Copper iodide hybrid clusters have attracted lots of interest in solution-processed light-emitting diodes (LEDs) for solid-state lighting and display in recent years, benefiting from their simple synthesis, structural diversity, high photoluminescence quantum yield (PLQY), and non-toxicity. However, most efficient copper iodide cluster LEDs are made by host-guest doped emitters and thus suffer from cumbersome synthesis and increased costs from the expensive hosts. Here, we report a non-doped cluster LED based on a novel copper iodine hybrid [35DPPy]CuI (35DPPy: 3,5-diphenylpyridine) with high PLQY and decent charge transport characteristic. The non-doped [35DPPy]CuI film synthesized by a one-step spin-coating approach possess the flat and compact morphology, high PLQY of 59.6%, and excellent heat/ultraviolet (UV) light/moisture/oxygen stability. The efficient green PL of [35DPPy]CuI is proved to originate from the synergistic contribution from thermally activated delayed fluorescence and phosphorescence. A non-doped green LED based on [35DPPy]CuI emitters is fabricated, achieving a peak external quantum efficiency of 4.8% and a maximum luminance of 3895 cd/m. More importantly, large-area LEDs with an emitting area of 4.00 cm are realized with homogeneous and bright electroluminescence, showing their attractive potentials as novel electroluminescent emitters in the application of non-doped cluster LEDs.

中文翻译：

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基于半导体碘化铜杂化物的高效非掺杂簇发光二极管

近年来，碘化铜杂化团簇由于其合成简单、结构多样性、高光致发光量子产率（PLQY）和非晶态发光等优点，在用于固态照明和显示的溶液加工发光二极管（LED）方面引起了人们的广泛兴趣。 -毒性。然而，最高效的碘化铜簇 LED 是由主客体掺杂发射器制成的，因此合成繁琐，并且昂贵的主体导致成本增加。在这里，我们报道了一种基于新型铜碘杂化物[35DPPy]CuI（35DPPy：3,5-二苯基吡啶）的非掺杂簇LED，具有高PLQY和良好的电荷传输特性。采用一步旋涂法合成的无掺杂[35DPPy]CuI薄膜具有平坦致密的形貌、高达59.6%的PLQY以及优异的热/紫外线(UV)光/湿/氧稳定性。 [35DPPy]CuI的高效绿色PL被证明源自热激活延迟荧光和磷光的协同贡献。制备了基于[35DPPy]CuI发射体的非掺杂绿光LED，其峰值外量子效率为4.8%，最大亮度为3895 cd/m。更重要的是，发光面积为4.00 cm的大面积LED实现了均匀且明亮的电致发光，显示出其作为新型电致发光发射器在非掺杂簇LED应用中的诱人潜力。