Up-conversion luminescence of the NaRF4-NaR'F4 (R: Y, Yb, Er) core-shell nanomaterials

Iko Hyppänen; Jorma Hölsä; Jouko Kankare; Mika Lastusaari; Laura Pihlgren; Tero Soukka

doi:10.1007/s10895-010-0655-8

Up-conversion luminescence of the NaRF4-NaR'F4 (R: Y, Yb, Er) core-shell nanomaterials

J Fluoresc. 2011 May;21(3):963-9. doi: 10.1007/s10895-010-0655-8. Epub 2010 May 9.

Authors

Iko Hyppänen¹, Jorma Hölsä, Jouko Kankare, Mika Lastusaari, Laura Pihlgren, Tero Soukka

Affiliation

¹ Department of Chemistry, University of Turku, FI-20014 Turku, Finland.

PMID: 20455014
DOI: 10.1007/s10895-010-0655-8

Abstract

Up-converting NaRF(4)-NaR'F(4) (R: Y, Yb, Er) nanomaterials with different core-shell combinations were prepared with the co-precipitation method. The X-ray powder diffraction (XPD) measurements revealed the presence of both the cubic and hexagonal NaRF(4) phases. The crystallite sizes calculated with the Scherrer formula were 100 and 150 nm for the cubic and hexagonal phases, respectively. The FT-IR spectra showed water impurities. The up-conversion luminescence and luminescence decays were studied with NIR laser excitation at 970 nm. The up-conversion luminescence spectra showed strong red (640-685 nm) ((4)F(9/2) → (4)I(15/2)) and moderate green (515-560 nm) ((2)H(11/2,) (4)S(3/2) → (4)I(15/2)) Er(3+) luminescence. The strongest up-conversion luminescence and longest red luminescence decay was obtained from the Na(Y,Yb)F(4)-NaErF(4) core-shell combination.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Erbium / chemistry*
Infrared Rays*
Luminescence*
Molecular Structure
Nanostructures / chemistry*
X-Ray Diffraction
Ytterbium / chemistry*

Substances

Erbium
Ytterbium