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Updated: Jul 7, 2025

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Published on: November 10, 2017

Heteroepitaxial Growth to Construct Hexagonal/Hexagonal β-NaYF₄:Yb,Tm/Cs₄PbBr₆ Multi-Code Emitting Core/Shell

Rui Gao¹, Wanqing Xu¹, Zhiqing Wang²

¹Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)

|December 25, 2023

Summary

We developed a novel upconversion nanoparticle-metal halide perovskite heterostructure using hexagonal β-NaYF4 and Cs4PbBr6. This core/shell structure exhibits enhanced green emission via Förster resonance energy transfer, improving luminescence and stability for optoelectronic applications.

Keywords:

energy transfer heteroepitaxial growth stability β‐NaYF4:Yb,Tm/Cs4PbBr6 core/shell nanocrystals

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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

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Published on: December 4, 2014

Area of Science:

Materials Science
Nanotechnology
Photophysics

Background:

Upconversion nanoparticles (UCNPs) and metal halide perovskites (MHPs) possess unique photophysical properties.
Synthesizing UCNP-MHP heterostructures is challenging due to structural dissimilarities.
Existing methods struggle to achieve high-quality integration and optimal performance.

Purpose of the Study:

To construct a novel UCNP/MHP heterostructure with enhanced luminescence and stability.
To investigate the role of structural similarity in heteroepitaxial growth.
To explore Förster resonance energy transfer (FRET) mechanisms in the heterostructure.

Main Methods:

Hexagonal β-NaYF4 and hexagonal Cs4PbBr6 were selected for heterostructure synthesis.
Core/shell nanocrystals (NCs) of β-NaYF4:Yb,Tm/Cs4PbBr6 were fabricated via heteroepitaxial growth.
Photoluminescence spectroscopy was used to analyze emission properties and FRET efficiency.
Water-resistance and thermal cycling stability were evaluated.

Main Results:

High-quality β-NaYF4:Yb,Tm/Cs4PbBr6 core/shell NCs were successfully synthesized.
A narrow-band green emission centered at 524 nm was observed under 980 nm excitation.
Significantly enhanced FRET efficiency (58.33%) was achieved compared to physically mixed samples (1.84%).
The core/shell structure improved the water-resistance and thermal cycling stability of Cs4PbBr6.

Conclusions:

The study demonstrates a new approach for constructing UCNP/MHP heterostructures with improved luminescence.
The heteroepitaxial growth strategy leverages structural similarity for high-quality integration.
The enhanced FRET and stability open avenues for advanced optoelectronic applications.