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Luminescent properties and the energy transfer from host to Ce 3+ ions are analyzed in single crystalline films (SCF) of YAlO 3 :Ce (YAP:Ce), Y 1−x Lu x AP:Ce (YLuAP:Ce) and LuAlO 3 :Ce (LuAP:Ce) perovskites in comparison with their single crystal (SC) analogues using the timeresolved luminescence spectroscopy under synchrotron radiation excitation. It is shown that the main peculiarity of luminescent properties of YAP:Ce, YLuAP:Ce and LuAG:Ce SCF is determined by the extremely low concentration of Y Al and Lu Al antisite defects and vacancy-type defects in SCF as compared to SC. The advantages of phosphors based on (Y-Lu)AP:Ce SCF are due to the absence of emission and trapping centers in these SCF which are connected with the above mentioned bulk crystal defects.

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