Journal
JOURNAL OF LUMINESCENCE
Volume 131, Issue 7, Pages 1346-1349Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2011.02.034
Keywords
Phosphors; Na2CaPO4F:Eu2+; Light-emitting diodes
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Funding
- National Science Council of Taiwan [NSC98-2113-M-009-005-MY3]
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In this study, green-emitting Na2CaPO4F:Eu2+ phosphors were synthesized by solid-state reactions. The excitation spectra of the phosphors showed a broad hump between 250 and 450 nm; the spectra match well with the near-ultraviolet (NUV) emission spectra of light-emitting diodes (LEDs). The emission spectrum showed an intense broad emission band centered at 506 nm. White LEDs were fabricated by integrating a 390 nm NUV chip comprising blue-emitting BaMgAl10O17:Eu2+, green-emitting Na2CaPO4F:0.02 Eu2+, and red-emitting CaAlSiN3:Eu2+ phosphors into a single package; the white LEDs exhibited white light with a correlated color temperature of 5540 K. a color-rendering index of 90.75, and color coordinates (0.332, 0.365) close to those of ideal white light. (C) 2011 Elsevier B.V. All rights reserved.
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