Study on the origin of behaviors of triplet excitons, and transient characteristics in organic light-emitting and photodetector devices

研究了有机磷光发光二极管(OLED)的瞬时电致发光。用三重态-三重态湮没模型分析了其暂态特性。用阻抗谱分析了改进后的OLED器件参数。为了提高聚合物光电探测器(PD)的转换效率，研究了掺Ir(Ir)和掺铂(Pt)络合物的聚合物光电探测器的性能。当荧型聚合物的三重态能级低于主体的最低激发单态，高于主体的最低激发三重态时，三重态材料可以提高器件的入射光子到电流的转换效率。我们证明了双层聚合物PDS可以应用于短距离光通信领域，例如用于光链路的光电转换设备。

The transient electroluminescence (EL) of phosphorescent organic light-emitting diodes (OLEDs) was investigated. The behaviors of the transient characteristics are analyzed using the triplet-triplet annihilation model. The improved devices parameters of OLEDs are analyzed by impedance spectroscopy. To improve the conversion efficiency of polymer photodetectors (PDs), the properties of polymer photodetectors doped with iridium (Ir) and platinum (Pt) complexes were investigated. Triplet materials can enhance the incident-photon-to-current conversion efficiency of the devices utilizing the fluorene-type polymers when their triplet levels are lower than the lowest excited singlet states of the host and higher than the lowest excited triplet states of the host. We demonstrate that the bilayer polymer PDs can be applied to short-range optical communication fields, such as opto-electrical conversion devices for optical links.