采用双极性材料4,4'-bis(carbazol-9-yl)biphenyl (CBP)为主体, 蓝色荧光染料N-(4-((E)-2-(6-((E)-4-(diphenylamino)styryl)naphthalen-2-yl)vinyl)phenyl)-N-phenylbenzenamine (N-BDAVBi)和橙色磷光染料Iridium(III) bis(4-phenylthieno［3,2-c］pyridinato-N,C2') acetylacetonate (PO-01)为客体, 制备了双发光层结构的白色有机电致发光器件, 通过调整发光层的位置及在两个发光层之间引入间隔层, 研究了器件的光电特性.间隔层的引入调整了发光层中激子的分布, 改善了器件的光电性能.器件的最大电流效率和功率效率分别为19.6 cd/A和12.3 lm/W.发光亮度从15 cd/m2增加至10 310 cd/m2的过程中, 器件的色坐标从(0.438, 0.476)变化至(0.316, 0.389), 始终处于白光区.

The white organic light-emitting diodes with dual-emitting layer structure were prepared, using bipolar material 4,4'-bis(carbazol-9-yl)biphenyl (CBP) as host, blue fluorescent materials N-(4-((E)-2-(6-((E)-4-(diphenylamino)styryl)naphthalen-2-yl)vinyl)phenyl)-N-phenylbenzenamine (N-BDAVBi) and orange phosphorescent materials Iridium(III) bis(4-phenylthieno［3,2-c］pyridinato-N,C2')acetylacetonate (PO-01) as dopant. The device structure was optimized by adjusting the position of the emitting layer and inserting a spacer between the two emitting layers, then the photoelectric properties of the device were studied. The OLEDs were characterized by combining fluorescent and phosphorescent materials as the emitting layers, and using the same material CBP as both the host and spacer. The addition of the spacer improved the performance of the OLEDs. The maximum current and luminous efficacy of the OLEDs were 19.6 cd/A and 12.3 lm/W, respectively. The color coordinates varied from (0.438, 0.476) to (0.316, 0.389) when the brightness increased from 15 to 10 310 cd/m2, always in white zone.