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808 nm Excited Energy Migration Upconversion Nanoparticles Driven by Nd3+-Trinity System with Color-Tunability and Superior Luminescent Properties

Abstract

We have developed the energy migration upconversion (EMU) nanoparticles (UCNPs) with optimal Nd3+-sensitization under excitation of 808 nm laser to avoid the over-heating effect caused by 980 nm laser while maximizing the excitation efficiency. To realize efficient 808 nm sensitization, a “Nd3+-Trinity System ” was implemented into the energy migration upconversion (EMU) cores (NaGdF4:Yb,Tm@NaGdF4:Yb,X, X=Eu/Tb), resulting in a core-multishells structure of EMU cores (accumulation layer@activation layer)@transition layer@harvest layer@activation layer. The sapatially separated dopants and optimized Yb3+/Nd3+ content effectively prevented severe quenching events in the UCNPs and their Nd3+-sensitized EMU-based photoluminescence mechanism was studied under 808 nm excitation. These Nd3+-Trinity EMU systems UCNPs presented enhanced upconversion luminescence and prolonged lifetime compared to the 980 nm excited UCNP of EMU system. It is proposed that 975 nm and 1056 nm NIR photons induced from the Nd3+→Yb3+ energy transfer facilitate the Tm3+ accumulation process due to the matched energy gaps, which contributes to the extended lifetimes. More importantly, the synthesized UCNPs had a small average size of sub-15 nm and they not only exhibited color-tunability via Eu3+/Tb3+ activators, but also released larger portion of Tm3+ red emission at 647 nm and had better penetration ability in water at 808 nm excitation, which are favorable for bioimaging applications.

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Publication details

The article was received on 20 Sep 2017, accepted on 28 Dec 2017 and first published on 29 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR07026H
Citation: Nanoscale, 2017, Accepted Manuscript
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    808 nm Excited Energy Migration Upconversion Nanoparticles Driven by Nd3+-Trinity System with Color-Tunability and Superior Luminescent Properties

    S. Guo, T. Ming-Kiu, W. Lo, J. hao and W. Wong, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR07026H

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