Resonance hosts for high efficiency solution-processed blue and white electrophosphorescent devices

• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2020,（11）
• 所属期刊栏目: ARTICLES
• 页码范围: 1645-1651
• 页数: 7页
• 语种: 英文

摘要

The exploration of high-performance solution-processible host materials for blue and white electrophosphorescent devices is a key and fundamental challenge in the ongoing development of organic semiconductors.Herein,two solution-processible resonance host materials with self-adaptive characteristics are delicately designed and constructed.Because of the dynamic tautomerization upon resonance variation,these smart hosts show self-adaptive and selectively enhanced charge carrier flux at high triplet energy levels.Conferred by the resonance molecules,solution-processed blue and white devices exhibit excellent maximum current efficiencies (CEs) of 29.8 and 57.3 cd A-1,and external quantum efficiencies (EQEs) up to 14.5％ and 23.5％,respectively.Our works highlight the significant progress of the solution-processed phosphorescent organic light-emitting diodes(PhOLEDs) using resonance host molecules,potentially furnishing a leap forward in constructing advanced organic semiconductors for next-generation optoelectronic devices.