Electrochemical Thin Film Deposition of Copper(I) Halides in Aqueous Solution: Substrate Extension and Structure Transformation

Abstract

In this paper, a green and simple electrochemical method is developed that can directly deposit thin films of [CuX(pyz)]n and [Cu2X2(pyz)]n (X = Cl, Br, I; pyz = pyrazine) in aqueous solution. This method can overcome the thermodynamical instability of Cu(I) and the poor solubility of hybrid organic–copper(I) halides. By heating in different atmospheres, the single‐crystal transformation between [CuX(pyz)]n and [Cu2X2(pyz)]n can be realized with luminescent switching, which is used for information encryption and encoding. More importantly, the corresponding thin film can be deposited on various substrates leading to flexible light‐emitting and photoelectric devices.

Chemical etching strategy to prepare microtubes of a hybrid organic cuprous halide

“…However, for hybrid organic cuprous chloride and bromide, the water and oxygen had to be rigorously controlled in previous synthesis methods, except in the newly-developed electrochemical synthesis. 36 A convenient synthesis for hybrid organic cuprous chloride and bromine could help to enrich the structures and functions of hybrid organic cuprous halides, including bandgap engineering. 37,38 As mentioned above, it is natural to propose the synthesis of hybrid organic cuprous halide tubes.…”

Supramolecular-Interactions-Modulated Photoluminescence in Indium Bromide-Based Isomers

“…Over the past few years, researchers have found that zero-dimensional ionic indium-based IOMHs are stable and low-toxicity materials with excellent luminescence properties. − Notably, while possessing organic cations, the anionic indium halide moieties in these ionic IOMHs are mostly pure inorganic such as octahedral (InX 6 ) 3– , conical (InX 5 ) 2– , tetrahedral (InX 4 ) − , , and dimeric (In 2 X 10 ) 4– (X = Cl, Br, I). , As is known, the coordination of organic ligands such as conjugated 2,2′-bipyridal and 1,10-phenanthroline (Phen) into inorganic halometalate units can lead to colorful PL arising from various mechanisms such as halogen-to-ligand charge transfer, ligand-to-metal charge transfer, and inorganic-to-organic charge transfer (IOCT). − Thus, it is anticipated that different combinations of organic ligands and cations can make the PL properties of indium-based IOMHs highly adjustable due to the variety of PL mechanisms and supramolecular interactions inside.…”

Thermally Induced Reversible Fluorescence Switching of Lead Chloride Hybrids for Anticounterfeiting and Encryption

“…Meanwhile, the organic molecules additionally separate the fluorescent centers to take away aggregation-induced quenching effects, as well as encase the metal halide polyhedral to enhance structural stability. 29 39 Despite several advances made in the field, higher transition temperatures are detrimental to enabling rapid detection in the environment, and the selectivity of thermochromic luminescent materials remains limited. Therefore, it is essential to design thermochromic materials in a way that is sensitive, reversible, and lower transition temperature.…”

“…This process significantly alters the chemical environment within the lattice and consequently changes its structural and optical properties, which differs significantly from dynamically emitting phosphors that combine up-conversion and down-conversion. 33 39 Despite several advances made in the field, higher transition temperatures are detrimental to enabling rapid detection in the environment, and the selectivity of thermochromic luminescent materials remains limited. Therefore, it is essential to design thermochromic materials in a way that is sensitive, reversible, and lower transition temperature.…”

“…reported cool-white-emitting Cu-based OIMH (Gua) 3 Cu 2 I 5 (Gua = guanidine) single crystals that switch quickly to yellow emission upon 360 K thermal stimulation . At 343 K, the Cu halide [CuBr­(pyz)] n (pyz = pyrazine) synthesized by Du et al underwent the single-crystal-to-single-crystal (SCSC) transition with substance [Cu 2 Br 2 (pyz)] n , resulting in a switch in fluorescence with yellow-red emission . Despite several advances made in the field, higher transition temperatures are detrimental to enabling rapid detection in the environment, and the selectivity of thermochromic luminescent materials remains limited.…”