Synthesis of 2-(3,5-diarylaminophenyl)-2H-benzo[d][1,2,3]triazoles with aggregation induced emission properties and its applications as a blue OLED component

In this study, a series of new fluorescent compounds ( 1a-1e ) were synthesized based on 2-phenylbenzotriazole acceptor and various diarylamine donors, and their photophysical properties in different states (solution, film, and powder) are investigated. Emissions of 1a-1e cover the spectrum from 413 nm to 572 nm in toluene solutions with various diarylamino donors on 2-phenylbenzotriazole. Among them, 1d and 1e exhibit the classical AIE properties while 1a, 1b and 1c show good emission in both solution and aggregated states. Additionally, all five compounds present large molar absorptivity (> 30000 L·mol ^-1 ·cm ^-1 ) and excellent emission efficiency. Thus, 2a has a molar absorptivity up to 65800 L·mol ^-1 ·cm ^-1 in toluene, while 1a shows the emissive efficiency up to 79.1%. Besides of these, mechanochromic properties were observed for compounds 1a, 1d and 1e , and blue OLEDs were fabricated by using compound 1b or 1c as the active layer.