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Sequential Growth of Uniform β-NaYF4@β-NaLnF4 (Ln = Y, Lu, Yb) Microcrystals with Luminescent Properties of Multicolor Tuning and Dual-Mode Emission

1
School of Physics, Nankai University, Tianjin 300071, China
2
The Collaborative Innovation Center of Extreme Optical, Nankai University, Tianjin 300071, China
3
School of Biomedical Engineering, Tianjin Medical University, Tianjin 300070, China
4
School of Science, Tianjin University of Science & Technology, Tianjin 300457, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2017, 7(12), 448; https://doi.org/10.3390/nano7120448
Received: 13 November 2017 / Revised: 8 December 2017 / Accepted: 11 December 2017 / Published: 14 December 2017
We synthesized the uniform core-shell microstructured compounds with hexagonal phase NaYF4:Er/Yb microrods as the core and hexagonal phase NaLnF4 (NaYbF4, NaLuF4:Yb/Tm, NaYF4:Yb/Er, NaYF4:Eu) as the shell based on the hydrothermal reaction. These microscale core-shell structures provided a platform for the spatially confining optical process while possessing high luminescence efficiency. The thickness of the shell could be controlled by adjusting the amounts of shell precursor, which significantly affected the intensity of the shell dopant ions emission and the emission color of core-shell upconversion luminescence (UCL). The uniform NaYF4@NaLnF4 (Ln = Y, Lu, Yb) microrods, with a series of rare-earth ions doped into the core and shell layer at various doping concentrations, achieved color-tuning of the upconversion (UC) emission and dual-mode emission at the single-microcrystal level, thus allowing the efficient utilization of core-shell microcrystals in the photonics and security labeling. This study suggests a new class of luminescent materials in the microscopic field. View Full-Text
Keywords: NaYF4 microcrystals; microscale core-shell structures; multicolor tuning; dual-mode emission NaYF4 microcrystals; microscale core-shell structures; multicolor tuning; dual-mode emission
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Ju, D.; Song, F.; Han, Y.; Cui, W.; Zhou, A.; Liu, S.; Wang, X.; Feng, M.; Ming, C. Sequential Growth of Uniform β-NaYF4@β-NaLnF4 (Ln = Y, Lu, Yb) Microcrystals with Luminescent Properties of Multicolor Tuning and Dual-Mode Emission. Nanomaterials 2017, 7, 448.

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