In this paper, blue thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) have been elucidated, with a focus on the degradation characteristics of the emission layer (EML). The operational stability against electrical stress was investigated for two host materials and four doping concentrations, which were used as the EML. The operating stability of the devices was confirmed by comparing the peak capacitance before and after degradation. Devices using bis [2-(diphenyl-phosphino) phenyl] ether oxide (DPEPO) as a host exhibited poor degradation characteristics. However, high stability was confirmed when 3,3-di (9H-carba-zol-9-yl)-biphenyl (mCBP) was used. DPEPO host devices are most resistant against performance degradation when they are doped with 10 wt% 10,10'-(4,4′-sulfonylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine (DMAC-DPS). We successfully determined the electroluminescence characteristics of the device depending on the host material, as well as the doping concentration, using the capacitance–voltage method.

在本文中，已经阐明了蓝色热激活延迟荧光 (TADF) 有机发光二极管 (OLED)，重点是发射层 (EML) 的降解特性。针对用作 EML 的两种主体材料和四种掺杂浓度研究了针对电应力的操作稳定性。通过比较退化前后的峰值电容来确认器件的运行稳定性。使用双 [2-(二苯基-膦基) 苯基] 醚氧化物 (DPEPO) 作为主体的器件表现出较差的降解特性。然而，当使用 3,3-二 (9H-carba-zol-9-yl)-联苯 (mCBP) 时，证实了高稳定性。当 DPEPO 主机器件掺杂 10 wt% 10,10'-(4,4'-磺酰基双(4,1-亚苯基))双(9,9-二甲基-9)时，它们最能抵抗性能下降，10-二氢吖啶 (DMAC-DPS)。我们使用电容-电压方法成功地确定了取决于主体材料和掺杂浓度的器件的电致发光特性。