Key parameters of exciplex emission energy and efficiency were elucidated by synthesizing two electron donor type hosts derived from carbazole and diphenylamine. The two hosts were mixed with an electron acceptor type host to make exciplexes. Investigation of the exciplex emission characteristics revealed that the distance between the HOMO of the donor type host and the LUMO of the acceptor type host is critical to the emission energy and efficiency. The exciplex which has short intermolecular distance between HOMO and LUMO showed low emission energy and high device efficiency possibly due to strong exciton binding and extensive HOMO-LUMO overlap. Therefore, it was found that intermolecular HOMO and LUMO distance is also a key factor affecting the device performances of exciplexes.

通过合成两种衍生自咔唑和二苯胺的电子供体型主体，阐明了激基复合物发射能和效率的关键参数。将两个主体与电子受体型主体混合以形成激基复合物。对激基复合物发射特性的研究表明，供体型宿主的HOMO与受体型宿主的LUMO之间的距离对发射能量和效率至关重要。在HOMO和LUMO之间的分子间距离短的激基复合物显示出低的发射能量和高的器件效率，这可能是由于强的激子结合和广泛的HOMO-LUMO重叠。因此，发现分子间HOMO和LUMO距离也是影响激基复合物的器件性能的关键因素。