title: Substitution of oxygen by fluorine in the GdSr2AlO5:Ce3+ phosphors: Gd1-xSr2+xAlO5-xFx solid solutions for solid state white lighting.
abstract: 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.
authors.affiliation: Solid State Lighting and Energy Center, Materials Department, University of California, Santa Barbara, CA 93106, USA. imwonbin@mrl.ucsb.edu
authors.forename: Won Bin
authors.initials: WB
authors.lastname: Im
authors.forename: Yoann
authors.initials: Y
authors.lastname: Fourré
authors.forename: Stuart
authors.initials: S
authors.lastname: Brinkley
authors.forename: Junichi
authors.initials: J
authors.lastname: Sonoda
authors.forename: Shuji
authors.initials: S
authors.lastname: Nakamura
authors.forename: Steven P
authors.initials: SP
authors.lastname: DenBaars
authors.forename: Ram
authors.initials: R
authors.lastname: Seshadri
mesh_terms: 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
chemical_list: D005461:Fluorine; D010100:Oxygen