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Updated: Feb 2, 2026

Triplet Fusion Upconversion Nanocapsule Synthesis
Published on: September 7, 2022
Effect of NaF Removal on the Upconversion Phosphor NaYF₄:Yb3+, Tm3
1Korea Multi-Purpose Accelerator Complex, Korea Atomic Energy Research Institute, Gyeongju, 38180, Korea.
Abstract:
To improve the light conversion efficiency of the upconversion phosphor NaYF₄:Yb3+, Tm3+ for use in solar cells, its phosphor surface was treated by removing the NaF phase from the surface of the NaYF₄ host crystals. The surface of the phosphor was treated by a simple procedure consisting of washing, filtering, and drying. It is confirmed that the NaF compound is efficiently eliminated from the surface of NaYF₄-based phosphors by this surface treatment. The experimental results strongly suggest that the removal of NaF from the surface of the NaYF₄:Yb3+, Tm3+ phosphor reduces surface defects and enhances the photoluminescence characteristics of upconversion phosphors.
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