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

Abstract

Manipulating upconversion (UC) emission color by external field allows access to many novel applications. Although such control based on the multi-color UC nanocrystals (NCs) have been reported, it is still a challenge to construct multi-mode responsive system which may enable multifunctionality within one single nanostructure. Herein, an integrated core/triple-shell nanostructure, where different activators are spatially separated, is applied for a dual-mode manipulation of UC emission color. The 3-photon dominant UC emission intensity of Tm3+ ions enhances more than 2-photon counterpart of Er3+ ions with increasing the excitation power, leading to the excitation power induced color variation. On the other hand, the UC emission intensity of Er3+ activators in the core exhibit thermal quenching effect, while that of Tm3+ ions in the second-shell show near-zero thermal quenching effect in the visible region, which contributes to the thermal 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 bi-functionality that can find potential applications in temperature sensing and anti-counterfeiting fields.

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Publication details

The article was received on 31 Oct 2018, accepted on 09 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C8TC05467C
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    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, Accepted Manuscript , DOI: 10.1039/C8TC05467C

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