Hydrothermal synthesis of K+/Na+ codoped ZnWO4:Yb3+,Tm3+ nanophosphor for greatly enhanced NIR up-conversion luminescence

K+/Na+ doped ZnWO4:Yb3+,Tm3+ nanophosphors were successfully synthesized via malate assisted hydrothermal reaction at 180 °C for 24 h, followed by calcination at 700 °C for 2 h, and K+/Na+ incorporation was demonstrated to significantly affect the up-conversion (UC) and down-conversion (DC) luminesc...

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Main Authors: Meiting Li, Xuejiao Wang, Qi Zhu, Ji-Guang Li, Byung-Nam Kim
Format: Article
Language:English
Published: Elsevier 2021-05-01
Series:Journal of Materials Research and Technology
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785421001988
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spelling doaj-886bd0454a7e4dc8bf713c81d508096c2021-05-24T04:30:23ZengElsevierJournal of Materials Research and Technology2238-78542021-05-0112117124Hydrothermal synthesis of K+/Na+ codoped ZnWO4:Yb3+,Tm3+ nanophosphor for greatly enhanced NIR up-conversion luminescenceMeiting Li0Xuejiao Wang1Qi Zhu2Ji-Guang Li3Byung-Nam Kim4Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, 110819, PR China; Research Center for Advanced Ceramic Materials, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, 110819, PR China; Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, JapanCollege of Chemistry and Materials Engineering, Bohai University, Jinzhou, Liaoning, 121007, PR ChinaKey Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, 110819, PR China; Research Center for Advanced Ceramic Materials, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, 110819, PR ChinaResearch Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan; Corresponding author.Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, JapanK+/Na+ doped ZnWO4:Yb3+,Tm3+ nanophosphors were successfully synthesized via malate assisted hydrothermal reaction at 180 °C for 24 h, followed by calcination at 700 °C for 2 h, and K+/Na+ incorporation was demonstrated to significantly affect the up-conversion (UC) and down-conversion (DC) luminescence of Tm3+. The best luminescent ZnWO4:0.08 Yb3+,0.02 Tm3+ phosphor, which contains ~4.8 at% of Na+ and 0.3 at% of K+, showed intensities ~11 and 20 times those of the phosphor containing only ~3 at% of Na+ for the 483 nm blue and 807 nm NIR UC, respectively, and has a much longer lifetime of ~468.10 ± 0.51 μs for the NIR emission. It was analyzed that the blue and NIR emissions occur via three- and two-photon processes, respectively, and have a high I807/I484 intensity ratio of ~185. Analysis of DC luminescence further confirmed the beneficial effect of K+/Na+ doping and found the co-presence of broad-band emission from [WO6]6- (3T1u → 1A1g transition, ~425–700 nm) and narrow-band emissions from Tm3+ (intra-4f12 transition, at 483, 619 and 653 nm). The effect of Na+/K+ was discussed with the observed UC/DC luminescence properties.http://www.sciencedirect.com/science/article/pii/S2238785421001988ZnWO4:Yb3+,Tm3+ phosphorK+/Na+ dopingDown-/up-conversion luminescenceFluorescence lifetime
collection DOAJ
language English
format Article
sources DOAJ
author Meiting Li
Xuejiao Wang
Qi Zhu
Ji-Guang Li
Byung-Nam Kim
spellingShingle Meiting Li
Xuejiao Wang
Qi Zhu
Ji-Guang Li
Byung-Nam Kim
Hydrothermal synthesis of K+/Na+ codoped ZnWO4:Yb3+,Tm3+ nanophosphor for greatly enhanced NIR up-conversion luminescence
Journal of Materials Research and Technology
ZnWO4:Yb3+,Tm3+ phosphor
K+/Na+ doping
Down-/up-conversion luminescence
Fluorescence lifetime
author_facet Meiting Li
Xuejiao Wang
Qi Zhu
Ji-Guang Li
Byung-Nam Kim
author_sort Meiting Li
title Hydrothermal synthesis of K+/Na+ codoped ZnWO4:Yb3+,Tm3+ nanophosphor for greatly enhanced NIR up-conversion luminescence
title_short Hydrothermal synthesis of K+/Na+ codoped ZnWO4:Yb3+,Tm3+ nanophosphor for greatly enhanced NIR up-conversion luminescence
title_full Hydrothermal synthesis of K+/Na+ codoped ZnWO4:Yb3+,Tm3+ nanophosphor for greatly enhanced NIR up-conversion luminescence
title_fullStr Hydrothermal synthesis of K+/Na+ codoped ZnWO4:Yb3+,Tm3+ nanophosphor for greatly enhanced NIR up-conversion luminescence
title_full_unstemmed Hydrothermal synthesis of K+/Na+ codoped ZnWO4:Yb3+,Tm3+ nanophosphor for greatly enhanced NIR up-conversion luminescence
title_sort hydrothermal synthesis of k+/na+ codoped znwo4:yb3+,tm3+ nanophosphor for greatly enhanced nir up-conversion luminescence
publisher Elsevier
series Journal of Materials Research and Technology
issn 2238-7854
publishDate 2021-05-01
description K+/Na+ doped ZnWO4:Yb3+,Tm3+ nanophosphors were successfully synthesized via malate assisted hydrothermal reaction at 180 °C for 24 h, followed by calcination at 700 °C for 2 h, and K+/Na+ incorporation was demonstrated to significantly affect the up-conversion (UC) and down-conversion (DC) luminescence of Tm3+. The best luminescent ZnWO4:0.08 Yb3+,0.02 Tm3+ phosphor, which contains ~4.8 at% of Na+ and 0.3 at% of K+, showed intensities ~11 and 20 times those of the phosphor containing only ~3 at% of Na+ for the 483 nm blue and 807 nm NIR UC, respectively, and has a much longer lifetime of ~468.10 ± 0.51 μs for the NIR emission. It was analyzed that the blue and NIR emissions occur via three- and two-photon processes, respectively, and have a high I807/I484 intensity ratio of ~185. Analysis of DC luminescence further confirmed the beneficial effect of K+/Na+ doping and found the co-presence of broad-band emission from [WO6]6- (3T1u → 1A1g transition, ~425–700 nm) and narrow-band emissions from Tm3+ (intra-4f12 transition, at 483, 619 and 653 nm). The effect of Na+/K+ was discussed with the observed UC/DC luminescence properties.
topic ZnWO4:Yb3+,Tm3+ phosphor
K+/Na+ doping
Down-/up-conversion luminescence
Fluorescence lifetime
url http://www.sciencedirect.com/science/article/pii/S2238785421001988
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