Synthesis of K_2SiF_6:Mn~(4+) Phosphor from SiO_2 Powders via Redox Reaction in HF/KMnO_4 Solution and Their Application in Warm-White LED

摘要

In this article, we propose a facile method for synthesis of K_2SiF_6:Mn~(4 +) phosphor and discuss its promising application in warm-white light emitting diodes (LED). The K_2SiF_6:Mn~(4+) was synthesized from SiO_2 powders through redox reaction in HF/KMnO_4 solution. The optical properties of LEDs containing different ratios of K_2SLF_6:Mn~(4+) phosphor and commercial Ce~(3+)-doped garnets (YAG-40) yellow-green phosphor were studied. A warm-white LED, with color temperature of 3510 K and color rendering index of 90.9 and efficacy of 81.56 lm/W was demonstrated.