Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeiting

Abstract Lanthanide-doped upconversion nanomaterials are emerging as promising candidates in optoelectronics, volumetric display, anti-counterfeiting as well as biological imaging and therapy. Typical modulations of upconversion through chemical methods, such as controlling phase, composition, morph...

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Main Authors: Yingdong Han, Hongyu Li, Yangbo Wang, Yue Pan, Ling Huang, Feng Song, Wei Huang
Format: Article
Language:English
Published: Nature Publishing Group 2017-05-01
Series:Scientific Reports
Online Access:https://doi.org/10.1038/s41598-017-01611-9
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spelling doaj-0d29b1b1f617430f8a18e14fc3668c5b2020-12-08T03:18:57ZengNature Publishing GroupScientific Reports2045-23222017-05-01711810.1038/s41598-017-01611-9Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeitingYingdong Han0Hongyu Li1Yangbo Wang2Yue Pan3Ling Huang4Feng Song5Wei Huang6School of Physics & The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai UniversityKey Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech)Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech)School of Chemistry and Chemical Engineering, Inner Mongolia UniversityKey Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech)School of Physics & The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai UniversitySchool of Physics & The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai UniversityAbstract Lanthanide-doped upconversion nanomaterials are emerging as promising candidates in optoelectronics, volumetric display, anti-counterfeiting as well as biological imaging and therapy. Typical modulations of upconversion through chemical methods, such as controlling phase, composition, morphology and size enable us to rationally manipulate emission profiles and lifetimes of lanthanide ions by using continuous-wave laser excitation. Here we demonstrate that under pulsed laser excitation the emission color of NaYF4:Er/Tm (2/0.5%)@NaYF4 core-shell nanoparticles has an obvious transformation from green to red colors. Moreover, both pulse duration and repetition frequency are responsible for manipulating the upconversion emission color. The mechanism of the phenomena may be that the pulsed laser sequence triggers the emission levels to non-steady upconversion states first, and then cuts off the unfinished population process within the pulse duration. This pump source dependent and resultant tunable fluorescence emission enables NaYF4:Er/Tm (2/0.5%)@NaYF4 nanoparticles as a promising fluorophore in the transparent anti-fake printing.https://doi.org/10.1038/s41598-017-01611-9
collection DOAJ
language English
format Article
sources DOAJ
author Yingdong Han
Hongyu Li
Yangbo Wang
Yue Pan
Ling Huang
Feng Song
Wei Huang
spellingShingle Yingdong Han
Hongyu Li
Yangbo Wang
Yue Pan
Ling Huang
Feng Song
Wei Huang
Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeiting
Scientific Reports
author_facet Yingdong Han
Hongyu Li
Yangbo Wang
Yue Pan
Ling Huang
Feng Song
Wei Huang
author_sort Yingdong Han
title Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeiting
title_short Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeiting
title_full Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeiting
title_fullStr Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeiting
title_full_unstemmed Upconversion Modulation through Pulsed Laser Excitation for Anti-counterfeiting
title_sort upconversion modulation through pulsed laser excitation for anti-counterfeiting
publisher Nature Publishing Group
series Scientific Reports
issn 2045-2322
publishDate 2017-05-01
description Abstract Lanthanide-doped upconversion nanomaterials are emerging as promising candidates in optoelectronics, volumetric display, anti-counterfeiting as well as biological imaging and therapy. Typical modulations of upconversion through chemical methods, such as controlling phase, composition, morphology and size enable us to rationally manipulate emission profiles and lifetimes of lanthanide ions by using continuous-wave laser excitation. Here we demonstrate that under pulsed laser excitation the emission color of NaYF4:Er/Tm (2/0.5%)@NaYF4 core-shell nanoparticles has an obvious transformation from green to red colors. Moreover, both pulse duration and repetition frequency are responsible for manipulating the upconversion emission color. The mechanism of the phenomena may be that the pulsed laser sequence triggers the emission levels to non-steady upconversion states first, and then cuts off the unfinished population process within the pulse duration. This pump source dependent and resultant tunable fluorescence emission enables NaYF4:Er/Tm (2/0.5%)@NaYF4 nanoparticles as a promising fluorophore in the transparent anti-fake printing.
url https://doi.org/10.1038/s41598-017-01611-9
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