Investigación

 

Properties of Er₂O₃ nanoparticles synthesized by a modified co-precipitation method

 

J. Castañeda-Contreras^a*, V.F. Marañón-Ruiz^a, M.A. Meneses-Nava^b, H. Pérez- Ladrón de Guevara^a, R.A. Rodríguez Rojas^a, R. Chiu-Zárate^a

 

^a Universidad de Guadalajara, Centro Universitario de los Lagos, Av. Enrique Díaz de Leon, S/N. Lagos de Moreno, Jalisco. 47460, México. * Tel/fax: +52 1 474 742 3678. e-mail: jcc050769@yahoo.com.mx.

^b Centro de Investigaciones en Óptica, A.C. Apartado Postal 1-948, León, Gto. México.

 

Received 28 October 2014;
accepted 19 January 2014

 

Abstract

Er₂ O₃ nanoparticles were synthesized by co-precipitation with the addition of ascorbate as stabilizing agent. The nanoparticles had spherical shapes with a mean diameter of 32 nm and were allocated in clusters, as determined by XRD, AFM, and optical microscopy. Characteristic green and red emissions from Er³+ were recorded by pumping the nanoparticles at 525 nm, 805 nm, and 975 nm. However, the luminescence spectra show an enhancement of red emission for NIR pump wavelengths. We proposed this behavior was due to phonon-assisted depopulation mechanisms and energy transfer processes related to the different excitation schemes.

Keywords: Erbium nanoparticles; optical materials and properties; spectroscopy.

 

PACS: 78.60.Lc; 78.67.Bf

 

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