Abstract
M-Al2O4:Eu2+ (M: Ca, Sr) thin films were deposited on c-plane sapphire substrates by rf magnetron sputtering, and growing behaviors and luminescent properties were investigated. As-deposited films were amorphous-like, but they were transformed to the epitaxial films by annealing at high temperatures. The epitaxial orientations and growing behaviors of CaAl2O4 and SrAl2O4 films were different each other due to the crystallographic distinction. PL spectra exhibited a blue and a green emission for CaAl2O4:Eu2+ and SrAl2O4:Eu2+, respectively.
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