Room temperature synthesis of low-dimensional rubidium copper halide colloidal nanocrystals with near unity photoluminescence quantum yield

Abstract

Demonstration of Rb2CuX3 (X = Br, Cl) colloidal nanocrystals under UV light with a representation of one-dimensional Rb2CuBr3 crystal structure.

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

“…Energy dispersive spectroscopy (EDS) elemental mapping (Figure c, Figure S9) demonstrates the homogeneous distribution of elements in the compounds, and FTIR spectroscopy (Figure S10) confirms the existence of DMSO in microcrystals. It is notable that the same synthesis performed in dimethylformamide (DMF) does not lead to red-emitting materials, while the XRD patterns of as-synthesized particles in DMF (Figure S11) correspond to A 2 CuBr 3 (A = K, Rb) crystal structures, which have been reported previously. − , …”

Elucidation of the structural and optical properties of metal cation (Na+, K+, and Bi3+) incorporated Cs2AgInCl6double perovskite nanocrystals

“…22 The further development of Pb-free alternatives has explored the incorporation of other metal cations such as Sb, Bi and Cu, but these have not been fully examined to ascertain their suitability in optoelectronic applications. 23–27…”

Two-dimensional copper based colloidal nanocrystals: synthesis and applications

“…The first colloidal Rb 2 CuX 3 (X = Cl, Br) NCs were synthesised utilising a room-temperature ligand assisted re-precipitation technique by Vashishtha et al The addition of toluene and oleic acid ligands to Rb and Cu halide salts dissolved in DMSO resulted in the formation of NCs. 33 Both structures exhibited a nanoplate-like morphology, with average sizes of 7.7 nm and 7.5 nm for Rb 2 CuBr 3 and Rb 2 CuCl 3 , respectively. Despite having advantages such as being less toxic and stable, these copper-based halides have poor light-emitting characteristics in comparison with halide perovskites.…”

“…The emerging ternary alkali metal (Cs, Rb) copper halides that display strong electron–phonon coupling and structural distortion upon photoexcitation result in deeply self-trapped emission. 33,34 Given their photoluminescence properties, they are applied in blue LED fabrication. Moreover, they are also predicted as phonon glass electron crystals with a thermoelectric figure of merit ∼ 2.6.…”