Characterization of Eu-doped Y2O3 nanoparticles prepared in nonionic reverse microemulsions in relation to their application for field emission display

• Published in: Journal of the Electrochemical Society 2000-08, Vol.147 (8), p.3139-3142
• Main Authors: Lee, M H, Oh, S G, Yi, S C, Seo, D S, Hong, J P, Kim, C O, Yoo, Y K, Yoo, J S
• Format: Article
• Language: English
• Subjects: Cathodoluminescence, ionoluminescence; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electrodeposition, electroplating; Exact sciences and technology; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other luminescence and radiative recombination; Physics
• ISSN: 0013-4651; 1945-7111
• DOI: 10.1149/1.1393871

Y2O3:Eu luminescent particles were synthesised by the reaction between aqueous yttrium nitrate/europium nitrate salts and ammonium hydroxide solution by bulk precipitation and in a reverse microemulsion composed of NP-5/NP-9, cyclohexane, and water. Compared with the bulk precipitation method, the particles prepared in microemulsion showed a narrower size distribution, spherical shape, smaller size (20-30 nm), higher crystallinity, and stronger photoluminescence. Also, particles were deposited on a glass plate coated with indium tin oxide through the electrophoretic method. With these glass plates, low-voltage cathodoluminescence (CL) was measured. The nanoparticle synthesised in reverse microemulsion showed a stronger CL intensity and less current saturation than particles formed by bulk precipitation. These CL properties might be attributed to the smaller particle size, the larger luminescent surface area, and more well-developed crystalline structure of phosphor than those formed by bulk precipitation. 17 refs.