Relationship between structure and luminescent properties of epitaxial grown Y{sub}2O{sub}3:Eu thin films on LaAlO{sub}3 substrates

摘要

Cathodoijiminescence images of individual pores have been obtained at nanometer resolution in europium-activated yttrium oxide (Y{sub}2o{sub}3:Eu) (001) thin films, epitaxially grown on LaAlO{sub}3 (001) substrates. Comparison with Z-contrast images, obtained simultaneously, directly show the "dead layer" to be about 5 nm thick. This "dead layer" is the origin of the reduced emission efficiency with increasing pore size. Pore sizes were varied by using different substrate temperatures and laser pulse repetition rates during film growth. These films are epitaxially aligned with the substrate, which is always Al terminated.