Investigation of luminescence spectra of the Y$_3$Al$_5$O$_{12}$ and Y$_3$Al$_5$O$_{12}$:Ce single-crystal films

The luminescence spectra of single-crystal films and bulk crystals of yttrium-aluminum garnet Y$_3$Al$_5$O$_{12}$ and Ce$^{3+}$-activated Y$_3$Al$_5$O$_{12}$ were investigated. It was shown that the room-temperature luminescence intensity of theCe$^{3+}$-free single-crystal Y$_3$Al$_5$O$_{12}$ film was considerably lower than that of the bulk crystals, while the luminescence intensity of the Ce$^{3+}$ ions in the Y$_3$Al$_5$O$_{12}$:Ce films was considerably higher than that one for the corresponding bulk crystal.