NDLI: Enhancement of white-light-emission from single-phase $Sr_{5}(PO_{4})_{3}F:Eu^{2+},Mn^{2+}$ phosphors for near-UV white LEDs

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Huang, Jinping Liu, Jie Feng, Yaomiao Yu, Xibin Liu, Lili
Description	Author Affiliation: Feng Y ( Shanghai Key Laboratory of Rare Earth Functional Materials, Department of Chemistry, Shanghai Normal University, Shanghai 200234, China. hjinping@shnu.edu.cn.)
Abstract	A series of single-phase broadband white-light-emitting $Sr_{5}(PO_{4})_{3}F:Eu^{2+},Mn^{2+}$ phosphors were prepared by a solid state reaction. The luminescence property, and the crystal and electronic structures of the fluorophosphates were studied by photoluminescence analysis, XRD Rietveld refinement and density functional theory calculation (DFT), respectively. Under near ultraviolet excitation in the 250 to 430 nm wavelength range, the phosphors exhibit two emission bands centered at 440 and 556 nm, caused by the $Eu^{2+}$ and $Mn^{2+}$ ions. By altering the relative ratios of $Eu^{2+}$ and $Mn^{2+}$ in the compounds, the emission color could be modulated from blue to white. The efficient energy transfer from the $Eu^{2+}$ to $Mn^{2+}$ ions could be ascribed to the well crystallized host lattice and the facile substitution of $Eu^{2+}$ and $Mn^{2+}$ for $Sr^{2+}$ sites due to similar ionic radii. A series of fluxes were investigated to improve the photoluminescence intensity. When KCl was used as flux in the synthesis, the photoluminescence intensity of $Sr_{5}(PO_{4})_{3}F:Eu^{2+},Mn^{2+}$ was enhanced by 85% compared with no fluxes added. These results demonstrate that the single-phase $Sr_{5}(PO_{4})_{3}F:Eu^{2+},Mn^{2+}$ with enhanced luminescence efficiency could be promising as a near UV-convertible direct white-light-emitting phosphor for WLED applications.
ISSN	14779226
Issue Number	33
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-09-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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