Issue 28, 2019

Regulating the color output and simultaneously enhancing the intensity of upconversion nanoparticles via a dye sensitization strategy

Abstract

Color-modulated upconversion nanoparticles (UCNPs) have garnered widespread optical applications owing to their superior properties, including low auto-fluorescence background noise, large anti-Stokes shift, and distinguishable sharp emission bands. Recent success in multicolor alteration of UCNPs has mostly relied on the cross-relaxation between activators and other elements, which allows them to perform excellently in optical encoding and bioimaging. However, the color modulation is subject to the cross-relaxation strategy, which heavily weakens the original emission intensity of the activators. Herein, we report a dye-sensitization strategy of conjugating strong near-infrared absorptive dyes on the surface of UCNPs. It was proven that dye sensitization can manipulate the red to green (R/G) emission ratio of NaYF4:Yb/Er@NaYF4:Nd UCNPs and simultaneously enhance their luminescence intensity. The R/G emission ratio can be tuned to increase or decrease, benefiting from the dye sensitization strategy. Proof of concept was demonstrated for anti-counterfeiting application under orthogonal excitation of 808 nm and 980 nm.

Graphical abstract: Regulating the color output and simultaneously enhancing the intensity of upconversion nanoparticles via a dye sensitization strategy

Supplementary files

Article information

Article type
Paper
Submitted
30 Apr 2019
Accepted
16 Jun 2019
First published
19 Jun 2019

J. Mater. Chem. C, 2019,7, 8607-8615

Regulating the color output and simultaneously enhancing the intensity of upconversion nanoparticles via a dye sensitization strategy

B. Xue, D. Wang, Y. Zhang, J. Zuo, Y. Chang, L. Tu, X. Liu, Z. Yuan, H. Zhao, J. Song, J. Qu and X. Kong, J. Mater. Chem. C, 2019, 7, 8607 DOI: 10.1039/C9TC02293G

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