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Optical and adhesive properties of composite silica-impregnated Ca-α-SiAlON:Eu2+ phosphor films prepared on silica glass substrates
Authors:Takuya Kitabatake  Tetsuo Uchikoshi  Fumio Munakata  Yoshio Sakka  Naoto Hirosaki
Affiliation:1. Department of Energy Science and Nuclear Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan;2. Nano Ceramics Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;1. University of Belgrade – Vin?a Institute of Nuclear Sciences, P.O. Box 522, 11001 Belgrade, Serbia;2. Dipartimento di Biotecnologie, Università di Verona and INSTM, UdR Verona, Strada Le Grazie 15, I-37134 Verona, Italy;3. Institute of Physics, University of Tartu, Riia 142, Tartu 51014, Estonia;4. LSME&CIME, École Polytechnique Fédérale de Lausanne, Station 12, CH-1015 Lausanne, Switzerland;1. Tohoku University, Institute for Material Research, 2-1-1 Katahira Aoba-ku, Sendai, Miyagi 980-8577, Japan;2. Tohoku University, New Industry Creation Hatchery Center, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;3. C&A Corporation, T-Biz, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;4. Institute of Physics AS CR, Cukrovarnicka 10, 16253 Prague, Czech Republic;5. Prokhorov General Physics Institute, Russian Academy of Sciences, 38 Vavilov Str., 119991 Moscow, Russia;1. Univ Lyon, CNRS, INSA-Lyon, Université Claude Bernard Lyon 1, CETHIL UMR5008, F-69621 Villeurbanne, France;2. Université de Lyon, CNRS, UMR 5516, Laboratoire Hubert-Curien, Saint-Étienne, France;3. HEF R&D, ZI Sud, 42166 Andrezieux-Boutheon Cedex, France;1. Delft University of Technology, Faculty of Applied Sciences, Department of Radiation Science and Technology, Section Luminescence Materials, Mekelweg 15, 2629 JB, Delft, Netherlands;2. Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012, Bern, Switzerland
Abstract:The compaction of a Eu-doped Ca-α-SiAlON phosphor powder was performed by electrophoretic deposition (EPD). The effect on the adhesion and optical properties of the silica precursor as both a binder of the powder and a filler of the air voids were evaluated. The adhesion of the silica impregnated composite film to the silica glass substrate was characterized by the tape test. The improvement of the external quantum efficiency was confirmed from the PL spectra measurement after the silica impregnation. The temperature dependence of the external quantum efficiency was also investigated in order to discuss the advantage of using the silica precursor as a binder for high-brightness LED applications.
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