【摘要】 以苯乙烯类化合物BCzVB为蓝色荧光染料,以铱配合物Btp₂Ir（acac）为红色磷光染料,共掺杂到CBP基质中作为发光层,制备了白色有机电致发光器件,研究了该体系发光色度漂移的原因。器件在掺杂CBP:6%BCzVB: 0．2%Btp₂Ir（acac）,在．驱动电流从4～200 mA/cm²变化范围内,发光色坐标从（0．340,0．273）飘移到（0．308, 0．273）,色坐标轻微蓝移。对器件发光光谱和亮度-电流密度曲线等分析表明:器件色度的轻微蓝移是由于CBP基质向Btp₂Ir（acac）掺杂剂完全的能量传递、荧光染料BCzVB向磷光染料Btp₂Ir（acac）不完全的能量传递等内在物理过程和磷光染料Btp₂Ir（acac）自身发光饱和等特性共同决定的。更多还原

【Abstract】 White organic electroluminescence devices （OLEDs） were fabricated,with BCzVB as blue luminescence dye and Btp₂ Ir（acac） as red phosphorescence dye doped into CBP substrate as the light-emitting layer.The reason for the system color-coordinate shift is explored.For the device with the doping mass fraction of 6% BCzVB and 0.2% Btp₂ Ir（acac）,the color-coordinate shifts slightly from （0.340,0.273） to（0.308,0.273）,when the driving current varies from 4 to 200 mA/cm².The reason of the slight blue shift is derived by the luminescence spectrum and luminance-current density curve.It is found that internal physical processes,such as the complete energy transfer from host CBP to dopant Btp₂ Ir（acac） and incomplete energy transfer from blue dye of BCzVB to red dye of Btp₂ Ir （acac）,and luminesence saturation of phosphorescent dye of Btp₂ Ir（acac） determine the slight blue shift.更多还原