Recently, metal halides have attracted much attention due to their fascinating optical properties. However, achieving efficient white emission with ultralong afterglow remains a great challenge. Herein, we report Sb³⁺/Mn²⁺-codoped CsCdCl₃ and multiple emission bands can be observed, which are derived from the self-trapped exciton emission of the Sb–Cl moiety and the d–d transition of Mn²⁺. Thus, tunable emission from cyan to orange light can be obtained. Moreover, efficient white emission with a luminous efficiency of 74% is observed when the energy-transfer efficiency from Sb³⁺ to Mn²⁺ is 34.5%. In particular, Sb³⁺/Mn²⁺-codoped CsCdCl₃ shows bright orange afterglow emission, and the afterglow intensity is 1000 times that of CsCdCl₃ and 20 times that of CsCdCl₃:Mn²⁺. Upon combining this with thermoluminescence spectra, it is found that Mn²⁺/Sb³⁺ codoping can effectively regulate the depth and density distribution of trap defects, resulting in the ultralong afterglow duration exceeding 12 h at room temperature. Surprisingly, white light stimulation can provide additional photonic energy for Sb³⁺/Mn²⁺-codoped CsCdCl₃, which enables the rapid release of trapped carriers to the emission center and rejuvenates afterglow emission after 12 h pre-delay. Finally, we demonstrated the applications of the as-synthesized compounds in single-component white light illumination, multiple optical anti-counterfeiting and information encryption.

中文翻译：

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在 Sb3+/Mn2+ 共掺杂的 CsCdCl3 晶体中具有超长余辉的高效可调谐白光发射，适用于多功能应用


最近，金属卤化物因其迷人的光学特性而备受关注。然而，实现具有超长余辉的高效白光发射仍然是一个巨大的挑战。在此，我们报道了 Sb³⁺/Mn²⁺ 共掺杂的 CsCdCl₃ 和多个发射带，这些发射带来源于 Sb-Cl 部分的自俘获激子发射和 Mn²⁺ 的 d-d 跃迁。因此，可以获得从青色到橙色光的可调发射。此外，当从 Sb³⁺ 到 Mn²⁺ 的能量转移效率为 74.5% 时，观察到高效的白光发射，发光效率为 34.5%。特别是，Sb³⁺/Mn²⁺ 共掺杂的 CsCdCl₃ 表现出亮橙色的余辉发射，余辉强度是 CsCdCl₃ 的 1000 倍，是 CsCdCl₃：Mn²⁺ 的 20 倍。将其与热释光光谱相结合，发现 Mn²⁺/Sb³⁺ 共掺杂可以有效调节陷阱缺陷的深度和密度分布，导致室温下超长余辉持续时间超过 12 h。令人惊讶的是，白光刺激可以为 Sb³⁺/Mn²⁺ 共掺杂的 CsCdCl₃ 提供额外的光子能量，这使得被捕获的载流子能够快速释放到发射中心，并在预延迟 12 小时后恢复余辉发射。 最后，我们演示了合成化合物在单组分白光照明、多重光学防伪和信息加密中的应用。