title: Highly spectral dependent enhancement of upconversion emission with sputtered gold island films.
abstract: We report a five-fold overall enhancement of upconversion emission in NaYF(4) : Yb/Er nanocrystals when coupled with gold island films. Spectroscopic studies show that the enhancement factors are highly dependent on the exact spectral positions and excitation power density, with a largest enhancement factor of more than 12 observed at selected spectral positions, which may be attributed to different upconversion processes involved.
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Di
authors.initials: D
authors.lastname: Xu
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Duan
mesh_terms: D003460:Crystallization / Q000379:methods; D004871:Erbium / Q000737:chemistry*; D005453:Fluorescence; D005459:Fluorides / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D013053:Spectrophotometry; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: C525362:sodium yttriumtetrafluoride; D015019:Yttrium; D006046:Gold; D004871:Erbium; D015018:Ytterbium; D005459:Fluorides