High-performance blue electroluminescent devices based on hydroxyphenyl-pyridine beryllium complex

Blue light organic electroluminescent (EL) devices with high-performance were fabricated by using a highly fluorescent material, bis[2-(2-hydroxyphenyl)-pyridine]beryllium $({\mathrm{Bepp}}_{\mathrm{2}}\mathrm{).}$ The double layer devices with a structure of [indium tin oxide/N, N^′-di(α-naphthyl)-N-N^′-diphenyl(1, 1^′-biphenyl)-4, 4^′-diamine $\text{(600\hspace{0.05em}Å)/}{\mathrm{Bepp}}_{\mathrm{2}}$ (500 Å)/LiF (10 Å)/Al (2000 Å)] exhibited a maximum luminance of 15 000 cd/m² and a maximum electroluminescent efficiency of 3.43 lm/w (3.8 cd/A).