Substitution of oxygen by fluorine in the GdSr2AlO5:Ce3+ phosphors: Gd1-xSr2+xAlO5-xFx solid solutions for solid state white lighting.
Solid solutions between two isotypic host compounds: GdSr(2)AlO(5) and Sr(3)AlO(4)F; Gd(1-x)Sr(2+x)AlO(5-x)F(x):Ce(3+) (GSAF:Ce(3+)), have been prepared across the complete solid solution range x. Depending on x, the series display considerable optical tunability of emission wavelengths in the range 574 nm to 474 nm, which is attributed to the decreased crystal field splitting arising from increased host ionicity with fluorine addition. Applying the GSAF:Ce(3+) phosphors on InGaN LEDs (lambda (max) = 405 nm and 450 nm) permits white lighting sources to be prepared. The characteristics of these are reported.
Im
Won Bin
WB
Solid State Lighting and Energy Center, Materials Department, University of California, Santa Barbara, CA 93106, USA. imwonbin@mrl.ucsb.edu
Fourré
Yoann
Y
Brinkley
Stuart
S
Sonoda
Junichi
J
Nakamura
Shuji
S
DenBaars
Steven P
SP
Seshadri
Ram
R
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005461:Fluorine / Q000737:chemistry*; D008029:Lighting / Q000295:instrumentation*; D010100:Oxygen / Q000737:chemistry*; D012666:Semiconductors
D005461:Fluorine; D010100:Oxygen