Efficient soluble deep blue electroluminescent dianthracenylphenylene emitters with CIE y (y ≤ 0.08) based on triplet-triplet annihilation

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2019,（11）
• 页码范围: 774-781
• 页数: 8页
• 语种: 英文

摘要

It has been challenging to develop deep blue organic molecular fluorescent emitters with CIEy (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 ℃ with a thermal decomposition temperature of over 430 ℃ 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 ClE 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.