Warm white light from Y4MgSi3O13:Bi3+, Eu3+ nanophosphor for white light-emitting diodes.
Y(4)MgSi(3)O(13):Bi(3+), Eu(3+) nanophosphors have been prepared by a facile sol-gel method. The products have been characterized by X-ray diffraction, field-emission scanning electron microscopy and fluorescence measurements. The results show that the nanophosphors are of single phase hexagonal Y(4)MgSi(3)O(13) with size-distribution of 50-90 nm in diameter. White-light emission has been obtained from Bi(3+) and Eu(3+) co-doped Y(4)MgSi(3)O(13) nanophosphors upon excitation of 350 nm ultraviolet light. It is noted that Bi(3+) ions can occupy two different Y(3+) sites and generate different emissions from the (3)p(1) --> (1)s(0) transition. Warm white light has been obtained from Y(4)MgSi(3)O(13):Bi(3+), Eu(3+) nanophosphors according to Commission International de I'Eclairage (CIE) chromaticity coordinates and color temperature (T(c)) with appropriately adjusted contents of Bi(3+) and Eu(3+). The results indicate that Y(4)MgSi(3)O(13):0.08Bi(3+), 0.04Eu(3+) (x = 0.31, y = 0.31, T(c) = 6907 K) are potential nanophosphors for white light-emitting diodes (LEDs) applications.
Xiao
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MOE Key Lab of Specially Functional Materials and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, PR China.
Xue
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Zhang
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QY
D001729:Bismuth / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D005453:Fluorescence; D008027:Light; D008029:Lighting / Q000379:methods; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D044367:Phase Transition; D017640:Silicates / Q000737:chemistry*; D014961:X-Ray Diffraction
D017640:Silicates; D005063:Europium; D001729:Bismuth