Morphology- and size-dependent spectroscopic properties of Eu3 -doped Gd2O3 colloidal nanocrystalsReport as inadecuate




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Journal of Nanoparticle Research

, 16:2690

First Online: 18 October 2014Received: 02 July 2014Accepted: 03 October 2014

Abstract

The synthesis, morphological characterization, and optical properties of colloidal, EuIII doped Gd2O3 nanoparticles with different sizes and shapes are presented. Utilizing wet chemical techniques and various synthesis routes, we were able to obtain spherical, nanodisk, nanotripod, and nanotriangle-like morphology of Gd2O3:Eu nanoparticles. Various concentrations of Eu ions in the crystal matrix of the nanoparticles were tested in order to establish the levels at which the concentration quenching effect is negligible. Based on the luminescence spectra, luminescence lifetimes and optical parameters, which were calculated using the simplified Judd–Ofelt theory, correlations between the Gd2O3 nanoparticles morphology and Eu ions luminescence were established, and allowed to predict the theoretical maximum quantum efficiency to reach from 61 to 98 %. We have also discussed the impact of the crystal structure of Gd2O3 nanoparticles, as well as coordinating environment of luminescent ions located at the surface, on the emission spectra. With the use of a tunable femtosecond laser system and the Z-scan measurement technique, the values of the effective two-photon absorption cross-section in the wavelength range from 550 to 1,200 nm were also calculated. The nonlinear optical measurements revealed maximum multi-photon absorption in the wavelength range from 600 to 750 nm.

KeywordsOxide nanoparticles Lanthanide luminescence Judd–Ofelt theory Z-scan technique Nonlinear optics Colloidal stability  Download fulltext PDF



Author: Dominika Wawrzynczyk - Marcin Nyk - Artur Bednarkiewicz - Wiesław Strek - Marek Samoc

Source: https://link.springer.com/



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