通过引入(NPB/MoO3)x/NPB作为空穴传输层,获得了低驱动电压的有机电致发光器件(OLEDs),(NPB/MoO3)x为多层结构(x为0,1和2)。通过对比发现,在相同亮度下,x=1对应的器件具有最低的工作电压。这是由于在NPB和MoO3之间产生了电荷转移复合物(charge transfer,CT),这将会降低器件的空穴注入势垒,从而降低其工作电压。文中所研究器件为基于8-羟基喹啉铝(tris(8-hydroxyquino-line)aluminum,Alq3)的绿光器件。与x=0时的普通器件相比,在亮度为1 000 cd.m-2时,x=1时的工作电压降低了0.8 V。 By introducing (NPB / MoO3) x / NPB as the hole transport layer, low driving voltages of organic electroluminescent devices (OLEDs) are obtained, with (NPB / MoO3) x being a multilayered structure (x is 0, 1 and 2) . By comparison, it is found that the device with x = 1 has the lowest operating voltage at the same brightness. This is due to the formation of a charge transfer (CT) transfer between NPB and MoO3 that will reduce the hole injection barrier of the device and reduce its operating voltage. The device studied in this article is a green device based on tris (8-hydroxyquino-line) aluminum, Alq3. The operating voltage at x = 1 is reduced by 0.8 V at a luminance of 1 000 cd.m-2 as compared to a normal device at x = 0.