High-Temperature Phase Transition Containing Switchable Dielectric Behavior, Long Fluorescence Lifetime, and Distinct Photoluminescence Changes in a 2D Hybrid CuBr₄ Perovskite

Abstract

A novel organic–inorganic hybrid perovskite crystal, [ClC6H4(CH2)2NH3]2CuBr4 (1), having experienced an invertible high-temperature phase transition near T c (the Curie temperature T c = 355 K), has been successfully synthesized. The phase-transition characteristics for compound 1 are thoroughly revealed by specific heat capacity (C p), differential thermal analysis, and differential scanning calorimetry tests, possessing 16 K broad thermal hysteresis. Multiple-temperature powder X-ray diffraction analysis further proves the phase-transition behavior of compound 1. Moreover, compound 1 exhibits a significant steplike dielectric response near T c, revealing that it can be deemed to be a promising dielectric switching material. The variable-temperature fluorescence experiments show distinct photoluminescence (PL) changes of compound 1. Further investigation and calculation disclose that the fluorescence lifetime of compound 1 can reach as long as 55.46 μs, indicating that it can be a potential PL material. All of these researches contribute a substitutable avenue in the design and construction of neoteric phase-transition compounds combining high Curie temperature and PL properties.

A 1D chiral infinite chain organic metal halide hybrid with excellent SHG switching and moderate spontaneous polarization

“…10,11 Lin, Zhou et al reported low-dimensional OMHH exhibiting remarkable properties compared to 2D and 3D OMHHs, due to the strong quantum confinement and site isolation in 1D. 12 C 4 N 2 H 14 PbBr 4 display efficient bluish white-light emissions with photoluminescence quantum efficiencies of approximately 20%, due to its unique one-dimensional structure which enables strong quantum confinement with the formation of self-trapped excited states. 13 Ian C. Smith et al reported in his work that low-dimensional inorganic–organic hybrid materials tend to show better moisture resistance than multi-dimensional hybrid materials, which may benefit from the connection model of the inorganic component with the organic one.…”

High-Tp-triggered phase transition exhibiting switchable dielectric–thermal responses and long photoluminescence lifetime in a novel inclusion luminophor

“…Further calculation and analysis displayed that the PL lifetime of 1 is 43.998 μs, and is larger than that of numerous superior PL materials, e.g. , (γ-methoxy propyl amine) 2 PbBr 4 (2.52 ns), 43 CH 3 NH 3 PbI 3 (299.3 ns), 44 Cu 4 I 4 (dcpm) 2 (6.22 μs), 45 and slightly shorter than [ClC 6 H 4 (CH 2 ) 2 NH 3 ] 2 CuBr 4 (55.46 μs), 15 indicating that 1 possesses potential application in fluorescence devices.…”

“…1–7 Molecular phase-transition materials are principally divided into host–guest inclusion compounds, 8–10 anion–cation organic salts, 11,12 and perovskite/perovskite-like compounds. 13–15 Among them, the host–guest inclusions represented by organic ammonium–crown ether families are a class of greatly prospective ferroelectric–dielectric materials with potential applications in various fields, e.g. , switchable dielectric devices, sensors, digital processing, luminescence, molecular catalysis, molecular recognition and photoelectric technology, and have aroused growing research interest in recent years.…”

Dielectric Response Behavior and Displacement‐Type Metal‐Free Organic‐Inorganic Hybrid Phase Transition Material: trans‐(NH3C6H10NH3)[NO3]2

“…[6][7][8][9][10] Among them, the behavior of dielectric response is one of the most intriguing features, because it could switch between a high-dielectric state and a low-dielectric state around the phase transition temperature. [11][12][13][14] At present, as a new branch of phase transition materials, organic-inorganic phase transition materials have received widespread research enthusiasm because of their simple synthesis and flexible structure. [15][16][17][18] Therefore, it provides a research direction for exploring new dielectric materials.…”

“…It is noteworthy that many physical properties (such as dielectric, piezoelectricity and ferroelectricity) transition occur near the phase transition temperature [6–10] . Among them, the behavior of dielectric response is one of the most intriguing features, because it could switch between a high‐dielectric state and a low‐dielectric state around the phase transition temperature [11–14] . At present, as a new branch of phase transition materials, organic‐inorganic phase transition materials have received widespread research enthusiasm because of their simple synthesis and flexible structure [15–18] .…”