Please use this identifier to cite or link to this item: https://doi.org/10.1021/acsami.1c14711
Title: Upconversion Perovskite Nanocrystal Heterostructures with Enhanced Luminescence and Stability by Lattice Matching
Authors: Ruan, Longfei 
Zhang, Yong 
Keywords: perovskite
upconversion
energy transfer
lattice mismatch
stability
Issue Date: 19-Oct-2021
Publisher: AMER CHEMICAL SOC
Citation: Ruan, Longfei, Zhang, Yong (2021-10-19). Upconversion Perovskite Nanocrystal Heterostructures with Enhanced Luminescence and Stability by Lattice Matching. ACS APPLIED MATERIALS & INTERFACES 13 (43) : 51362-51372. ScholarBank@NUS Repository. https://doi.org/10.1021/acsami.1c14711
Abstract: Lead halide perovskite quantum dots (PQDs) exhibit excellent photoelectric and optical properties, but their poor stability and low multiphoton absorption efficiency greatly limit their biological applications. Efforts have been made to combine upconversion nanoparticles (UCNPs) with PQDs to produce a composite material that is NIR-excitable, upconverting, and emission-tunable due to the unique optical properties of UCNPs, which converts tissue-penetrating near-infrared light into visible light based on an upconversion multiphoton excitation process. However, it is challenging to make such a nanocrystal heterostructure and maintain good optical properties and stability of both UCNPs and PQDs because they have different crystal structures. Here, we report the synthesis of heterostructured UCNP-PQD nanocrystals to bring hexagonal-phase NaYF4 UCNPs and cubic-phase CsPbBr1X2 PQDs in close proximity in a single nanocrystal, leading to efficient Förster resonance energy transfer (FRET) from the UCNP to the PQD under NIR excitation, as compared to their counterparts in solution. Moreover, by further improving the lattice matching between the UCNP and PQD using Gd to replace Y, heterostructured CsPbBr3-NaGdF4:Yb,Tm nanocrystals are successfully synthesized, with much enhanced luminescence and stability at high temperatures or in polar solvents or under continuous ultraviolet light excitation as compared to those of the CsPbBr3-NaYF4:Yb,Tm nanocrystals and pure PQDs.
Source Title: ACS APPLIED MATERIALS & INTERFACES
URI: https://scholarbank.nus.edu.sg/handle/10635/227585
ISSN: 1944-8244
1944-8252
DOI: 10.1021/acsami.1c14711
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