Organic light-emitting devices with E-type delayed fluorescence emitters

Organic light-emitting diodes (OLEDs) possess extremely attractive properties such as highly efficient electroluminescence (EL), good flexibility, light weight, and the possibility of solution processing and low-cost manufacture, making them fascinating for advanced flexible displays and lighting. Since the recombination of four holes and electrons yields one singlet exciton and three triplet excitons based on the rules of spin statistics in organic semiconductors, exciton production efficiency in organic semiconductors under electrical excitation is a crucial parameter for realizing high-performance OLEDs. In this talk, our recent work on the manipulation of spin-flip processes in molecular systems exhibiting E-type delayed fluorescence toward to the realization of 100% internal EL quantum efficiency will be discussed.