基于双极性小分子的单层非掺杂红色荧光有机发光二极管(英文)

以双极性小分子4,9-二(4-(2,2-二苯乙烯基)苯基)萘并2,3-c]1,2,5]噻二唑(BDPNTD)为发光层,制备得到了单层非掺杂红色荧光有机发光二极管.通过在阳极ITO与有机层BDPNTD之间插入1nm厚的WO3或MoO3薄膜,获得了单层有机发光二极管:起亮电压为2.4V,最大发光亮度为4950cd·m-2,发光波长为636nm,CIE坐标约为(0.65,0.35).这证明了作为修饰层的WO3或MoO3薄膜可以改进ITO/BDPNTD界面的空穴注入,进而在器件中实现空穴与电子的平衡.

Non-doped Single-Layer Red-Emitting Electrofluorescent Devices Based on an Ambipolar Small Molecule

Non-doped red-emitting electrofluorescent single-layer organic light-emitting devices based on an ambipolar small molecule, 4,9-bis(4-(2,2-diphenylvinyl)phenyl)naphtho2,3-c]l,2,5] thiadiazole (BDPNTD), were studied. A WO_3 or MoO_3 buffer layer with an optimized thickness of 1 nm was used and the single-layer device has a low turn-on voltage (2.4 V) and a high luminance (4950 cd·m~(-2)). The maximum emission wavelength was at about 636 nm and the CIE coordinates are at about (0.65,0.35). We confirmed that the WO_3 or MoO_3 buffer layer can improve hole injection at the ITO/ BDPNTD interface and it creates a hole-electron balance in these devices.