Peng Ling, Yao Jing-Wen, Wang Mei, Wang Lin-Ye, Huang Xiao-Lan, Wei Xin-Feng, Ma Dong-Ge, Cao Yong, Zhu Xu-Hui
State Key Laboratory of Luminescent Materials and Devices, and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology (SCUT), Guangzhou 510640, China.
State Key Laboratory of Luminescent Materials and Devices, and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology (SCUT), Guangzhou 510640, China.
Sci Bull (Beijing). 2019 Jun 15;64(11):774-781. doi: 10.1016/j.scib.2019.04.029. Epub 2019 Apr 26.
It has been challenging to develop deep blue organic molecular fluorescent emitters with CIE y (y ≤ 0.08) based on triplet-triplet annihilation (TTA). Here, we report facilely available dianthracenylphenylene-based emitters, which have a 3,5-di(4-t-butylphenyl)phenyl moiety at the one end and 4-cyanophenyl or 3-pyridyl at the other end, respectively. Both fluorophores show a high glass transition temperature of over 220 °C with a thermal decomposition temperature of over 430 °C at an initial weight loss of 1%. The preliminary characterizations of the organic light-emitting diodes (OLEDs) that utilized these nondoped emitters provided high EQEs of 4.6%-5.9% with CIE coordinates (0.15, 0.07-0.08). The analysis of the EL transient decay revealed that TTA contributed to the observed performance. The results show that the new emitters are attractive as a potential TTA-based host to afford stable deep blue fluorescent OLEDs.
基于三重态-三重态湮灭（TTA）开发具有CIE y（y≤0.08）的深蓝色有机分子荧光发射体一直具有挑战性。在此，我们报道了易于获得的二蒽基苯撑基发射体，其一端分别具有3,5-二（4-叔丁基苯基）苯基部分，另一端分别具有4-氰基苯基或3-吡啶基。两种荧光团均显示出高于220°C的高玻璃化转变温度，在初始失重1%时热分解温度超过430°C。利用这些非掺杂发射体的有机发光二极管（OLED）的初步表征提供了4.6%-5.9%的高外量子效率，CIE坐标为（0.15, 0.07-0.08）。对电致发光瞬态衰减的分析表明，TTA对观察到的性能有贡献。结果表明，作为潜在的基于TTA的主体，新发射体对于提供稳定的深蓝色荧光OLED具有吸引力。
