A composition formed of a first mixture of a first compound and a second compound wherein the first compound has different chemical structure than the second compound; the first compound is capable of functioning as a hole transporting material in an organic light emitting device at room temperature; the first compound comprises at least one carbazole group; the first compound has a evaporation temperature T1 of 150 to 350 °C; the second compound has evaporation temperature T2 of 150 to 350 °C; the absolute value of T1-T2 is less than 20 °C; the first compound having a concentration C1 in said first mixture, and the first compound having a concentration C2 in a film formed by evaporating the first mixture in a vacuum deposition tool at a constant pressure between 1x10-6 Torr to 1x10-9 Torr, at a 2Å/sec deposition rate on a surface positioned at a predefined distance away from the mixture being evaporated; and wherein the absolute value of (C1-C2)/C1 is less than 5%.
一种由第一种化合物和第二种化合物的第一种混合物形成的组合物,其中第一种化合物与第二种化合物具有不同的
化学结构;第一种化合物能够在室温下在有机发光器件中用作空穴传输材料;第一种化合物包含至少一个
咔唑基团;第一种化合物的蒸发温度T1为150至350 °C;第二种化合物的蒸发温度T2为150至350 °C;T1-T2的绝对值小于20 °C;第一化合物在所述第一混合物中的浓度为C1,而第一化合物在薄膜中的浓度为C2,该薄膜是在真空沉积工具中,在1x10-6托至1x10-9托的恒定压力下,以2埃/秒的沉积速率将第一混合物蒸发在与被蒸发的混合物保持预定距离的表面上形成的;其中(C1-C2)/C1的绝对值小于5%。