Stable styrylamine-doped blue organic electroluminescent device based on 2-methyl-9,10-di(2-naphthyl)anthracene

We have developed a highly efficient and stable blue organic electroluminescent (EL) device based on a blue fluorescent styrylamine dopant, $p$ -bis($p\text{-}N,N$ -diphenyl-aminostyryl)benzene, in a morphologically stable high band-gap host material, 2-methyl-9,10-di(2-naphthyl)anthracene, which achieved an EL efficiency of $9.7\mathrm{cd}∕\mathrm{A}$ and $5.5\mathrm{lm}∕\mathrm{W}$ at $20\mathrm{mA}∕{\mathrm{cm}}^2$ and 5.7 V, with Commission Internationale d’Eclairage coordinates of $(x=0.16,y=0.32)$ . The blue-doped device achieved a half-decay lifetime $\left(t_{1∕2}\right)$ of 46 000 h at an initial brightness of $100\mathrm{cd}∕{\mathrm{m}}^2$ .