White organic electroluminescence based on a new boron complex

A bright blue boron complex BPh 2 (pybm) containing 2-(2-pyridyl)benzimidazole ligand was designed and synthesized by using N, N-bidentate ligand instead of N, O-bidentate one such as 8-quinolinol. For three-layer LED devices with the configuration of ITO/NPB/BPh 2 (pybm)/Alq 3 /LiF/Al, the white light emission covering the whole visible region from 400 to 750 nm with the maximum brightness of 110 cd/m 2 and the luminous efficiency of 0.8 cd/A was observed.