Progress in copper metal halides for optoelectronic applications

Abstract

Ternary metal halides, including perovskites, have become a popular field of study over the last decade. Recently many groups have attempted to replace the lead in lead-based perovskites with other...

Tuning the Self-Trapped Emission: Reversible Transformation to 0D Copper Clusters Permits Bright Red Emission in Potassium and Rubidium Copper Bromides

“…Lead halide perovskites have been thoroughly explored for solar cells, LEDs, and other emissive applications, but the toxicity of lead may hinder their use in some areas. − Recently, solution processable and stable ternary copper halides, with an A n B m X n + m formula, where A is a singly charged cation, B is Cu­[I], and X is Cl, Br, or I, have displayed emission with high quantum yields and long carrier lifetimes. − Environmentally friendly copper is a promising material for optoelectronics due to its abundance, low price, and structural, compositional, and stoichiometric flexibility. , Thus, these copper-based halides may be able to replace lead-based perovskites in some display and lighting applications.…”

“…4−9 Environmentally friendly copper is a promising material for optoelectronics due to its abundance, low price, and structural, compositional, and stoichiometric flexibility. 10,11 Thus, these copper-based halides may be able to replace lead-based perovskites in some display and lighting applications.…”

Potassium and Rubidium Copper Halide A2CuX3 (A = K, Rb, X = Cl, Br) Micro- and Nanocrystals with Near Unity Quantum Yields for White Light Applications

“…Next, we studied the optical properties of these ternary copper halides. Figure a displays the bright deep blue emission of A 2 CuX 3 (A = K, Rb; X = Cl, Br) solution under 254 nm UV irradiation, with PL peaks located in the range of 380–400 nm and a relatively narrow full width at half-maximum (fwhm) <60 nm (Figure b, Table ) compared with other ternary copper halides . These nano/microcrystal solutions have strong absorption peaks at 273, 260, 288, and 262 nm for K 2 CuCl 3 , K 2 CuBr 3 , Rb 2 CuCl 3 , and Rb 2 CuBr 3 , respectively.…”

“…Among various metals, environmentally friendly copper shows promising potential because of the abundance, low price, and intrinsic functional features of copper-based compounds. Recently, cesium copper halides have attracted a good deal of attention for their outstanding optical properties, semi-tunable band gaps, and high photoluminescence quantum yield (PLQY). − These materials have been successfully applied in optoelectronic devices such as charge injection and down-conversion LEDs. ,,,,− In addition to cesium copper halides, single crystals of other alkali (K, Rb) copper halides with excellent optical properties have also been reported. − Due to their deep blue emission, high PLQYs, and good air stability, they have also been reported as crystalline X-ray and γ-ray scintillators as have other perovskite materials . Although these single crystals are highly emissive, one of the disadvantages of rubidium is that 87 Rb has an abundance of 27.8% and a specific activity of 670 Bq/g, whereas potassium lacks any significant radioactive isotopes .…”

Template Assembled Large‐Size CsPbBr3 Nanocomposite Films toward Flexible, Stable, and High‐Performance X‐Ray Scintillators

“…[6] Thus, it is of great importance to explore efficient luminescent materials with a high energy-converting efficiency and an excellent stability for scintillators. Among the reported emitters, inorganic perovskites DOI: 10.1002/lpor.202100736 gain great researching interests in the fields such as solid-state lighting [7][8][9] and radiation detection, [10][11][12] due to the facile preparation method, [13][14][15] high absorption coefficient, [16][17][18][19] high defect tolerance, [20][21][22][23][24] and tunable emission. [25][26][27][28] However, their commercialization still suffers from a formidable issue of instability of perovskites, in which the phase separation and degradation occur when exposed to water and oxygen for long time.…”