Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5398968 | Journal of Luminescence | 2015 | 5 Pages |
Abstract
A single-phase Sr5-x-yBay(PO4)3Cl:xEu2+ blue phosphors were synthesized through a solid-state reaction. By increasing Ba2+/Sr2+ ratio, their emission spectra are redshifted (449Â nmâ460Â nm in main peak) and broadened (34â90Â nm in half width). Their excitation spectra are in the near ultraviolet region ascribed to be the allowed transition of Eu2+ from the 4f ground state to the 5d excited state. The phosphors show a similar thermal stability with Y3Al5O12:Ce3+ commercial phosphor. A white-light-emitting diode was fabricated using 400Â nm chip with blue Sr2.45Ba2.45(PO4)3Cl:0.1Eu2+ and orange Sr3SiO5:Eu2+ phosphors. The white-light-emitting diode shows the color coordinates (0.3118, 0.3039) at a white light (correlated color temperature=6810Â K) and excellent color rendering index of 86. These results suggest that Sr2.45Ba2.45(PO4)3Cl: 0.1Eu2+ is a promising blue phosphor for high color-rendering ultraviolet-based white-light-emitting diode.
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Authors
G. Deressa, K.W. Park, H.S. Jeong, S.G. Lim, H.J. Kim, Y.S. Jeong, J.S. Kim,