Structural Controls of Tetraphenylbenzene-based AIEgens for Non-doped Deep Blue Organic Light-emitting Diodes

Aggregation-induced emission(AIE) has emerged as a new concept, giving highly efficient solid-state photoluminescence. Particularly, AIE luminogens(AIEgens) with deep blue emission(400–450 nm) have displayed salient advantages for non-doped organic light-emitting diodes(OLEDs). However, deep blue emitters with Commission Internationale de L’Eclairage(CIE) coordinates less than 0.08 are still rare. In this review, we outline the latest achievements in the molecular guidelines based on the AIE core of tetraphenylbenzene(TPB) for developing efficient deep blue AIEgens. We provide insights into the construction of deep blue emitters with high horizontal orientation by regulating the length of the linear molecule. We also discuss the luminescence mechanisms of these AIEgens-based OLEDs by using the magnetic field effects measurements. Finally, a summary of the challenges and perspectives of deep blue AIEgens for non-doped OLEDs is also presented.