同时掺杂磷光和荧光染料的白色有机电致发光器件性能研究

以磷光染料Ir(piq)₂(acac)作为发光掺杂剂，掺入空穴传输性主体材料NPB中得到红色发光层，荧光材料TBP掺入到主体CBP中作为蓝色发光层，制备了结构为ITO/NPB/NPB：Ir(piq)₂(acac)/CBP/CBP：TBPe/BCP/ALq/Mg：Ag的双发光层白色有机电致发光器件.其中ALq₃、未掺杂的NPB和CBP及BCP层分别作为电子传输层、空穴传输层和激子阻挡层.实验中通过调节发光层厚度及Ir(piq)_{2关键词： 磷光 激子阻挡层 有机电致发光}

A novel white organic electroluminescent device with both phosphorescent and fluorescent dopants

A double-layer white organic electroluminescent device was fabricated by using hole transporting material NPB doped with phosphoresecent dye Ir(piq)₂(acac) as red emitting layer and CBP doped with fluorescent dye TBPe as blue emitting layer. The configuration of this device was ITO/NPB/NPB：Ir(piq)₂(acac)/CBP/CBP：TBPe/BCP/Alq₃/Mg：Ag/Ag in which Alq₃，NPB(undoped)，CBP(undoped) and BCP films functioned as electron transporting layer，hole transporting layer and exciton blocking layer，respectively. White emission was be successfully achieved from the device with good EL performance by adjusting the thicknessess of light-emitting layers and the proportion of the dopants (TBPe，Ir(piq)₂(acac)). With a low turn-on voltage of 4.8V，it shows a maximum luminance of 7500cd/m² and external quantum efficiency of 1.24% at the driving voltage of 9V. Pure white light with Commission Internationale de l'Eclairage (CIE) coordinates of(0.33 0.30)was obtained at an applied voltage of 15V.