Sun Jianan, Li Naiyu, Gong Zhuke, Man Yi, Zhong Chunlei, Duan Chunbo, Chen Shuo, Zhang Jing, Han Chunmiao, Xu Hui
MOE Key Laboratory of Functional Inorganic Material Chemistry, School of Chemistry and Material Science, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China.
Nat Commun. 2024 Jun 12;15(1):4997. doi: 10.1038/s41467-024-49394-8.
Despite potential in high-resolution and low-cost displays and lighting, multi-doping structures and low concentrations (<1%) limit repeatability and stability of single-emissive-layer white light-emitting devices. Herein, we report a singly doped white-emitting system of blue thermally activated delayed fluorescence host matrix (CzAcSF) doped by yellow CuI cluster ([tBCzDppy]CuI). CzAcSF:x% [tBCzDppy]CuI films realize photo- and electro-luminescence colors from cool white to warm white at x = 20-40. The external quantum efficiency of 23.5% was achieved at x = 30, indicating the record-high efficiency among solution-processed analogs and the largest doping concentration among efficient white light-emitting devices. It shows that di(tert-butyl)carbazole moieties in [tBCzDppy]CuI provide high-lying excited energy levels at~2.6 eV to mediate energy transfer from CzAcSF (2.9 eV) to coordinated CuI (2.2 eV). Our results demonstrate the antenna effect of ligands on optimizing charge and energy transfer in organic-cluster systems and superiority of white cluster light-emitting diodes in practical applications.
尽管在高分辨率和低成本显示器及照明方面具有潜力，但多掺杂结构和低浓度（<1%）限制了单发射层白光发光器件的重复性和稳定性。在此，我们报道了一种由黄色CuI簇（[tBCzDppy]CuI）掺杂的蓝色热激活延迟荧光主体基质（CzAcSF）的单掺杂白色发光体系。CzAcSF:x% [tBCzDppy]CuI薄膜在x = 20 - 40时实现了从冷白色到暖白色的光致发光和电致发光颜色。在x = 30时实现了23.5%的外量子效率，这表明在溶液处理的类似物中效率创纪录高，且在高效白光发光器件中掺杂浓度最大。结果表明，[tBCzDppy]CuI中的二叔丁基咔唑部分在~2.6 eV处提供了较高的激发能级，以介导从CzAcSF（2.9 eV）到配位CuI（2.2 eV）的能量转移。我们的结果证明了配体在优化有机簇体系中的电荷和能量转移方面的天线效应，以及白色簇发光二极管在实际应用中的优越性。
