Effects of stress on the optical properties of epitaxial Nd-doped Sr0.5Ba0.5Nb2O6 films

Y. B. Yao; W. C. Liu; C. L. Mak; K. H. Wong

doi:10.1063/1.3647516

AIP Advances (Sep 2011)

Effects of stress on the optical properties of epitaxial Nd-doped Sr0.5Ba0.5Nb2O6 films

Y. B. Yao,
W. C. Liu,
C. L. Mak,
K. H. Wong

Affiliations

Y. B. Yao: Department of Applied Physics, The Hong Kong Polytechnic University, Hong Hum, Kowloon, Hong Kong SAR, China
W. C. Liu: Department of Applied Physics, The Hong Kong Polytechnic University, Hong Hum, Kowloon, Hong Kong SAR, China
C. L. Mak: Department of Applied Physics, The Hong Kong Polytechnic University, Hong Hum, Kowloon, Hong Kong SAR, China
K. H. Wong: Department of Applied Physics, The Hong Kong Polytechnic University, Hong Hum, Kowloon, Hong Kong SAR, China

DOI: https://doi.org/10.1063/1.3647516
Journal volume & issue: Vol. 1, no. 3
pp. 032172 – 032172-10

Abstract

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Nd-doped Sr0.5Ba0.5Nb2O6 (SBN) thin films with thicknesses ranging from 15 nm to 460 nm were grown on MgO (100) substrates using pulsed laser deposition technique. X-ray diffraction studies showed that the films were highly (001)-oriented and epitaxially grown on the substrates. Raman spectroscopy revealed the presence of residual stresses in the films especially for those with thicknesses below 100 nm. Transmittance and photoluminescence spectra revealed that the band-gap energies as well as the light-induced emission bands were shifted to higher energies as the film thickness decreased. The Nd3+ emission lines in the films were also dependent on film thickness. Origins of these observations were discussed based upon the stress as well as grain size effects.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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