Starburst materials, 1,3,5-tris[3,5-bis(pyrid-4-yl)phenyl]benzene (1a) and 1.3,5-tris[3,5-bis(pyrid-3-yl)phenyl]benzene (1b) were designed and synthesized. By using fac-tris(2-phenylpyridyl)iridium(III) [Ir(ppy)(3)] as a green emitter and I as an electron-transporting material, a green OLED was fabricated. The OLED exhibited a maximum power efficiency (PE) of 96 lm W-1 with ail external quantum efficiency (EQE) of 23% at 2.1 cd m(-2), and a PE of 75 lm W-1 with an EQE of 23% Lit 100 cd m(-2).