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Enhancing negative thermal quenching effect via low-valence doping in two-dimensional confined core–shell upconversion nanocrystals

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Abstract

Luminescent materials with negative thermal quenching effects show superior potentials in temperature sensing and anti-counterfeiting fields. Normally, smaller nanocrystals (NCs) with higher surface-to-volume ratios are used to achieve larger thermal-induced intensification of upconversion (UC) emission intensity. Herein, confining sensitizers and activators to the shell layer with two-dimensional space and introducing defect energy levels via doping low-valence ions are simultaneously applied to enhance the negative thermal quenching effect. By increasing the temperature from 293 K to 413 K, the integral UC emission intensity of 20Yb/2Er:NaGdF4 increases only by ∼2.2 times, whereas that of NaGdF4@20Ca/20Yb/2Er:NaGdF4 core–shell NCs with a similar particle size increases by ∼10.9 times.

Graphical abstract: Enhancing negative thermal quenching effect via low-valence doping in two-dimensional confined core–shell upconversion nanocrystals

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Publication details

The article was received on 01 Sep 2018, accepted on 05 Oct 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8TC04392B
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Enhancing negative thermal quenching effect via low-valence doping in two-dimensional confined core–shell upconversion nanocrystals

    L. Lei, J. Xia, Y. Cheng, Y. Wang, G. Bai, H. Xia and S. Xu, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC04392B

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