Issue 11, 2019

Dual-mode color tuning based on upconversion core/triple-shell nanostructure

Abstract

Manipulating the upconversion (UC) emission color by externally applied fields allows access to a range of novel applications. Although such controls based on the multi-color UC nanocrystals (NCs) have previously been reported, it is still a challenge to construct a multi-mode responsive system that can enable multifunctionality within one single nanostructure. Herein, an integrated core/triple-shell nanostructure, in which the different activators are spatially separated, is applied for a dual-mode manipulation of the UC emission color. The 3-photon dominant UC emission intensity of the Tm3+ ions is enhanced more than that of the 2-photon counterpart of the Er3+ ions by increasing the excitation power, leading to an excitation power induced color variation. Moreover, the UC emission intensity of the Er3+ activators in the core exhibit a thermal quenching effect, while that of the Tm3+ ions in the second-shell show near-zero thermal quenching in the visible region, which contributes to the temperature dependent color change. Upon tuning the emission color by means of appropriate co-doping in the core, a series of power/thermal dual-mode responsive multi-color UC NCs are achieved, which endows the UC nanostructure with a bi-functionality that can find potential applications in temperature sensing and anti-counterfeiting fields.

Graphical abstract: Dual-mode color tuning based on upconversion core/triple-shell nanostructure

Supplementary files

Article information

Article type
Paper
Submitted
31 okt 2018
Accepted
09 feb 2019
First published
12 feb 2019

J. Mater. Chem. C, 2019,7, 3342-3350

Dual-mode color tuning based on upconversion core/triple-shell nanostructure

L. Lei, X. Dai, Y. Cheng, Y. Wang, Z. Xiao and S. Xu, J. Mater. Chem. C, 2019, 7, 3342 DOI: 10.1039/C8TC05467C

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