Choi Geun Su, Kang Byunghyun, Choi Jinnil, Ju Byeong-Kwon, Park Young Wook
Nano and Organic-Electronics Laboratory, Department of Display and Semiconductor Engineering, Sun Moon University, Asan, Chungcheongnam-do, 31460, Republic of Korea.
Display and Nanosystem Laboratory, School of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
J Nanosci Nanotechnol. 2020 Nov 1;20(11):6679-6682. doi: 10.1166/jnn.2020.18770.
The phenomenon by which the efficiency decreases rapidly with the increase in luminance or current density in organic light-emitting diodes is termed efficiency roll-off. In particular, phosphorescent organic light-emitting diodes are known to have higher efficiency, but tend to exhibit higher efficiency roll-off compared with fluorescent organic light-emitting diodes. In this study, we report the efficiency roll-off characteristics of double-dopant phosphorescent organic light-emitting diodes. The double-dopant phosphorescent organic light-emitting diodes showed significantly lower efficiency roll-off compared with single-dopant phosphorescent organic light-emitting diodes. (The double-dopant device showed a 2.5-fold decrease in efficiency roll-off compared with the single-dopant device at 50 mA/cm², and a 1.6-fold decrease in efficiency roll-off at 100 mA/cm²).
随着有机发光二极管中亮度或电流密度的增加，效率迅速下降的现象被称为效率滚降。特别是，磷光有机发光二极管已知具有更高的效率，但与荧光有机发光二极管相比，往往表现出更高的效率滚降。在本研究中，我们报告了双掺杂磷光有机发光二极管的效率滚降特性。与单掺杂磷光有机发光二极管相比，双掺杂磷光有机发光二极管的效率滚降显著更低。（在50 mA/cm²时，双掺杂器件的效率滚降比单掺杂器件降低了2.5倍，在100 mA/cm²时降低了1.6倍）
