Single-step deposition of Eu-doped Y 2 O 3 phosphor coatings through a precursor plasma spraying technique
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John B. Parise Center for Thermal Spray Research, Department of Materials Science and Engineering, Department of Chemistry, and Department of Geosciences, State University of New York at Stony Brook, Stony Brook, New York 11794-2275
Clare P. Grey Center for Thermal Spray Research, Department of Materials Science and Engineering, and Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-2275
Sanjay Sampatha) and Herbert Herman Center for Thermal Spray Research, Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794-2275
Harry D. Gafney Department of Chemistry and Biochemistry, City University of New York, Queens College, Flushing, New York 11367 (Received 1 June 2002; accepted 26 August 2002)
Europium-doped yttrium oxide (Y2O3:Eu3+) luminescent coatings were produced in a single step directly from a solution precursor using a radio frequency induction plasma spray technique. Crystalline and luminescent coatings were grown on Si(100) and steel substrates by this process. X-ray diffraction analyses on these coatings confirmed that polycrystalline cubic Y2O3 phase formed in situ with no impurity phases. The observed photoluminescence from these coatings is in all probability due to the highly crystalline nature of the coating combined with submicron spherical morphology of the grains.
Interest in the growth and development of rare-earthactivated oxide phosphor thin coatings and powders for advanced display applications, such as plasma displays, field-emission displays, and electroluminescent displays, as well as for thermographic phosphors for the development of sensors has increased significantly during the past decade.1,2 The extraordinary chemical stability, luminescent efficiency, and environmental safety makes rare-earth-activated oxide phosphors, especially Euactivated Y2O3, the most promising oxide-based red phosphor known so far. Luminescent properties of the Y2O3:Eu3+ system have been mainly studied in single crystals and powders. Thin coatings of Y2O3:Eu3+ have been produced by metalorganic chemical vapor deposition, pulsed-laser ablation, sputtering, and sol-gel processes.2–11 Irrespective of the
a) b)
Address all correspondence to these authors. Current address: Central Glass and Ceramic Research Institute, Kolkata 700 032, India. J. Mater. Res., Vol. 17, No. 11, Nov 2002
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deposition technique, the coatings were usually poorly crystalline in nature. Phosphor materials of high purity and compositional homogeneity, combined with semimicron-sized and crystalline particles, are the key factors for producing new flat panel display devices. Thin coatings offer several advantages over traditional discrete powder screens, such as reduced light scattering, less material waste, better thermal stability, and superior adhesion to a solid surface. Additionally, they also offer high contrast, as well as a higher degree of uniformity and crystallinity
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