Photo- and cathodoluminescence characteristics of blue-light-emitting epitaxial Sr[sub 2]CeO[sub 4] thin-film phosphors.

Orthorhombic epitaxial Sr[sub 2]CeO[sub 4] thin-film phosphors were grown on (100) SrTiO[sub 3] and yttria-stabilized-zirconia (YSZ) single crystal substrates with epitaxial relationships of (100) [010][sub Sr[sub 2]CeO[sub 4]]//(100)[010][sub SrTiO[sub 3]] and (100)[010][sub Sr[sub 2]CeO[sub 4]]//(100)[011][sub YSZ], respectively. As-deposited films exhibit a broadband photoluminescence (PL) emission, peaking at about 477-481 nm with a maximum cathodoluminescence (CL) intensity at about 465 nm. Enhanced PL intensity was observed for the films deposited on (100) YSZ and SrTiO[sub 3] substrates as compared to deposits on c-plane sapphire substrates, correlating with improved intragranular crystallinity and reducing defects via epitaxy. Postannealing in air significantly enhanced both of the PL and CL intensities. Luminous efficiency of 0.14 lm/W at 1 kV and 22 μA/cm[sup 2] was observed for a 2-μm-thick film annealed at 1000 °C in air. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]