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. 2020 Dec 10;10(12):2477. doi: 10.3390/nano10122477

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Photoluminescence spectra of LaF₃:Yb³⁺/Er³⁺/Ho³⁺/Tm³⁺ core nanoparticles with different mole concentrations of Er³⁺, Ho³⁺, and Tm³⁺ under 980 nm near-infrared (NIR) irradiation. The inset in each figure (a–h) is the corresponding luminescence photograph of the core UCNP in the solution.

Photoluminescence spectra of LaF₃:Yb³⁺/Er³⁺/Ho³⁺/Tm³⁺ core nanoparticles with different mole concentrations of Er³⁺, Ho³⁺, and Tm³⁺ under 980 nm near-infrared (NIR) irradiation. The inset in each figure (a–h) is the corresponding luminescence photograph of the core UCNP in the solution.