Blue AIEgens bearing triphenylethylene peripheral: adjustable intramolecular conjugation and good device performance

The new approaches to construct deep blue aggregation-induced emission (AIE) materials have been explored, which control the conjugation by two different strategies, to make a great step for the commercialization of organic light-emitting diodes. In order to shorten the intramolecular conjugation length, triphenylethylene (tPE) was utilized to construct blue AIEgens as peripheral groups, instead of tetraphenylethylene (TPE), the famous AIE star molecule, to yield three blue AIEgens of 3,4-BtPE-PI, 4,4-BtPE-PI and 4,4-BtPE-PPI. Nondoped electroluminescence devices are fabricated by using these three AIEgens as the emitting material layer, the best performance of 3.8 cd/A as the maximum current efficiency achieved at the commission internationale de l'Eclairage coordinates of (0.17, 0.18).