Regulating synthesis and photochromic behavior via interfacial Eu3+/Eu2+-Pb0/Pb2+ redox of the CsPbCl1.5Br1.5@ Ca0.9Eu0.1MoO4 porous composites. (March 2022)

• Record Type: Journal Article
• Authors: Yang, R.R.; Li, M.; Zhao, Y.F.; Wang, P.; Ye, S.
• Is Part Of: Materials today chemistry. Volume 23(2022)
• Publication Date: 2022-03
• Subjects: Redox reaction -- Eu3+ ions -- Mixed-halide perovskites -- Photo-induced phase segregation; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2021.100721
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: Halogen vacancies are regarded to play a vital role in photo-induced phase segregation and the resulting switchable emission colors in the soft mixed-halide perovskites; however, its control strategy via the balanced Pb 0 defects remains a big challenge. The research reports the regulation of synthesis and photochromic behavior via interfacial Eu 3+ /Eu 2+ -Pb 0 /Pb 2+ redox in composites of porous Ca0.9 Eu0.1 MoO4 and nominal mixed-halide perovskite CsPbCl1.5 Br1.5 . The composite takes full advantage of Eu 3+ ions with the concerns of its luminescence and variable valences. It provides an additional emission color besides the halide perovskite, manipulates the Pb 0 defects and the resulting Br-rich domain via interfacial redox reaction in the composites. The more contents of surfaced Eu 3+ caused by substituting the unequivalent Ca 2+ ions and the high volume-to-surface ratio of the porous Ca0.9 Eu0.1 MoO4 guarantees the interfacial access for the Eu 3+ and the halides. The research provides some perspectives on the regulation of ionic valence and photoluminescence of halide perovskites with the use of lanthanide ions. The composites may find potential applications in the anti-counterfeiting field. Highlights: Interfacial Eu 3+ /Eu 2+ -Pb 0 /Pb 2+ redox in composites is reported. It is partially responsible for photochromic behavior. It takes full advantage of lanthanide ion and perovskite halides. Anticounterfeiting labels with the composites are demonstrated. Graphical abstract: Image 1