Novel Blue-Emitting NaxCa1-xAl2-xSi2+xO8:Eu2+ (x=0.34) Phosphor with High Luminescent Efficiency for UV-Pumped Light-Emitting Diodes

Cited 154 time in webofscience Cited 0 time in scopus
  • Hit : 570
  • Download : 0
A novel blue-emitting phosphor, Na0.34Ca0.66Al1.66Si2.34O8:Eu2+ (NCASO:Eu2+), was prepared by a wet chemical synthesis method based on the hydrolysis of tetraorthosiliate (TEOS) and confirmed the formation of NCASO:Eu2+ from Rietveld analysis. Photoluminescence (PL) results showed that the phosphor can be efficiently excited by UV light from 250 to 420 nm, and emitted bright broad blue emission, which has maximum intensity at around 445 nm. Under 365 nm excitation, the PL emission intensity area of optimized NCASO:Eu2+ was found to be 99.72% of that of a commercial BaMgAl10O17:Eu2+ (BAM:Eu2+) phosphor. Moreover, the optical absorbance, internal quantum efficiency, and external quantum efficiency of NCASO:Eu2+ were calculated to be 112%, 94%, and 105% of that of the commercial BAM:Eu2+ phosphor, respectively. The WLEDs were fabricated using the blue NCASO:Eu2+ phosphor, a green-emitting beta-SiAlON:Eu2+, and a red-emitting CaAlSiN3:Eu2+ phosphors with a near-UV chip. The WLED device exhibited an excellent color rendering index R-a of 94 at a correlated color temperature of 5956 K with CIE coordinates of x = 0.323, y = 0.335. These results suggest that NCASO:Eu2+ is a promising blue-emitting phosphor for UV LED applications.
Publisher
AMER CHEMICAL SOC
Issue Date
2012-10
Language
English
Article Type
Article
Keywords

PLAGIOCLASE FELDSPARS; ENERGY-TRANSFER; DIELECTRIC CHARACTERIZATION; QUANTUM EFFICIENCY; X-RAY; PHOTOLUMINESCENCE; TB3+

Citation

INORGANIC CHEMISTRY, v.51, no.20, pp.10688 - 10694

ISSN
0020-1669
DOI
10.1021/ic300956m
URI
http://hdl.handle.net/10203/104615
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 154 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0