利用BCP层调节白色磷光有机电致发光器件色度的研究

制备了三种结构的白色有机电致发光器件，通过比较得出：在发光层中间插入2，9-二甲基-4，7-二苯基-1，10-菲咯啉(BCP)能有效控制载流子在不同发光层的分布，进而对器件色度进行调节；而掺杂磷光染料Ir(ppy)₃作敏化剂能有效提高器件的效率. 结构为:氧化铟锡/聚乙烯基咔唑∶N，N′-二(1-萘基)-N，N′-二苯基-1，1′-联苯-4-4′-二胺(30nm)/二-(2-甲基-8-羟基喹啉)-4-联苯酚铝：3.0 wt%2，5，8，11-tetra-tertbutylperylene(TBPe)(30nm)/BCP(5.0nm)/4,4N,N二咔唑基二苯：5.0 wt%Ir(ppy)₃:2.0 wt%红荧烯(15nm)/BCP(10nm)/Mg:Ag的器件色度和效率俱佳. 其在17V工作电压下具有的亮度为4670cd/m²，对应色坐标为(0.31,0.37). 器件具有的最大外量子效率为1.4%，当驱动电压从5.0V升高到17V，器件色坐标严格位于白光色域区内. 关键词： 磷光染料 阻挡层 白光 双发光层

Using BCP layer to control the chroma of white phosphorescent organic light-emitting device

Three types of double emitting layer white organic light-emitting devices (POLEDs) were fabricated. The efficiency of the device can be increased largely by the introduction of phosphorescent dye (Ir(ppy)₃) and the chroma of the device can be tuned by inserting a BCP layer between the two light-emitting layers. The device with the configuration of: ITO/PVK:NPB (30nm)/BALq:3.0 wt%TBPe(30nm)/BCP(5.0nm)/CBP:5.0 wt%Ir(ppy)₃:2.0 wt%rubrene(15nm)/BCP(10nm)/Mg:Ag shows white emission and high efficiency. A white light with Commission Internationale de l'Eclairage (CIE) coordinates of (0.31, 0.37) and brightness of 4670 cd/m² are obtained at 17V. The device shows a maximum external efficiency of 1.4%. The CIE coordinates are well within the white-light region when the applied voltage varies between 5.0 to 17V.