Luminescence study in Eu-doped aluminum oxide phosphors

• Published in: Optical materials Vol. 27; no. 7; pp. 1311 - 1315
• Main Authors: Hirata, G., Perea, N., Tejeda, M., Gonzalez-Ortega, J.A., McKittrick, J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2005; Elsevier Science
• Subjects: Cathodoluminescence; Combustion synthesis; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Nanocrystals and nanoparticles; Optical materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of specific thin films; Optics; Photoluminescence; Physics; Cathodoluminescence; Combustion synthesis; Photoluminescence; Particle size; Powders; Doped materials; Binary compounds; Combustion; Experimental study; Microparticles; Nanoparticles; Europium additions; Phosphors; Alumina; Aluminium oxides
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2004.11.029

α- and γ-(Al1−xEux)2O3 polycrystalline phosphor powders have been prepared via pressure assisted combustion synthesis at ∼280°C. The particle size could be controlled (nanoparticles/microparticles) by adjusting the initial pressure in the combustion reactor. Upon excitation at 394nm, the Eu-doped alumina nanoparticles exhibited a strong photoluminescence due to a parity forbidden f–f intraconfigurational transition upon excitation at λ=395nm. By analyzing the emission lines in the cathodoluminescence spectrum of the europium doped α-Al2O3 sample it was inferred that the dopant ions occupy low symmetry sites in the host lattice. These powders are potentially good candidates for photonics applications.