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以苯乙烯类化合物BCzVB为蓝色荧光染料,以铱配合物Btp_2Ir(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%Btp_2Ir(acac),在．驱动电流从4～200 mA/cm~2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Btp_2Ir(acac)掺杂剂完全的能量传递、荧光染料BCzVB向磷光染料Btp_2Ir(acac)不完全的能量传递等内在物理过程和磷光染料Btp_2Ir(acac)自身发光饱和等特性共同决定的。
The white organic electroluminescent devices were prepared by using BCzVB as the blue fluorescent dye, Iridium complex Btp_2Ir (acac) as the red phosphorescent dye and co-doping into the CBP matrix as the light-emitting layer. The reason for the chromatic drift. The device is doped with CBP: 6% BCzVB: 0.2% Btp_2Ir (acac) at. Driving current ranged from 4 ~ 200 mA / cm ~ 2, the luminescent color coordinate shifted from (0.340,0.273) to (0.308, 0.273) with a slight blue shift in color coordinates. The analysis of the device luminescence spectra and the brightness-current density curve showed that the slight blue shift of the device’s color is due to the complete energy transfer from the CBP substrate to the Btp_2Ir (acac) dopant, the incomplete transfer of the fluorescent dye BCzVB to the phosphorescent dye Btp_2Ir (acac) Of the energy transfer and other intrinsic physical processes and phosphorescent dye Btp_2Ir (acac) own luminescence saturation and other characteristics of the decision.