研究了苯胺类化合物3DTAPBP(2,2’-二(3-二对甲苯基氨基苯基)联苯)的双分子激发态。 首先， 制备了3DTAPBP的单层有机发光二极管(OLED)： ITO/MoO3/3DTAPBP/LiF/Al， 其电致发光光谱中不仅含有3DTAPBP的单体激子发光(中心波长约420 nm， 蓝光)， 还观察到电致激基缔合物的发光(峰值为578 nm, 黄光)。 由单体发光和电致激基缔合物发光可以混合得到白光， 如： 7.0 V电压下， 3DTAPBP的单层器件的色坐标为(0.36, 0.31)， 器件结构非常简单。 不过由于单层器件中载流子注入和传输的严重不平衡， 亮度和效率极低。 此外， 在3DTAPBP与电子传输材料TPBi(1,3,5-三(1-苯基-1H-苯并咪唑-2-基)苯)构成的双层器件(ITO/MoO3/3DTAPBP/TPBi/LiF/Al)中， 由于载流子在界面处的堆积， 观察到3DTAPBP/TPBi界面处形成激基复合物发光(中心波长约490 nm)， 对应光子的能量和3DTAPBP与TPBi的HOMO(最高占有轨道)-LUMO(最低未占有轨道)能级差基本吻合。 对双层器件的电致发光光谱进行洛伦兹分解拟合， 发现随着电压的增加， 激基复合物发光减弱， 原因是更多的载流子越过3DTAPBP/TPBi界面势垒， 相应的3DTAPBP的单体激子发光逐渐增强。 4， 6和8 V驱动电压下， 双层器件的色坐标分别为(0.28, 0.35)， (0.24, 0.29)和(0.27, 0.28)， 随着驱动电压的增大， 发光颜色逐渐趋于白色。 双层器件的最高亮度和最大电流效率分别达1 349.2 cd·m-2， 1.22 cd·A-1。

The emission of bimolecular excited states was investigated in 3DTAPBP (2,2’-bis(3-(N,N-di-p-tolylamino) phenyl) biphenyl), which is one of aniline compounds. The emission of both monomer excitons (blue light centered at 420 nm) and electromer (yellow light peaked at 578 nm) was observed in the organic light emitting diode (OLED) fabricated with 3DTAPBP monolayer (ITO/MoO3/3DTAPBP/LiF/Al). A white OLED can be fulfilled by using the monomer exciton emission and the electromer emission, which is a very simple approach for achieving white OLED. For instance, a white light can be attained at 7.0 V in the device of ITO/MoO3/3DTAPBP/LiF/Al, with a Commission Internationale de l’clairage (CIE) color coordinates of (0.36, 0.31). However, the brightness and efficiency were extremely poor because of the serious imbalance of carrier injection and transport in the single layer device. In addition, a bilayer device (ITO/MoO3/3DTAPBP/TPBi/LiF/Al) were fabricated with 3DTAPBP and the electron transport material TPBi (1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl) benzene). The emission peaked at around 490 nm, originating from exciplex formed at 3DTAPBP/TPBi interface, which was observed due to the accumulation of carriers at the interface. The energy of the photons is generally in agreement with the energy difference between HOMO (the highest occupied molecular orbital) of 3DTAPBP and LUMO (the lowest unoccupied molecular orbital) of TPBi. The decomposition of electroluminescent spectra with Lorentzian fitting exhibited found that the intensity of exciplex emission decreased with the increase of voltage. The reason is that more carriers tunnel cross the interface barrier of 3DTAPBP/TPBi, resulting in the increase of monomer emission of 3DTAPBP. Under the application of voltages at 4, 6, and 8 V, the color coordinates were respectively (0.28, 0.35), (0.24, 0.29), and (0.27, 0.28). And the luminous color was within the range of white at a voltage of 8 V. The highest brightness and maximum current efficiency of bilayer devices were 1 349.2 cd·m-2 and 1.22 cd·A-1, respectively.