Low-dimensional lead-free metal halides with efficient self-trapped exciton (STE) emission have attracted tremendous attention in lighting applications. Despite great efforts in manipulating the STE emission properties, it is still a great challenge to achieve controllable STE emission tuning. Herein, we successfully synthesized novel one-dimensional (1D) β-Cs₃Cu₂Br₅ with tunable emission color modulation from blue-greenish to yellow by alloying with different Ag contents. In particular, the sample with a ratio of 12.4% exhibits broadband emission peaking at 508 nm with a high quantum yield of ca. 100%. Temperature-dependent single crystal X-ray diffraction, photoluminescence, and femtosecond transient absorption (TA) measurements further reveal that the Ag-induced lattice distortion of β-Cs₃Cu₂Br₅ contributed to its controllable STE emission properties. Moreover, stable Ag-alloyed crystals have shown potential application prospects in encryption, radiation thermometry and solid-state light emitting devices. This lattice distortion tuning strategy provides a new vision for the controllable STE emission of low-dimensional metal halides.

中文翻译：

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通过银合金化在一维 β-Cs3Cu2Br5 中实现高效可调谐自俘获激子发射，用于光电应用


具有高效自陷激子（STE）发射的低维无铅金属卤化物在照明应用中引起了极大的关注。尽管在操纵STE发射特性方面付出了巨大的努力，但实现可控的STE发射调谐仍然是一个巨大的挑战。在此，我们成功合成了新型一维（1D）β-Cs ₃ Cu ₂ Br ₅ ，其发射颜色可从蓝绿到黄色可调不同Ag含量的合金化。特别是，比例为 12.4% 的样品在 508 nm 处表现出宽带发射峰，量子产率高达约 100 nm。 100%。温度依赖性单晶 X 射线衍射、光致发光和飞秒瞬态吸收 (TA) 测量进一步揭示了 Ag 引起的 β-Cs ₃ Cu ₂ Br < b5> 有助于其可控的 STE 排放特性。此外，稳定的银合金晶体在加密、辐射测温和固态发光器件方面显示出潜在的应用前景。这种晶格畸变调谐策略为低维金属卤化物的可控STE发射提供了新的愿景。