Optimal composition of europium gallium oxide thin films for device applications
Abstract
Europium gallium oxide (EuxGa1-x)(2)O-3 thin films were deposited on sapphire substrates
by pulsed laser deposition with varying Eu content from x=2.4 to 20 mol %. The optical
and physical effects of high europium concentration on these thin films were studied
using photoluminescence (PL) spectroscopy, x-ray diffraction (XRD), and Rutherford
backscattering spectrometry. PL spectra demonstrate that emission due to the D-5(0)
to F-7(J) transitions in Eu3+ grows linearly with Eu content up to 10 mol %. Time-resolved
PL indicates decay parameters remain similar for films with up to 10 mol % Eu. At
20 mol %, however, PL intensity decreases substantially and PL decay accelerates,
indicative of parasitic energy transfer processes. XRD shows films to be polycrystalline
and beta-phase for low Eu compositions. Increasing Eu content beyond 5 mol % does
not continue to modify the film structure and thus, changes in PL spectra and decay
cannot be attributed to structural changes in the host. These data indicate the optimal
doping for optoelectronic devices based on (EuxGa1-x)(2)O-3 thin films is between
5 and 10 mol %. (C) 2010 American Institute of Physics. [doi:10.1063/1.3319670]
Type
Journal articlePermalink
https://hdl.handle.net/10161/3324Published Version (Please cite this version)
10.1063/1.3319670Citation
Wellenius,P.;Smith,E. R.;LeBoeuf,S. M.;Everitt,H. O.;Muth,J. F.. 2010. Optimal composition
of europium gallium oxide thin films for device applications. Journal of Applied Physics
107(10): 103111-103111.
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Show full item recordScholars@Duke
Henry Everitt
Adjunct Professor of Physics
Dr. Everitt is one of the Army's chief scientists. He works at the Army's Aviation
and Missile RD&E Center at Redstone Arsenal, AL. Through his adjunct appointment in
the Duke Physics Department, he leads an active experimental research group in condensed
matter physics, nanophotonics, molecular physics, and novel terahertz imaging with
colleagues on campus and through an international network of collaborators. Four
principal research areas are being pursued:
1) Ultrafast Spectroscopy.

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