期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 35, 页码 18204-18213出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm33620k
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资金
- ConvEne IGERT Program [NSF-DGE 0801627]
- MRSEC Program of the NSF [DMR 1121053]
- UCSB Center for Scientific Computing [NSF DMR-1121053, NSF CNS-0960316]
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U. S. Department of Energy
- Direct For Computer & Info Scie & Enginr [960316] Funding Source: National Science Foundation
- Division Of Computer and Network Systems [960316] Funding Source: National Science Foundation
A near-UV excited, oxyfluoride phosphor solid solution Sr1.975Ce0.025Ba(AlO4F)(1-x)(SiO5)(x) has been developed for solid state white lighting applications. An examination of the host lattice, and the local structure around the Ce3+ activator ions through a combination of density functional theory, synchrotron X-ray and neutron powder diffraction and total scattering, and electron paramagnetic resonance, points to how chemical substitutions play a crucial role in tuning the optical properties of the phosphor. The maximum emission wavelength can be tuned from green (lambda(em) = 523 nm) to yellow (lambda(em) 552 nm) by tuning the composition, x. Photoluminescent quantum yield is determined to be 70 perpendicular to 5% for some of the examples in the series. Excellent thermal properties were found for the x = 0.5 sample, with the photoluminescence intensity at 160 degrees C only decreased to 82% of its room temperature value. Phosphor-converted LED devices fabricated using an InGaN LED (lambda(max) - 400 nm) exhibit high color rendering white light with R-a = 70 and a correlated color temperature near 7000 K. The value of R-a could be raised to 90 by the addition of a red component, and the correlated color temperature lowered to near 4000 K.
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