Reversible Luminescent Switching Induced by Heat/Water Treatment in a Zero-Dimensional Hybrid Antimony(Ⅲ) Chloride

Abstract

Recently zero-dimensional (0-D) inorganic–organic metal halides (IOMHs) have become a promising class of optoelectronic materials. Herein, we report a new photoluminescent (PL) 0-D antimony(III)-based IOMH single crystal, namely [H2BPZ][SbCl5]·H2O (BPZ = benzylpiperazine). Photophysical characterizations indicate that [H2BPZ][SbCl5]·H2O exhibits singlet/triplet dual-band emission. Density functional theory (DFT) calculations suggest that [H2BPZ][SbCl5]·H2O has the large energy difference between singlet and triplet states, which might induce the dual emission in this compound. Temperature-dependent PL spectra analyses suggest the soft lattice and strong electron–phonon coupling in this compound. Thermogravimetric analysis shows that the water molecules in the lattice of the title crystal could be removed by thermal treatment, giving rise to a dehydrated phase of [H2BPZ][SbCl5]. Interestingly, such structural transformation is accompanied by a reversible PL emission transition between red light (630 nm, dehydrated phase) and yellow light (595 nm, water-containing phase). When being exposed to an environment with 77% relative humidity, the emission color of the dehydrated phase was able to change from red to yellow within 20 s, and the red emission could be restored after reheating. The red to yellow emission switching could be achieved in acetone with water concentration as low as 0.2 vol%. The reversible PL transition phenomenon makes [H2BPZ][SbCl5]·H2O a potential material for luminescent water-sensing.

Regulation and application of organic luminescence from low-dimensional organic–inorganic hybrid metal halides

“…Therefore, the development of highly efficient organic luminescent LDMH materials with tunable light color and stimuli-response performances remains a major challenge in this field. A feasible approach to achieve 144 tunable organic luminescence is to synthesize LDMHs using rearrangeable or isomerizable organic salts, which regulates the optical properties of organic cations by structural changes.…”

“…14(d)). 144 By removing H 2 O molecules from the lattice through heating treatment, [H 2 BPZ][SbCl 5 ]·H 2 O with yellow light emission at 595 nm can be transformed into a red light dehydrated phase [H 2 BPZ][SbCl 5 ] peaked at 630 nm. On the basis of the reversible transformation of photoluminescence of [H 2 BPZ][SbCl 5 ]·H 2 O, the authors achieved both a rapid response (20 s) to water molecules in 77% air humidity and sensitive detection of water content in acetone solution (0.2 vol% at least).…”

“…143 Copyright 2023, Wiley-VCH. (d) Inclusion/ dehydration change process of [H 2 BPZ][SbCl 5 ]ÁH 2 O 144.…”

Enhanced stability and tunable photoluminescence in Mn2+-doped one-dimensional hybrid lead halide perovskites for high-performance white light emitting diodes

“…Low-dimensional hybrid metal halide perovskites present an alternative to 3D perovskites, offering benefits such as tunable emission wavelength, enhanced PLQY, improved moisture resistance, and thermal stability. 13–22…”

“…Low-dimensional hybrid metal halide perovskites present an alternative to 3D perovskites, offering benets such as tunable emission wavelength, enhanced PLQY, improved moisture resistance, and thermal stability. [13][14][15][16][17][18][19][20][21][22] The numerous advantages of low-dimensional perovskites have driven researchers to optimize their luminescent properties through various modulation strategies. Among these, replacing lead with non-toxic metal ions has emerged as a promising approach for tuning photoluminescent properties.…”