Organic–inorganic hybrid perovskites have aroused intense research interest because of their excellent physical performance and potential for use in optoelectronic field. Herein, we report two new 2D hybrid lead bromides, (C₇H₁₈N₂)PbBr₄ [C₇H₁₈N₂ is 1,7-diaminoheptane] and (C₉H₂₂N₂)PbBr₄ [C₉H₂₂N₂ is 1,9-diaminononane], both of which possess ⟨100⟩-oriented inorganic layers consisting of corner-sharing octahedra. The optical bandgaps are experimentally determined to be 2.76 eV for (C₇H₁₈N₂)PbBr₄ and 2.78 eV for (C₉H₂₂N₂)PbBr₄. Upon 390 nm excitation, (C₇H₁₈N₂)PbBr₄ exhibits white-light emission centered at 600 nm, and (C₉H₂₂N₂)PbBr₄ exhibits red-light emission centered at 620 nm. These broad photoluminescent spectra originate from the synergistic emission of free excitons (FEs) and self-trapped excitons (STEs). This work provides a strategy for realizing single-component white-light emission and efficient red-light emission in two-dimensional perovskites, demonstrating the vast application prospects of 2D perovskites in photoelectric devices.

中文翻译：

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二维有机-无机杂化钙钛矿中的宽带光致发​​光：（C ₇ H ₁₈ N ₂）PbBr ₄和（C ₉ H ₂₂ N ₂）PbBr ₄

有机-无机杂化钙钛矿因其出色的物理性能和在光电领域的应用潜力而引起了广泛的研究兴趣。在此，我们报告了两种新的二维杂化铅溴化物：（C ₇ H ₁₈ N ₂）PbBr ₄ [C ₇ H ₁₈ N ₂为1,7-_二氨基庚烷]和（C ₉ H ₂₂ N ₂）PbBr ₄ [C ₉ H ₂₂ N ₂[是1,9-二氨基壬烷]，两者都具有corner100⟩取向的无机层，由角共享八面体组成。实验确定（C ₇ H ₁₈ N ₂）PbBr ₄的光学带隙为2.76 eV ，（C ₉ H ₂₂ N ₂）PbBr ₄的光学带隙为2.78 eV 。在390 nm激发下，（C ₇ H ₁₈ N ₂）PbBr ₄表现出以600 nm为中心的白光发射，而（C ₉ H ₂₂ N ₂）PbBr ₄表现出以620 nm为中心的红光发射。这些宽泛的光致发光光谱源于自由激子​​（FEs）和自陷激子（STEs）的协同发射。这项工作为在二维钙钛矿中实现单组分白光发射和高效红光发射提供了一种策略，证明了二维钙钛矿在光电器件中的广阔应用前景。