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Luminescence of Lu2O3:Tm3+ nanoparticles

Published online by Cambridge University Press:  21 March 2011

Celso de Mello Donegá ,
Eugeniusz Zych  and
Andries Meijerink
Celso de Mello Donegá
Affiliation:
Debye Institute, Dept. of Physics and Chemistry of Condensed Matter, Utrecht University, Princetonplein 1, 3508 TA Utrecht, The Netherlands On leave of absence from Dept. of Fundamental Chemistry, UFPE, Recife-PE, Brazil
Eugeniusz Zych
Affiliation:
Faculty of Chemistry, Wroclaw University, 14 Joliot-Curie Street, 50-383 Wroclaw, Poland
Andries Meijerink
Affiliation:
Debye Institute, Dept. of Physics and Chemistry of Condensed Matter, Utrecht University, Princetonplein 1, 3508 TA Utrecht, The Netherlands
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Abstract

This paper presents for the first time a comparison between the luminescence properties (viz. emission and excitation spectra, lifetimes, and concentration quenching) of nanocrystalline and microcrystalline Lu2O3:xTm3+ (x= 0.1– 5 mol%). The results show that the most important difference between the two size regimes is the higher defect concentration in the nanoparticles. These defects give rise to a broadband emission (λmax = 430 nm), and to partial quenching of the Tm3+ emission, in addition to the expected concentration quenching by cross-relaxation between Tm3+ ions. The defect concentration seems to be similar in all nanocrystalline samples, so that those with the lowest Tm3+ concentrations experience the most pronounced quenching. The nature of these defects is as yet unknown. The local structure around the Tm3+ ions is not noticeably different in the two size regimes. No evidence of phonon confinement or quantum size effects was observed in the Tm3+luminescence.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 667: Symposium G – Luminescence and Luminescent Materials , 2001 , G4.4
Copyright
Copyright © Materials Research Society 2001

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