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

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

Content Provider	Semantic Scholar
Author	Wang, Zhengliang Liu, Yong Zhou, Yayun Zhou, Qiang Tan, Huiying Zhang, Qiuhan Peng, Jin-Hui
Copyright Year	2015
Abstract	Red-emitting phosphors Na2XF6:Mn4+ (X = Si, Ge, Ti) were synthesized by a simple co-precipitation method. The crystal structure, morphology and composition of as-prepared phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometer (EDS) and atomic absorption spectroscopy (AAS). Their optical properties were investigated by photo-luminescent spectra (PL), diffuse reflectance spectra (DRS), and the luminescence decay curves. These phosphors exhibit broad excitation band in blue regions and intense emission in red regions with high color-purity. The sample Na2SiF6:Mn4+ shares bright red emission under blue light excitation, and its CIE coordinates are x = 0.684, y = 0.315, which are close to the NTSC (National Television Standard Committee) standard values for red (x = 0.67, y = 0.33). The white-light-emitting diodes (WLEDs) fabricated with this phosphor emits intense warm white-light with lower color temperature (3930 K) and higher color rendering index (92.3). The above results indicated that red phosphor Na2SiF6:Mn4+ maybe serve as a red-emitting phosphor for application in warm WLEDs.
Starting Page	58136
Ending Page	58140
Page Count	5
File Format	PDF HTM / HTML
DOI	10.1039/C5RA10568D
Volume Number	5
Alternate Webpage(s)	http://www.rsc.org/suppdata/c5/ra/c5ra10568d/c5ra10568d1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C5RA10568D
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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