Lead-Free Hybrid Metal Halides with a Green-Emissive [MnBr4] Unit as a Selective Turn-On Fluorescent Sensor for Acetone

Mingze Li; Jun Zhou; Maxim S Molokeev; Xingxing Jiang; Zheshuai Lin; Jing Zhao; Zhiguo Xia

doi:10.1021/acs.inorgchem.9b02374

Lead-Free Hybrid Metal Halides with a Green-Emissive [MnBr₄] Unit as a Selective Turn-On Fluorescent Sensor for Acetone

Inorg Chem. 2019 Oct 7;58(19):13464-13470. doi: 10.1021/acs.inorgchem.9b02374. Epub 2019 Sep 10.

Authors

Mingze Li¹, Jun Zhou¹, Maxim S Molokeev^{2

3

4}, Xingxing Jiang⁵, Zheshuai Lin⁵, Jing Zhao¹, Zhiguo Xia^{1

6}

Affiliations

¹ The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering , University of Science and Technology Beijing , Beijing 100083 , China.
² Laboratory of Crystal Physics , Kirensky Institute of Physics, Federal Research Center KSC SB RAS , Krasnoyarsk 660036 , Russia.
³ Siberian Federal University , Krasnoyarsk 660041 , Russia.
⁴ Department of Physics , Far Eastern State Transport University , Khabarovsk , 680021 , Russia.
⁵ Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.
⁶ State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials , South China University of Technology , Guangzhou 510641 , China.

PMID: 31502835
DOI: 10.1021/acs.inorgchem.9b02374

Abstract

Organic-inorganic hybrid metal halides with zero-dimensional (0D) structure has emerged as a new class of light-emitting materials. Herein, a new lead-free compound (C₉NH₂₀)₂MnBr₄ has been discovered and a temperature-dependent phase transition has been identified for two phases (space group P2₁/c and C2/c) in which individual [MnBr₄]^2- anions connect with organic cations, (C₉NH₂₀⁺) (1-buty-1-methylpyrrolidinium⁺), forming periodic structure with 0D blocks. A green emission band, peaking at 528 nm with a high photoluminescence quantum efficiency (PLQE) of 81.08%, has been observed at room temperature, which is originated from the ⁴T₁(G) to ⁶A₁ transition of tetrahedrally coordinated Mn²⁺ ions, as also elaborated by density functional theory calculation. Accordingly, a fast, switchable, and highly selective fluorescent sensor platform for different organic solvents based on the luminescence of (C₉NH₂₀)₂MnBr₄ has been developed. We believe that the hybrid metal halides with high PLQE and the exploration of these as a fluorescence sensor will expand the applications scope of bulk 0D materials for future development.