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

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Guo,  Kai
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-A66D-8
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.