Crystal Research and Technology
Cryst. Res. Technol. 42, 1314 (2007) - Abstract -

Growth and characterization of Nd, Yb – yttrium oxide nanopowders obtained by sol-gel method

A. Rzepka, W. Ryba-Romanowski*, R. Diduszko, L. Lipińska, and A. Pajaczkowska

Institute of Electronic Materials Technology, ul. Wólczyńska133, 01-919 Warsaw, Poland
*Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wroclaw, Poland

Keywords Y2O3, nanopowders, sol-gel, luminescence
PACS 81.07.Wx, 81.20.Fw, 61.46.Df, 78.60.-b
DOI 10.1002/crat.200711024

Nanopowders of Y2O3 pure, doped and codoped by Nd3+, Yb3+ were obtained by sol-gel method. Solution with ethylene glycol was choosed as the proper solution where crystallites of powder with Nd and Yb dopants had the same size. Finally the one-phased compounds of Y2O3 doped 0.5 at% Nd and 1, 2 or 4 at% Yb were obtained. Grain growth and their morphology were investigated in various temperature and time of heating. The changes of crystallite sizes and lattice constants in relation to the heating time and temperature for the composition Y2O3 doped 0.5 at% Nd and 2 at% Yb are presented. Y2O3 containing 0,5 at% of Nd exhibits intense luminescence bands centered at 920 nm, 1100 nm and 1360 nm whereas a single band at about 1020 nm appears in samples co-doped with neodymium and ytterbium. Luminescence spectra recorded did not depend on the sample preparation procedure and size of grains. OH impurity affects critically the relaxation dynamics of luminescent ion in nanopowders.




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