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Optimized Photoluminescence of K$_{2}$SiF$_{6}$:Mn$^{4+}$ Phosphors for LED Solid-state Lighting
New Physics: Sae Mulli 2016; 66: 311~316
Published online March 31, 2016;
© 2016 New Physics: Sae Mulli.

Do Young JEONG, Jinsik JU, Do Hyung KIM*

Nano-Applied Physics Laboratory (NAPL), Department of Physics, Kyungpook National University, Daegu 41566, Korea
Correspondence to:
Received December 14, 2015; Revised January 19, 2016; Accepted January 19, 2016.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Red-emitting K$_{2}$SiF$_{6}$:Mn$^{4+}$ phosphors were synthesized by using the redox reaction in aqueous solutions mixed with SiO$_{2}$, KMnO$_{4}$, HF, and H$_{2}$O$_{2}$. The photoluminescence (PL) spectrum of the as-synthesized K$_{2}$SiF$_{6}$:Mn$^{4+}$ phosphors showed a narrow emission band with 5 peaks in the wavelength range from 610 to 650 nm. The main peak at 630 nm had a narrow full width at half maximum (FWHM) ($<$10 nm).  The emission intensity of the K$_{2}$SiF$_{6}$:Mn$^{4+}$ phosphor ex'd at 460 nm was about 2.5 times higher than that of the phosphor excited at 365 nm. The K$_{2}$SiF$_{6}$:Mn$^{4+}$ samples synthesized with a ratio of SiO$_{2}$:KMnO$_{4}$ = 0.2:1 exhibited the best luminescence intensity. The K$_{2}$TiF$_{6}$:Mn$^{4+}$ phosphors were synthesized by using the cation exchange method in order to compare its luminescent properties with those of the K$_{2}$SiF$_{6}$:Mn$^{4+}$ phosphors, and the luminescent intensity of the K$_{2}$SiF$_{6}$:Mn$^{4+}$ phosphors was about 1.5 times higher than that of the K$_{2}$TiF$_{6}$:Mn$^{4+}$ phosphors. Thus, the K$_{2}$SiF$_{6}$:Mn$^{4+}$ phosphors may be considered to be efficient red-emitting phosphors for blue-emitting GaN light-emitting diodes.
PACS numbers: 78.55.Hx
Keywords: Phosphors, K$_{2}$SiF$_{6}$:Mn$^{4+}$, Photoluminescence, LED, Cation exchange method

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