Reducing intersystem crossing rates of boron emitters for high-efficiency and long-lifetime deep-blue OLEDs

An external quantum efficiency of 6.7% and a long operational lifetime of 136 h at 1000 cd m −2 were simultaneously realized for organic light-emitting diodes based on the deep-blue boron emitter (B-N-S-3), owing to the reduced intersystem crossing rate of the emitter.