We report a new efficient exciplex-forming system consisting of a biscarbazole donor and a triazine-based acceptor. The new exciplex was characterized with a high photoluminescence quantum yield up to 68% and effective thermally activated delayed fluorescence behavior. The BCzPh:3P-T2T (2:1, 30 nm) blend was examined not only as an emitting layer (device D1) but also a reliable co-host of fluorescent and phosphorescent emitters for giving highly efficient exciplex-based organic light-emitting diodes (OLEDs) with a high maximum external quantum efficiency of 15.5 and 29.7% for devices doped with 1 wt % C545T (device D2) and 8 wt % Ir(ppy)₂(acac) (device D4), respectively. More strikingly, a strongly enhanced lifetime (T₇₅ = 16 927 min.) of the C545T-doped device was obtained. The transient electroluminescence measurement as well as capacitance–voltage and impedance–voltage correlations were utilized to explore the factors governing the high efficiency and stability. The obtained results clearly show that the energy transfer and charge transport is highly efficient; they also show the photoelectric semiconducting characteristics of exciplex-based OLEDs, which are significantly different from those of unipolar host-based reference devices D3 (Alq₃: 1 wt % C545T) and D5 (CBP: 8 wt % Ir(ppy)₂(acac)). Our works have established a systematic protocol to shed light on the mechanisms behind exciplex-based devices. The combined results also confirm the bright prospect of the exciplex-forming system as the co-host for highly efficient and stable OLEDs.

中文翻译：

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多功能激基形成共基质，可提高荧光和磷光有机发光二极管的效率和寿命

我们报告了由双咔唑供体和基于三嗪的受体组成的新型高效的激基复合物形成系统。新的激基复合物的特征是具有高达68％的高光致发光量子产率和有效的热激活延迟荧光行为。不仅检查了BCzPh：3P-T2T（2：1，30 nm）共混物作为发光层（器件D1），而且还检查了可靠的荧光和磷光发光体共宿主，以提供高效的基于激基复合物的有机发光体对于分别掺杂1 wt％C545T（器件D2）和8 wt％Ir（ppy）₂（acac）（器件D4）的器件，最大外部量子效率分别为15.5和29.7％的高密度二极管（OLED）。更显着的是，使用寿命大大提高（T ₇₅（＝ 16927min。）获得了掺杂C545T的器件。瞬态电致发光测量以及电容-电压和阻抗-电压的相关性被用来探索控制高效率和稳定性的因素。所得结果清楚地表明，能量转移和电荷转移是高效的。它们还显示了基于激基复合物的OLED的光电半导体特性，这与基于单极性主体的参考器件D3（Alq ₃：1 wt％C545T）和D5（CBP：8 wt％Ir（ppy）₂）的光电半导体特性显着不同。（acac））。我们的工作建立了系统的协议，以阐明基于激基复合物的装置背后的机制。组合结果也证实了激基复合物形成系统作为高效稳定的OLED的共同宿主的光明前景。