Blue-emitting long-persistent luminescence phosphor Pb2+-doped CsCdCl3

• Published in: Journal of luminescence 2025-01, Vol.277, p.120957, Article 120957
• Main Authors: Qu, Bingyan, Zhu, Changrui, Huang, Gaoliang, Jiang, Yang, Zhou, Rulong, Wang, Lei
• Format: Article
• Language: English
• ISSN: 0022-2313
• DOI: 10.1016/j.jlumin.2024.120957

In our traditional impressions, the emission spectra of Pb2+ ions usually fall predominantly within the UV region. In this work, we find when coordinated with haloid Cl− ions in CsCdCl3, the Pb2+ ions could demonstrate bright blue emission from 350 to 500 nm with maximum peaking at about 412 nm under the excitation of 250–320 nm light. This emission can be assigned to 3P1 → 1S0 transition of Pb2+ ions. More interestingly, this all-inorganic metal halide compound CsCdCl3:Pb2+ exhibits a long persistent luminescence (LPL) lasting 1050 s, endowed with application potential in the information storage and function of analysis and detection. The LPL mechanism of Pb2+ in CsCdCl3 has been studied by thermoluminescence (TL) measurements and the First-principle calculation, which dominate that the 6p levels of Pb2+ are just below the conduction band by about 0.6 eV. The excited electrons can travel across these 6p levels and the electron traps through the conduction band thermally, delaying the emission temporarily and producing the afterglow finally. Our finding in this work proves the potential of Pb2+ activated phosphors in visible region and provides a unique approach to construct Pb2+ doped LPL phosphors. •Blue emission peaking at 412 nm obtained from Pb2+ ion coordinated with Cl− in CsCdCl3.•The halide material CsCdCl3:Pb2+ can give a blue afterglow lasting 1050 s.•Pb2+ ion can exchange excitation energy with intrinsic defects in CsCdCl3 thermally, resulting in afterglow of Pb2+.