Red-emitting phosphors Na2XF6:Mn4+(X = Si, Ge, Ti) with high colour-purity for warm white-light-emitting diodes

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58136-58140 ◽  
Author(s):  
Zhengliang Wang ◽  
Yong Liu ◽  
Yayun Zhou ◽  
Qiang Zhou ◽  
Huiying Tan ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Precipitation Method ◽  
Light Emitting ◽  
Warm White Light ◽  
Co Precipitation ◽  
White Light Emitting Diodes

Red hexafluoride phosphors were synthesized by a simple co-precipitation method. WLEDs fabricated with as-prepared phosphors emit intense warm white-light under 20 mA current excitation. Therefore, they may find application in warm WLEDs.

Co-precipitation Synthesis and Luminescence Properties of Na2TiF6∶Mn4+Red Phosphors for Warm White Light Emitting Diodes

2015 ◽  
Vol 36 (12) ◽  
pp. 1402-1408 ◽  
Author(s):  
罗 洋 LUO Yang ◽  
江建青 JIANG Jian-qing ◽  
侯得健 HOU De-jian ◽  
游维雄 YOU Wei-xiong ◽  
叶信宇 YE Xin-yu
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Luminescence Properties ◽  
Light Emitting ◽  
Red Phosphors ◽  
Warm White Light ◽  
Precipitation Synthesis ◽  
Co Precipitation ◽  
White Light Emitting Diodes

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

2019 ◽  
Vol 807 ◽  
pp. 101-109
Author(s):  
Di Wu ◽  
Xin Yu Ye ◽  
Lin Sheng Wang ◽  
Qing Hua Zeng
Keyword(s):  
White Light ◽  
Luminescent Properties ◽  
Color Temperature ◽  
Precipitation Method ◽  
Light Emitting ◽  
Warm White Light ◽  
Co Precipitation ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Fluorescence Spectrometer

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 2Eg-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.

53% Efficient Red Emissive Carbon Quantum Dots for High Color Rendering and Stable Warm White‐Light‐Emitting Diodes

2017 ◽  
Vol 29 (37) ◽  
pp. 1702910 ◽  
Author(s):  
Zifei Wang ◽  
Fanglong Yuan ◽  
Xiaohong Li ◽  
Yunchao Li ◽  
Haizheng Zhong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Light Emitting Diodes ◽  
Carbon Quantum Dots ◽  
Light Emitting ◽  
Warm White Light ◽  
White Light Emitting Diodes ◽  
Color Rendering

Tunable full-color-emitting La0.827Al11.9O19.09:Eu2+,Mn2+ phosphor for application to warm white-light-emitting diodes

2006 ◽  
Vol 89 (23) ◽  
pp. 231909 ◽  
Author(s):  
Yu-Ho Won ◽  
Ho Seong Jang ◽  
Won Bin Im ◽  
Duk Young Jeon ◽  
Jeong Soo Lee
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Full Color ◽  
Warm White Light ◽  
White Light Emitting Diodes
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