Phase transformation and morphology tuning of β-NaYF4: Yb3+, Er3+ nanocrystals through K+ ions codoping

doi:10.1088/1674-1056/24/3/037801

Abstract In this work, a simple method to modulate the crystal phase and morphology with a large amount of K⁺ ions codoping is proposed. The phase changes to the mixture of β-NaYF₄ and β -KYF₄ with increasing the content of K⁺ ions to 80 mol%. When it exceeds 80 mol%, β -NaYF₄ disappears gradually and β -KYF₄ dominates with a poor crystalline. In addition, the morphology changes from nanosphere to nanoplate, and then to nanoprism, which indicates that a higher content of K⁺ ions favors the growth rates along [0001] than the [10-10] of the nanocrystals. Additionally, the upconversion (UC) luminescence properties and the ratio of red/green (R/G) UC intensity of samples with different phases and morphologies are detected, which makes it possible to tune the UC fluorescence by varying the concentration of K⁺ ions.

Keywords: upconversion fluorescence NaYF₄:Yb Er K⁺ ions codoping

Received: 28 July 2014
Revised: 16 October 2014
Accepted manuscript online:

PACS:	78.40.-q	(Absorption and reflection spectra: visible and ultraviolet)
	74.25.Gz	(Optical properties)
	42.70.-a	(Optical materials)
	78.67.Bf	(Nanocrystals, nanoparticles, and nanoclusters)

Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2013AA032205), the National Natural Science Foundation of China (Grant No. 51272022), and the Fundamental Research Funds for the Central Universities, China (Grant No. 2012JBZ001).

Corresponding Authors: Zhao Su-Ling
E-mail: slzhao@bjtu.edu.cn

Cite this article:

Liang Zhi-Qin (梁志琴), Zhao Su-Ling (赵谡玲), Cui Yue (崔越), Tian Li-Jiao (田丽娇), Zhang Jun-Jie (张俊杰), Xu Zheng (徐征) Phase transformation and morphology tuning of β-NaYF₄: Yb³⁺, Er³⁺ nanocrystals through K⁺ ions codoping 2015 Chin. Phys. B 24 037801

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Phase transformation and morphology tuning of β-NaYF4: Yb3+, Er3+ nanocrystals through K+ ions codoping

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Phase transformation and morphology tuning of β-NaYF₄: Yb³⁺, Er³⁺ nanocrystals through K⁺ ions codoping