Facile synthesis of efficient blue-light-emitting copper(I) halide hybrid phosphors for applications in pc-WLEDs and X-ray imaging

Organic-inorganic hybrid copper(I) halide semiconductors have attracted extensive attention for applications in phosphor-converted white light-emitting diodes (pc-WLEDs), X-ray imaging, and photodetectors because of their superior photo/radioluminescence, structural diversity, and eco-friendliness. In our previous work, we proposed a novel strategy for synthesizing highly efficient blue-emitting copper(I) halide hybrids by combining coordinated anionic inorganic modules with cationic derivatives. However, the complexity of the synthesis process has limited the practical application of this approach. To address this challenge, we report a facile, efficient, and rapid solution-based ultrasonic treatment method for synthesizing high-performance blue-emitting phosphors with this structural motif using inexpensive and commercially available tetraethylammonium halides (TEAX, X = Cl, Br, and I). The synergistic interplay of ionic and covalent bonds in these compounds endows them with a high photoluminescence quantum yield (PLQY) of 70% and excellent stability. These materials exhibit a thermally activated delayed fluorescence (TADF) mechanism, delivering outstanding performance in pc-WLEDs and X-ray imaging. Their exceptional properties highlight their significant potential for use in optoelectronic devices and X-ray scintillators. This work provides an important reference for the rapid synthesis of high-performance copper(I) halide hybrid phosphors and paves the way for their commercial application.

有机-无机杂化卤化铜(I)半导体凭借其优异的光致/放射发光性能、结构多样性与环境友好性，在荧光粉转换型白光发光二极管（phosphor-converted white light-emitting diodes，pc-WLEDs）、X射线成像及光电探测器领域受到广泛关注。在前期研究工作中，我们提出了一种通过配位阴离子无机模块与阳离子衍生物结合，合成高效蓝色发光卤化铜(I)杂化物的新颖策略。然而，该合成过程的复杂性限制了此方法的实际应用。为解决这一挑战，我们报道了一种简便、高效且快速的基于溶液的超声处理方法，可利用廉价易得的卤化四乙铵（tetraethylammonium halides，TEAX，X=Cl、Br、I）来制备具有该结构基元的高性能蓝色发光荧光粉。这类化合物中离子键与共价键的协同作用，赋予其高达70%的光致发光量子产率（photoluminescence quantum yield，PLQY）以及优异的稳定性。这些材料展现出热激活延迟荧光（thermally activated delayed fluorescence，TADF）机制，在pc-WLEDs与X射线成像中表现出卓越性能。其优异特性凸显了其在光电器件与X射线闪烁体领域的巨大应用潜力。本工作为高性能卤化铜(I)杂化荧光粉的快速合成提供了重要参考，并为其商业化应用铺平了道路。