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  Remarkable enhancement of the near-infrared upconversion emission in the β-NaYF4:Yb3+/Tm3+ system with controllable morphology

Liu, B.-Q., Wang, J., Zhu, L.-L., Zhang, H., Chen, H.-H., Xu, F.-F., et al. (2014). Remarkable enhancement of the near-infrared upconversion emission in the β-NaYF4:Yb3+/Tm3+ system with controllable morphology. Materials Research Bulletin, 51, 180-184. doi:10.1016/j.materresbull.2013.11.057.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-A66D-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-4A3F-7
Genre: Journal Article

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 Creators:
Liu, Bi-Qiu1, Author
Wang, Jiao1, Author
Zhu, Lin-Lin1, Author
Zhang, Hui1, Author
Chen, Hao-Hong1, Author
Xu, Fang-Fang1, Author
Guo, Kai2, Author              
Zhao, Jing-Tai1, Author
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1External Organizations, ou_persistent22              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              

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 Abstract: In this work, beta-NaYF4:Yb3+/Tm3+ samples with controllable morphologies have been prepared using a facile hydrothermal method. The overall morphologies of the samples can be adjusted from rod-shape to hexagonal prism-shape with crown-like top end, and then to hexagonal plate-shape by increasing the pH values of initial solutions ranging from 3 to 9. Furthermore, the pH values of the initial solutions show great effect on upconversion emissions of the samples, and it is worth noting that higher both near-infrared emission and chromatic purity are observed for the samples obtained under lower pH values conditions. The corresponding mechanism may be attributed to the combination of more Yb3+ ions incorporated in the lattice and the reduced lattice constants under the condition of lower pH values, favoring energy transfer between Yb3+ and Tm3+ ions or between two neighboring Tm3+ ions. (C) 2013 Elsevier Ltd. All rights reserved.

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 Dates: 2014-03-01
 Publication Status: Published in print
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Title: Materials Research Bulletin
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 51 Sequence Number: - Start / End Page: 180 - 184 Identifier: ISSN: 0025-5408
CoNE: /journals/resource/954926251623