Abstract
A novel molecular host material, 3,5-di(9H-carbazol-9-yl)tetraphenylsilane (SimCP2), will be presented. By using this host, a blue electro- phosphorescent device with a record-high power efficiency of 24.2 Im/W and EQE of 17.7 % at 100 cd/m 2 with Commission Internationale de l'Eclairage coordinates of (0.18, 0.33) is obtained.