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https://doi.org/10.3938/NPSM.69.410
Study on the Emitting Property and the Color Gamut of K$_\text{2}$SiF$_\text{6}$:Mn$^\text{4+}$ Phosphor-Based White-Light Emitting Diodes
New Phys.: Sae Mulli 2019; 69: 410~415
Published online April 30, 2019;  https://doi.org/10.3938/NPSM.69.410
© 2019 New Physics: Sae Mulli.

Ji Soo PARK, Seung Jin KIM, Moongyu JANG, Jae-Hyeon KO*.

School of Nano Convergence Technology, Nano Convergence Technology Center, Hallym University, Gangwon 24252, Korea
Correspondence to: hwangko@hallym.ac.kr
Received February 15, 2019; Revised March 8, 2019; Accepted March 12, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
White-light emitting diodes (LEDs) based on K$_2$SiF$_6$:Mn$^{4+}$ (KSF) red and Lu$_3$Al$_5$O$_{12}$:Ce$^{3+}$ (LuAG) green phosphors were fabricated and compared to the conventional yellow Y$_3$Al$_5$O$_{12}$:Ce$^{3+}$ (YAG) phosphor-based white LED. The emitting spectrum of the KSF-based white LED was measured as a function of the driving current and the temperature. The changes in the color coordinates of the KSF-based white LED over wide current and temperature ranges were less than 0.01, which are substantially smaller than those of the YAG-based white LEDs. This demonstrates that the thermal stability of the KSF- and the LuAG-based white LEDs is high compared to that of the conventional white LEDs. The color gamut of the KSF-based white LED is more than 92\%, which is much higher than 74\% of the YAG-based white LED. This result is mainly due to the sharper emission peaks of the KSF and the LuAG phosphors.
PACS numbers: 42.15.Eq, 42.79.Kr
Keywords: LCD, Backlight, White LED, Color gamut


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