Mn2+-Based Hybrid Metal Halides: A- and B-Site Co-Doped Cs3MnBr5 with High Luminescence and High Temperature Stability via High-Energy Ball Milling

Graphical A hybrid Mn 2+ -based metal halide (HMMH) was synthesized by high-energy ball milling (HEBM) for 25 minutes. A- and B-site co-doping of Cs 3 MnBr 5 are designed to form a more stable luminescent center and a hydrogen-bonding system. Poor luminescence intensity of Mn 2+ metal halides produced by HEBM and poor thermal stability of HMMHs were solved. Mn 2+ -based metal halides are important materials in the study of lead-free metal halides because of their high luminous efficiency, extensive availability of raw materials, and nontoxicity. At present, the synthesis of Cs₃MnBr₅ is impeded by the presence of intricate processes and environmental pollution, and the formation of crystals exhibits poor stability and low photoluminescence (PL) intensity. In this paper, an Mn 2+ -based hybrid metal halide was synthesized by co-doping Cs 3 MnBr 5 at the A and B sites. This synthesis was conducted under high-energy ball milling conditions for 25 min, resulting in a material with high photoluminescence intensity and temperature stability. In the new system, a hydrogen bond system and a [MnBr z (H 2 O) 4- z ] 2- z structure with high-binding energy are constructed. PL intensity of [Cs 0.85 (C 7 H 17 N 2 ) 0.15 ] 3 Mn 0.8 Mg 0.2 Br 5 · (6H 2 O) 0.2 is 302% of the initial value of Cs 3 MnBr 5 . The high-temperature thermal stability test of the samples was conducted using a platform constructed in our laboratory. The results demonstrated that the PL intensity after three rounds of thermal cycling is 374% of the initial value of Cs 3 MnBr 5 , which only decreases by 2.9% compared with the maximum. The solid-phase synthesis of Mn 2+ -based hybrid metal halides with excellent high-temperature luminescence stability has been realized, which shows a potential application prospect in the field of display.