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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Henry Everitt
Adjunct Professor of Physics
Dr. Everitt is the Army's senior technologist (ST) for optical sciences, a senior
executive currently working for the Army Research Laboratory in Houston, TX. Through
his adjunct appointment in the Duke Physics Department, he leads an active experimental
research group in molecular physics, novel terahertz imaging, nanophotonics, and ultrafast
spectroscopy of wide bandage semiconductors with colleagues on campus and through
an international network of collaborators. Four principal research

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