Near UV-pumped yellow-emitting Eu2+-doped Na3K(Si1-xAlx)(8)O-16 +/-delta phosphor for white-emitting LEDs

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A novel yellow-emitting phosphor, Na3K(Si1-xAlx)(8)O-16 +/-delta:Eu2+, peaking at 555 nm was synthesized and evaluated as a candidate for white-emitting LEDs. The structure refinement, luminescence properties of Na3K(Si1-xAlx)(8)O-16 +/-delta:Eu2+ phosphors as well as their thermal quenching and the fabrication of white-emitting LEDs were for the first time investigated. By partially substituting Si4+ with Al3+, the emission peak was shifted from 553 nm to 573 nm, giving a greenish yellow-yellow color, due to the splitting of the 5d energy level of Eu2+. By using a near-UV LED (395 nm) and a mixture of yellow-emitting (NaK)-K-3(Si1-xAlx)(8)O-16 +/-delta:Eu2+ phosphor and blue-emitting BaMgAl10O17:Eu2+ phosphor as light converters, we constructed an intense white-light-emitting LED. The white-light-emitting LED exhibited an excellent color-rendering index R-a of 90 at a correlated color temperature of 5952 K with CIE coordinates of (0.33, 0.29). The results of the white-emitting LED package combining 395 nm near UV chip with Y/B phosphors demonstrated the potential of the yellow-emitting Na3K(Si1-xAlx)(8)O-16 +/-delta:Eu2+ phosphor for UV LED application.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2012
Language
English
Article Type
Article
Keywords

LUMINESCENCE PROPERTIES; DIODE; EMISSION; CE3+

Citation

JOURNAL OF MATERIALS CHEMISTRY, v.22, no.18, pp.8793 - 8798

ISSN
0959-9428
DOI
10.1039/c2jm16739e
URI
http://hdl.handle.net/10203/101290
Appears in Collection
MS-Journal Papers(저널논문)
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