Five-level anti-counterfeiting based on versatile luminescence of tri-doped double perovskites

作者：Xingru Yang, Yuhang Sheng, Linglong Zhang, Lun Yang, Fangjian Xing, Yunsong Di, Cihui Liu, Fengrui Hu, Xifeng Yang, Guofeng Yang, Yushen Liu, Zhixing Gan · 发表于：Nano Research · 年份：2024 · DOI：10.1007/s12274-024-6918-5 · 被引用次数：27 · 研究领域：Perovskite Materials and Applications、Quantum Dots Synthesis And Properties、Luminescence and Fluorescent Materials

Luminescent materials with multi-emission features are difficult to be replicated, which are highly desirable for advanced anti-counterfeiting. Here, we report the pioneering synthesis of Mn 2+ /Yb 3+ /Er 3+ tri-doped Cs 2 Ag 0.8 Na 0.2 InCl 6 double perovskites (MYE-DP), which exhibit photoluminescence (PL) covering from visible to near-infrared (NIR). The PL colors under excitations of 254 and 365 nm are notably different due to the changed relative emission intensities of self-trapped excitons (STEs) and Mn 2+ d–d transition. Moreover, under the excitation of a NIR laser, the MYE-DP exhibits upconversion (UC) emissions of Mn 2+ and Er 3+ . After ceasing the excitation, the long-lived trapped electrons can be thermally released to Mn 2+ and Er 3+ ions, resulting in both visible and NIR afterglow. Based on multi-modal emissions of the MYE-DP, we demonstrate a five-level anti-counterfeiting strategy, which significantly increases the anti-counterfeiting security. In addition, this work provides valuable insights into the energy transfer between STEs, Mn 2+ , Ln 3+ , and traps, laying a solid foundation for future development of new lead-free perovskites.