Room temperature synthesis of low-dimensional rubidium copper halide colloidal nanocrystals with near unity photoluminescence quantum yield
| Autor: | David Giovanni, Yanan Fang, Deviana Kathleen, Subodh Mhaisalkar, Maciej Klein, Timothy J. White, Parth Vashishtha, Tze Chien Sum, Nripan Mathews, Thomas J. N. Hooper |
|---|---|
| Přispěvatelé: | School of Materials Science and Engineering, School of Physical and Mathematical Sciences, Energy Research Institute @ NTU (ERI@N) |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Nanoscale. 13:59-65 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/d0nr08093d |
| Popis: | 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. National Research Foundation (NRF) P.V. acknowledges a Presidential Postdoctoral Fellowship from Nanyang Technological University (NTU), Singapore via grant 04INS000581C150OOE01. M.K., N.M., S.G.M., and T.W. acknowledge financial support from the Singapore National Research Foundation, Prime Minister's Office, through the Competitive Research Program (CRP Award No. NRF-CRP14-2014-03). T.C.S and D.G. acknowledge the financial support from the NRF Investigatorship (NRF-NRFI-2018-04) and the Ministry of Education under its AcRF Tier 1 grant (RG91/19) and Tier 2 grant MOE2019-T2-1-006. The authors would like to acknowledge the Facility for Analysis, Characterization, Testing and Simulation (FACTS) at NTU, Singapore, for use of their electron microscopy and X-ray diffraction facilities. We would also like to acknowledge the NTU Centre of High Field NMR Spectroscopy and Imaging for the use of their NMR facilities. We thank Mr. Sai S. H. Dintakurti and Dr. Ankit, NTU, Singapore. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|