Synthesis of narrow-band red-emitting K2SiF6:Mn4+ phosphors for a deep red monochromatic LED and ultrahigh color quality warm-white LEDs

被引:160
作者
Oh, Ji Hye [1 ]
Kang, Heejoon [1 ]
Eo, Yun Jae [1 ]
Park, Hoo Keun [1 ]
Do, Young Rag [1 ]
机构
[1] Kookmin Univ, Dept Chem, Seoul 136702, South Korea
基金
新加坡国家研究基金会;
关键词
LIGHT; LAMPS;
D O I
10.1039/c4tc02042a
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, we synthesized and characterized narrow-band red-emitting K2SiF6:Mn4+ phosphors in order to improve the color qualities of warm white light-emitting diodes (LEDs). The deep red monochromatic LED was realized by fabricating a long wavelength pass dichroic filter (LPDF)-capped phosphor-converted LED (pc-LED) with a synthesized K2SiF6:Mn4+ phosphor. In addition, we introduced four-package white LEDs that combine InGaN blue (B) LED and LPDF-capped green (G), amber (A), and red (R) pc-LEDs to achieve the high color rendition at the warm white correlated color temperatures (CCTs, 2700 K) with the assistance of the narrow-band K2SiF6:Mn4+ red phosphor. We compared the optical properties, including the luminous efficacy (LE), luminous efficacy of radiation (LER), color rendering index (CRI), special CRI for strong red (R-9), and color quality scale (CQS), of four-package white LEDs by varying the red pc-LED with one narrow-band red-emitting phosphor and five wide-band red-emitting phosphors. The RAGB four-package white LED using narrow-band red-emitting K2SiF6:Mn4+ phosphor exhibited high LE (107 lm W-1) and ultrahigh color qualities (CRI = 94, R-9 = 93, and CQS = 93) at a CCT of 2700 K.
引用
收藏
页码:607 / 615
页数:9
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