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Title: Room temperature synthesis of low-dimensional rubidium copper halide colloidal nanocrystals with near unity photoluminescence quantum yield
Authors: Vashishtha, Parth
Hooper, Thomas James Nelson
Fang, Yanan
Deviana, Kathleen
Giovanni, David
Klein, Maciej
Sum, Tze Chien
Mhaisalkar, Subodh Gautam
Mathews, Nripan
White, Tim
Keywords: Engineering::Materials
Issue Date: 2020
Source: Vashishtha, P., Hooper, T. J. N., Fang, Y., Deviana, K., Giovanni, D., Klein, M., ... White, T. (2020). Room temperature synthesis of low-dimensional rubidium copper halide colloidal nanocrystals with near unity photoluminescence quantum yield. Nanoscale. doi:10.1039/D0NR08093D
Journal: Nanoscale 
Abstract: Metal lead halide perovskite nanocrystals have emerged as promising candidates for optoelectronic applications. However, the inclusion of toxic lead is a major concern for the commercial viability of these materials. Herein, we introduce a new family of non-toxic reduced dimension Rb2CuX3 (X= Br, Cl) colloidal nanocrystals with one-dimensional crystal structure consisting [CuX4]3- ribbons isolated by Rb+ cations. These nanocrystals were synthesised using a room-temperature method under ambient conditions, which makes them cost effective and scalable. Phase purity quantification was confirmed by Rietveld refinement of powder x-ray diffraction and corroborated by 87Rb MAS NMR technique. Both samples also exhibited high thermal stability up to 500°C, which is essential for optoelectronic applications. Rb2CuBr3 and Rb2CuCl3 displays PL emission peaks at 387 nm and 400 nm with high PLQYs of ~100% and ~49%, respectively. Lastly, the first colloidal synthesis of quantum-confined rubidium copper halide-based nanocrystals opens up a new avenue to exploit their optical properties in lighting technology as well as water sterilisation and air purification.
ISSN: 2040-3372
DOI: 10.1039/D0NR08093D
DOI (Related Dataset): 10.21979/N9/RFZWVA
Schools: School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2020 Royal Society of Chemistry. All rights reserved. This paper was published in Nanoscale and is made available with permission of Royal Society of Chemistry.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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