Co-Precipitation Synthesis and Photoluminescence Properties of K₂SiF₆:Mn⁴⁺ Red Phosphor for White Light Emitting Diodes

Abstract:

A novel red-emitting K₂SiF₆:Mn⁴⁺ phosphors with different Mn⁴⁺ doping mole fraction were synthesized by co-precipitation method. X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR) and fluorescence spectrometer were used to characterize the properties of K₂SiF₆:Mn⁴⁺ phosphors. As-prepared K₂SiF₆:Mn⁴⁺ phosphors have cubic crystal structure. Under excitation at 450 nm, an intense red emission peak around 632 nm corresponding to the ²E_g-⁴A₂ transition of Mn⁴⁺ was observed for 8.37 mol% K₂SiF₆:Mn⁴⁺ phosphors and was used as the optimum doping concentration. The excellent luminescent properties make the phosphor K₂SiF₆:Mn⁴⁺ a candidate for applications in InGaN-YAG:Ce³⁺ type LEDs for high color rendering. “A warm” white light LED with an efficiency of 147 lm/w and a color rendering index of 87.4 at a color temperature of 2864K has been obtained by fabricating YAG:Ce³⁺ with K₂SiF₆:Mn⁴⁺ on an InGaN chip.

• Periodical: Key Engineering Materials (Volume 807)
• Pages: 101-109
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.807.101
• Online since: June 2019
• Authors: Di Wu*, Xin Yu Ye, Lin Sheng Wang, Qing Hua Zeng
• Keywords: Co-Precipitation, Fluoride Phosphor, K₂SiF₆:Mn⁴⁺, White LEDs

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