Issue 46, 2014

Down- and up-converting dual-mode YPO4:Yb3+,Tb3+ nanocrystals: synthesis and spectroscopic properties

Abstract

Tetragonal YPO4 nanocrystals doped with Yb3+ and Tb3+ ions were synthesized by 900 °C annealing of precursors obtained with a co-precipitation method in the presence of glycerine. These materials exhibited intense green luminescence under ultraviolet excitation and up-conversion emission from the 5D3 and 5D4 Tb3+ excited states after irradiation with near infrared light (λ = 980 nm). The structure and morphology of the products were analysed by recording X-ray diffraction patterns and transmission electron microscopy images. The obtained nanomaterials were single-phased with spherical shaped nanocrystals that had an average size of 18 ± 3 nm. The spectroscopic properties of YPO4:Yb3+,Tb3+ nanocrystals were investigated based on their excitation and emission spectra. The time-resolved luminescence traces were measured, and the luminescence lifetimes of Tb3+ and Yb3+ ions were calculated. The most effective dopant concentrations were determined to be 5% Yb3+ and 15% Tb3+, which exhibited the most intense ultraviolet excited emission and up-conversion. Because the integral intensity was observed to be dependent on the power of the pumping laser, a cooperative energy transfer (CET) mechanism underlying the observed up-conversion was proposed.

Graphical abstract: Down- and up-converting dual-mode YPO4:Yb3+,Tb3+ nanocrystals: synthesis and spectroscopic properties

Supplementary files

Article information

Article type
Paper
Submitted
23 Jul 2014
Accepted
12 Sep 2014
First published
15 Sep 2014
This article is Open Access
Creative Commons BY license

Dalton Trans., 2014,43, 17255-17264

Author version available

Down- and up-converting dual-mode YPO4:Yb3+,Tb3+ nanocrystals: synthesis and spectroscopic properties

T. Grzyb, R. J. Wiglusz, A. Gruszeczka and S. Lis, Dalton Trans., 2014, 43, 17255 DOI: 10.1039/C4DT02234C

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