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Title: Cathodoluminescence of Double Layers of Phosphor Particles
Authors: den Engelsen, D
Harris, P
Ireland, T
Silver, J
Keywords: Science & Technology;Technology;Physical Sciences;Materials Science, Multidisciplinary;Physics, Applied;Materials Science;Physics
Issue Date: 2014
Publisher: Electrochemical Society
Citation: ECS Journal of Solid State Science and Technology, 2014, 3 (4), pp. R53 - R59
Abstract: We present radiance measurements of particle layers of ZnO:Zn, Y2O3:Eu and Y2O2S:Eu bombarded with electrons at anode voltages between 1 and 15 kV. The layers described in this work refer to single component layers, double layers and two component mixtures. The phosphor layers are deposited on ITO-coated glass slides by settling; the efficiency of the cathodoluminescence is determined by summing the radiances and luminances in the reflected and transmitted modes respectively. The efficiency of a double layer of Y2O3:Eu on top of ZnO:Zn at high electron energy is significantly larger than the efficiency of a corresponding layer in which the two components are mixed. This result is interpreted in terms of the penetration-model, which predicts a larger efficiency for a high-voltage phosphor on top of a low-voltage phosphor. When a layer of the low-voltage phosphor ZnO:Zn is on top of the high-voltage phosphor Y2O3:Eu, we also observe a higher efficiency than that of the corresponding layer with both components mixed. In this case the efficiency increases due to suppression of charging in the Y2O3:Eu layer. Double layers of ZnO:Zn and Y2O2S:Eu did not show enhanced efficiency, because the size of the Y2O2S:Eu particles was too large to evoke the penetration effect. © The Author(s) 2014. Published by ECS.
Description: This article has been made available through the Brunel Open Access Publishing Fund.
ISSN: 2162-8777
Appears in Collections:Brunel OA Publishing Fund
Dept of Mechanical and Aerospace Engineering Research Papers

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