大电流驱动下色度稳定的白色有机电致发光器件  被引量:1

White Organic Electroluminescent Devices with Color-coordinate Stability under Large Driven Currents

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作  者:张晓波[1] 委福祥[1] 刘向[1] 朱文清[1] 蒋雪茵[1] 张志林[1] 

机构地区:[1]上海大学材料科学与工程学院,上海嘉定201800

出  处:《半导体光电》2006年第6期707-711,716,共6页Semiconductor Optoelectronics

基  金:国家"973"计划资助项目(2002CB613400);国家自然科学基金项目(90201034;60477014;60577041)

摘  要:制备了蓝光染料BCzVB和红光染料Btp2Ir(acac)共掺杂的白色有机电致发光器件。保持蓝光染料掺杂浓度为69/6而将红光染料掺杂浓度从6%,3%,1%减小到0.2%,器件色坐标从(0.60,0.35)调整至(0.55,0.34),(0.45,0.30)和(0.34,0.27),实现了白光发射。并且,器件在驱动电流4~200mA/cm^2变化范围内,发光色坐标稳定,几乎不随驱动电流密度的增大而漂移。对器件发光光谱和亮度-电流密度曲线等分析表明:器件色度的稳定性是由CBP基质向Btp2Ir(acac)掺杂剂完全的能量传递、蓝光染料BCzVB向红光染料Btp2Ir(acac)不完全的能量传递等内在物理过程决定的。White organic electroluminescent devices (OLEDs) are constructed with a structure of ITO//NPB/CBP:BCzVB: Btp2Ir(acac)/BAlq/Alq/LiF/Al. Keeping the blue dye BCzVB dopant concentration of 6% and decreasing the red dye dopant concentration of from 6 %, 3%, 1% to 0.2%. The color coordinates change from (0.60, 0.35) to (0.55, 0.34), (0.45, 0. 30) and (0.34,0.27). And color coordinates of these devices remains unchanged with driven current density range from 4 mA/cm^2 to 200 mA/cm^2. The reason of the chromaticity stability has been discussed in detail. It is found that the color purity stability of devices are jointly determined by complete energy transfer from host CBP to dopant Btp2Ir(acac) and incomplete energy transfer from blue dye of BCzVB to red dye of Btp2Ir(acac).

关 键 词:色度 大电流驱动 白色有机电致发光器件 能量传递 

分 类 号:TN873.3[电子电信—信息与通信工程]

 

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