Nano-organic Photoelectronic Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China.
Phys Chem Chem Phys. 2012 Nov 7;14(41):14255-61. doi: 10.1039/c2cp41542a.
Recently, bipolar host materials have attracted considerable attention because they can achieve balanced charge injection/transport in phosphorescent organic light emitting diodes (PhOLEDs) and consequently obtain excellent device performance. In this work, two bipolar host materials, namely, 3-(4,6-diphenyl-1,3,5-triazin-2-yl)-9-phenyl-9H-carbazole (DPTPCz) and 3-(4,6-diphenoxy-1,3,5-triazin-2-yl)-9-phenyl-9H-carbazole (DPOTPCz), have been designed, synthesized and characterized. With high triplet energy levels of 2.78 and 2.86 eV for DPTPCz and DPOTPCz, respectively, two compounds are considered promising bipolar host materials for PhOLEDs. Blue and green PhOLEDs based on these two new compounds show excellent performances. The phosphorescent devices based on DPTPCz exhibit maximum external quantum efficiencies of 14.4% (for blue device) and 21.2% (for green device), and maintain high efficiencies of 11.9% and 20.0% even at a high luminance of 10,000 cd m(-2).
最近，双极主体材料引起了相当大的关注，因为它们可以在磷光有机发光二极管（PhOLED）中实现平衡的电荷注入/传输，从而获得优异的器件性能。在这项工作中，设计、合成并表征了两种双极主体材料，即 3-(4,6-二苯基-1,3,5-三嗪-2-基)-9-苯基-9H-咔唑（DPTPCz）和 3-(4,6-二苯氧基-1,3,5-三嗪-2-基)-9-苯基-9H-咔唑（DPOTPCz）。DPTPCz 和 DPOTPCz 的三重态能级分别高达 2.78 和 2.86 eV，这两种化合物被认为是有前途的 PhOLED 双极主体材料。基于这两种新化合物的蓝色和绿色 PhOLED 表现出优异的性能。基于 DPTPCz 的磷光器件的最大外量子效率分别为 14.4%（蓝色器件）和 21.2%（绿色器件），即使在 10,000 cd/m²的高亮度下，仍保持 11.9%和 20.0%的高效率。
