Low-Temperature Molten Salts Synthesis: CsPbBr3 Nanocrystals with High Photoluminescence Emission Buried in Mesoporous SiO2
AuthorsAn, Mai Ngoc
De Trizio, Luca
KAUST DepartmentMaterial Science and Engineering Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Embargo End Date2022-02-11
Permanent link to this recordhttp://hdl.handle.net/10754/667370
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AbstractUsing mesoporous SiO2 to encapsulate CsPbBr3 nanocrystals is one of the best strategies to exploit such materials in devices. However, the CsPbBr3/SiO2 composites produced so far do not exhibit strong photoluminescence emission and, simultaneously, high stability against heat and water. We demonstrate a molten-salts-based approach delivering CsPbBr3/mesoporous-SiO2 composites with high PLQY (89 ± 10%) and high stability against heat, water, and aqua regia. The molten salts enable the formation of perovskite nanocrystals and other inorganic salts (KNO3–NaNO3–KBr) inside silica and the sealing of SiO2 pores at temperatures as low as 350 °C, representing an important technological advancement (analogous sealing was observed only above 700 °C in previous reports). Our CsPbBr3/mesoporous-SiO2 composites are attractive for different applications: as a proof-of-concept, we prepared a white-light emitting diode exhibiting a correlated color temperature of 7692K. Our composites are also stable after immersion in saline water at high temperatures (a typical underground environment of oil wells), therefore holding promise as oil tracers.
CitationAn, M. N., Park, S., Brescia, R., Lutfullin, M., Sinatra, L., Bakr, O. M., … Manna, L. (2021). Low-Temperature Molten Salts Synthesis: CsPbBr3 Nanocrystals with High Photoluminescence Emission Buried in Mesoporous SiO2. ACS Energy Letters, 900–907. doi:10.1021/acsenergylett.1c00052
SponsorsWe acknowledge funding from the programme for research and Innovation Horizon 2020 (2014-2020) under the Marie Skłodowska-Curie Grant Agreement COMPASS No. 691185 and from the Basic Research in Science & Engineering through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2020R1C1C1009150 and 2019M3D1A1078299).
PublisherAmerican Chemical Society (ACS)
JournalACS Energy Letters
Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by/4.0/