Zhang Heng, Wang Ziqi, Gao Long, Zhao Bo, Li Wenlian
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology Taiyuan 030024 P. R. China.
Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology Taiyuan 030024 P. R. China
RSC Adv. 2018 Jan 3;8(2):954-959. doi: 10.1039/c7ra11325k. eCollection 2018 Jan 2.
Pure fluorescent WOLEDs with low efficiency roll-off and high color stability were realized by employing an exciplex host. Due to incomplete energy transfer from the blue exciplex host of mCP : PO-T2T to the orange fluorescent dopant of rubrene, the WOLEDs showed a maximum current efficiency, power efficiency and EQE of 14.2 cd A, 12.8 lm W and 4.90%, respectively. To our surprise, a rather small roll-off ratio of 8.2% from the maximum EQE to the EQE at 1000 cd m and stable white light-emitting spectra with CIE coordinates of (0.384 ± 0.001, 0.439 ± 0.002) from 4 V to 8 V were obtained simultaneously. The bipolarity and triplet exciton up-conversion of the exciplex host played key roles in delivering excellent performance. More detailed discussions are also provided.
通过采用激基复合物主体实现了具有低效率滚降和高颜色稳定性的纯荧光白色有机发光二极管。由于从mCP : PO-T2T的蓝色激基复合物主体到红荧烯橙色荧光掺杂剂的能量转移不完全，白色有机发光二极管的最大电流效率、功率效率和外量子效率分别为14.2 cd/A、12.8 lm/W和4.90%。令我们惊讶的是，同时获得了从最大外量子效率到1000 cd/m²时外量子效率仅8.2%的相当小的滚降率，以及在4 V至8 V范围内CIE坐标为(0.384 ± 0.001, 0.439 ± 0.002)的稳定白光发射光谱。激基复合物主体的双极性和三重态激子上转换在实现优异性能方面发挥了关键作用。还提供了更详细的讨论。
