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Title: Ultraviolet and blue cathodoluminescence from cubic Y2O3 and Y2O3: Eu3+ generated in a transmission electron microscope
Authors: den Engelsen, D
Fern, GR
Ireland, TG
Harris, PG
Hobson, PR
Lipman, A
Dhillon, R
Marsh, PJ
Silver, J
Keywords: transmission electron microscope;Transmission electron microscope
Issue Date: 8-Jul-2016
Publisher: Royal Society of Chemistry
Citation: den Engelsen, D., Fern, G.R., Ireland, T.G., Harris, P.G., Hobson, P.R., Lipman, A., Dhillon, R., Marsh, P.J. and Silver, J. (2016) 'Ultraviolet and blue cathodoluminescence from cubic Y2O3 and Y2O3: Eu3+ generated in a transmission electron microscope', Journal of Materials Chemistry C, 4(29), pp. 7026 - 7034. doi: 10.1039/c6tc01750a.
Abstract: Copyright © The Author(s) 2016. Herein we describe the investigation of transmission electron microscopeof non-doped Y2O3 and Y2O3 doped with Eu3+ in a transmission electron microscope (TEM) equipped with a spectrometer to detect cathodoluminescence from individual particles. Each submicron particle was made up of nanometre sized crystals. We found that these crystals showed a broad emission band at 353 nm upon bombardment with 200 keV or 80 keV electrons. Upon increasing the Eu3+ concentration from 0 to 2 mol% this UV/blue emission was gradually quenched: at Eu3+ concentrations >2 mol% no UV/blue emission was detected, only the well-known cathodoluminescence (CL) spectrum of Y2O3:Eu3+ could be recorded. This UV/blue emission has been attributed to the intrinsic luminescence of Y2O3 caused by self-trapped excitons. We found that the UV/blue luminescence was strongly temperature dependent and that the trap depth of the self-trapped excitons was 0.14 eV. The ratios of the spectral radiances of 5D1 → 7FJ and 5D0 → 7FJ (J = 0, 1...6) Eu3+ transitions in the CL-TEM spectra of Y2O3:Eu3+ at low Eu3+ concentrations was about a factor of 10 larger than those recorded at 15 keV. This phenomenon has been explained by absorption of the intrinsic luminescence of Y2O3 by Eu3+.
ISSN: 2050-7526
Appears in Collections:Wolfson Centre for Sustainable Materials Development and Processing
Dept of Electronic and Electrical Engineering Research Papers

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