Organic–inorganic metal halide hybrids have emerged as a new class of materials with fascinating optical and electronic properties. The exceptional structure tunability has enabled the development of materials with various dimensionalities at the molecular level, from three-dimensional (3D) to 2D, 1D, and 0D. Here, we report a new 1D lead chloride hybrid, C₄N₂H₁₄PbCl₄, which exhibits unusual inverse excitation-dependent broadband emission from bluish-green to yellow. Density functional theory calculations were performed to better understand the mechanism of this excitation-dependent broadband emission. This 1D hybrid material is found to have two emission centers, corresponding to the self-trapped excitons (STEs) and vacancy-bound excitons. The excitation-dependent emission is due to different populations of these two types of excitons generated at different excitation wavelengths. This work shows the rich chemistry and physics of organic–inorganic metal halide hybrids and paves the way to achieving novel light emitters with excitation-dependent broadband emissions at room temperature.

中文翻译：

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具有一维依赖于宽带发射的一维有机氯化铅杂化物

有机-无机金属卤化物杂化物已成为具有引人入胜的光学和电子特性的新型材料。出色的结构可调性使分子水平上从三维（3D）到2D，1D和0D的各种尺寸的材料的开发成为可能。在这里，我们报告了一种新型一维氯化铅杂化物C ₄ N ₂ H ₁₄ PbCl ₄，其显示出异常的逆激发相关的宽带发射，从蓝绿色到黄色。进行密度泛函理论计算，以更好地了解这种依赖于激发的宽带发射的机理。发现这种一维杂化材料具有两个发射中心，分别对应于自陷激子（STE）和空位结合的激子。依赖于激发的发射是由于在不同激发波长下产生的这两种类型的激子的种群不同。这项工作展示了有机-无机金属卤化物杂化体的丰富化学和物理性质，并为在室温下实现具有依赖于激发的宽带发射的新型发光体铺平了道路。