All the attributes necessary for good OLED performance (see Figure), namely, high electroluminescence efficiency (5.4 cd A(-1)), long operational lifetime (10 000 h at an initial luminance of 100 cd m(-2)), and deep-blue color (color saturation: (0.14, 0.13)) are demonstrated by an OLED incorporating a novel, composite hole-transport layer and an emitter based on a new mono(styryl)amine dopant in the stable, anthracene-based blue host material, 2-methyl-9,10-di(2-naphthyl)anthracene.