NIR-excitable heterostructured upconversion perovskite nanodots with improved stability

Longfei Ruan; Yong Zhang

doi:10.1038/s41467-020-20551-z

NIR-excitable heterostructured upconversion perovskite nanodots with improved stability

Longfei Ruan
, Yong Zhang^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

103 Citations (Scopus)

33 Downloads (CityUHK Scholars)

Abstract

There is a great need to develop heterostructured nanocrystals which combine two or more different materials into single nanoparticles with combined advantages. Lead halide perovskite quantum dots (QDs) have attracted much attention due to their excellent optical properties but their biological applications have not been much explored due to their poor stability and short penetration depth of the UV excitation light in tissues. Combining perovskite QDs with upconversion nanoparticles (UCNP) to form hybrid nanocrystals that are stable, NIR excitable and emission tunable is important, however, this is challenging because hexagonal phase UCNP can not be epitaxially grown on cubic phase perovskite QDs directly or vice versa. In this work, one-pot synthesis of perovskite-UCNP hybrid nanocrystals consisting of cubic phase perovskite QDs and hexagonal phase UCNP is reported, to form a watermelon-like heterostructure using cubic phase UCNP as an intermediate transition phase. The nanocrystals are NIR-excitable with much improved stability. © The Author(s) 2021.

Original language	English
Article number	219
Journal	Nature Communications
Volume	12
Online published	11 Jan 2021
DOIs	https://doi.org/10.1038/s41467-020-20551-z
Publication status	Published - 2021
Externally published	Yes

Funding

We acknowledge financial support from the Ministry of Education of Singapore (MOE) under its Tier3 and Tier1 programme (MOE 2016-T3-1-004, R-397-000-274-112, R-397-000-270-114), National Medical Research Council (NMRC/OFIRG/17nov066, R-397-000-317-213), and the National University of Singapore.

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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AB - There is a great need to develop heterostructured nanocrystals which combine two or more different materials into single nanoparticles with combined advantages. Lead halide perovskite quantum dots (QDs) have attracted much attention due to their excellent optical properties but their biological applications have not been much explored due to their poor stability and short penetration depth of the UV excitation light in tissues. Combining perovskite QDs with upconversion nanoparticles (UCNP) to form hybrid nanocrystals that are stable, NIR excitable and emission tunable is important, however, this is challenging because hexagonal phase UCNP can not be epitaxially grown on cubic phase perovskite QDs directly or vice versa. In this work, one-pot synthesis of perovskite-UCNP hybrid nanocrystals consisting of cubic phase perovskite QDs and hexagonal phase UCNP is reported, to form a watermelon-like heterostructure using cubic phase UCNP as an intermediate transition phase. The nanocrystals are NIR-excitable with much improved stability. © The Author(s) 2021.

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NIR-excitable heterostructured upconversion perovskite nanodots with improved stability

Abstract

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