electric field induced dissociation of excitons and triplet-polaron annihilation. Based on emission spectra and exciton lifetimes vs. current density in Ir(ppy)3 doped PhOLEDs, however, we report that the roll-off of the quantum efficiency at high current density is related to the exciton formation in the hole transporting layer especially at below 10 mA/cm2.By confining the exciton formation zone in the emitting layer we could get high performance PhOLEDs with the external quantum efficiency over 20%. |
| 저자 |
Jang-Joo Kim |
| 소속 |
Department of Materials Science and Engineering |
| 키워드 |
phosphorescent organic light emitting diodes |
| E-Mail |
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