Photoluminescent and vapochromic properties of the Mn(II)-doped (C6H11NH3)2PbBr4 layered organic–inorganic hybrid perovskite. (1st January 2021)

• Record Type: Journal Article
• Authors: Cuquejo-Cid, Alberto; García-Fernández, Alberto; García-Ben, Javier; Señarís-Rodríguez, María A.; Castro-García, Socorro; Sánchez-Andújar, Manuel; Vázquez-García, Digna
• Is Part Of: Polyhedron. Volume 193(2021)
• Publication Date: 2021-01-01
• Subjects: Hybryd perovskites -- Mn(II)-doped -- Photoluminescent -- Vapochromic; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2020.114840
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Following a simple solution-based synthetic approach, we have been able to prepare the ferroelectric CHA2 PbBr4 compound, doped with different amounts of Mn 2+ cation at lead-site. The doped compounds exhibit a broad PL emission at room temperature with large time constant and a selective and reversible luminescence vapochromic property in response to different volatile compounds with basic properties. Highlights: Following a simple solution-based synthetic approach, we have been able to prepare the ferroelectric CHA2 PbBr4 compound, doped with different amounts of Mn 2+ cation at lead-site. The doped compounds exhibit a broad PL emission at room temperature with large time constant. The observed PL emission is induced from an energy transfer from the excitons to the d-orbitals of Mn 2+ cation. Also, we have observed that these compounds show a selective and reversible luminescence vapochromic property in response to different volatile compounds with basic properties. Abstract: By a wet-chemistry route we have been able to effectively dope the CHA2 PbBr4 compound, a ferroelectric compound with photovoltaic effect, with different amounts of Mn 2+ obtaining three pure compounds CHA2 Pb1-x Mnx Br4 with x = 0.05, 0.07 and 0.11. At room temperature the crystal structure of these new Mn-doped compounds present an orthorhombic symmetric with polar space group Cmc 21, as in the case of the undoped compoud (x = 0). Very interestingly, the doped compounds exhibit a broad PL emissions at room temperature, with a maximum around 605 nm and a long PL lifetime (~0.55 ms), whose intensity increases further upon cooling. The observed PL emission is induced from an energy transfer from host semiconductor to the d-orbitals of Mn 2+ cation. In addition, we have explored the capability of these materials to act as chemical sensors for volatile organic compounds and report the selective luminescence vapochromic response in this family of compounds. Therefore, the here presented Mn-doped CHA2 Pb1-x Mnx Br4 compounds belong to the scarce and desirable group of multifunctional materials, where not only ferroelectric and photovoltaic properties can coexist but also photoluminescence and vapochromic properties, rendering them extremely interesting for a large number of potential practical applications.