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- W2047281086 abstract "The luminous efficiency of white light-emitting diodes, which are used as light sources for next-generation illumination, is continuously improving. Presently available white light-emitting diodes emit with extremely high luminance because their emission areas are much smaller than those of conventional light sources. Consequently, white light-emitting diodes produce a glare that is uncomfortable to the human eye. Here we report a yellow-emitting phosphor, the Eu2+-doped chlorometasilicate (Ca1-x-y,Srx,Euy)7(SiO3)6Cl2, which can be used to create glareless white light-emitting diodes. The (Ca1-x-y,Srx,Euy)7(SiO3)6Cl2 exhibits a large Stokes shift, efficiently converting violet excitation light to yellow luminescence, and phosphors based on this host material have much less blue absorption than other phosphors. We used crystal structure analysis to determine the origin of the desired luminescence, and we used (Ca1-x-y,Srx,Euy)7(SiO3)6Cl2 and a blue-emitting phosphor in combination with a violet chip to fabricate glareless white light-emitting diodes that have large emission areas and are suitable for general illumination. Light-emitting diodes are attractive sources of light used in an increasing range of applications. This study presents a novel europium-based phosphor that gives rise to a substantial reduction in the glare that often makes LEDs uncomfortable to the human eye." @default.
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- W2047281086 date "2012-10-16" @default.
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- W2047281086 title "A novel phosphor for glareless white light-emitting diodes" @default.
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- W2047281086 doi "https://doi.org/10.1038/ncomms2138" @default.
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