The strategy to co-deposit copper halide and organic materials to directly generate emissive copper complexes is taken into account as a straightforward and promising way to fabricate organic light-emitting diodes (OLEDs) compared with using presynthesized complexes. In this work, four aza-9,9-Spirobifluorenes (aza-SBFs) with the nitrogen atom at different positions of azafluorene moiety were co-deposited with copper(I) iodide (CuI) to form emissive complexes. Intriguingly, we found that the emission properties of these co-deposited copper complexes contain phosphorescent and thermally activated delayed fluorescent (TADF) characteristics. Through changing the position of nitrogen atom, the TADF process can be effectively enhanced, resulting in PLQY up to 92.2 %. Consequently, green OLED with a high current efficiency of 41.9 cd/A, power efficiency of 32.9 lm/W, and external quantum efficiency (EQE) of 16.8 % were achieved by employing the co-deposited copper complex as the emitter.

与使用预合成配合物相比，将卤化铜和有机材料共沉积以直接生成发光铜配合物的策略被认为是制造有机发光二极管 (OLED) 的一种直接且有前途的方法。在这项工作中，四个氮原子在氮杂芴部分不同位置的氮杂-9,9-螺二芴（氮杂-SBF）与碘化铜（I）（CuI）共沉积形成发光复合物。有趣的是，我们发现这些共沉积铜配合物的发射特性包含磷光和热激活延迟荧光 (TADF) 特性。通过改变氮原子的位置，可以有效地增强TADF过程，使PLQY达到92.2%。因此，具有 41.9 cd/A 高电流效率的绿色 OLED，