Highly Efficient Green Phosphorescent OLED Based on Pyridine-containing Starburst Electron-transporting Materials

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Abstract
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 1 as an electron-transporting material, a green OLED was fabricated. The OLED exhibited a maximum power efficiency (PE) of 96 lm W−1 with an 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% at 100 cd m−2.