Formation of a Cr3+-rich luminescent thin phase along a grain boundary of α-Al2O3

Abstract

An α-Al2O3 bicrystal doped with Cr3+ was fabricated by diffusion bonding at high temperatures. It was found that a ruby phase with approximately 200nm thickness was formed along the grain boundary. This thin phase shows Cr3+:Al2O 3-induced luminescence, confirmed by confocal micro-luminescence spectroscopy. © 2011 The Ceramic Society of Japan.