Comparison of the luminescent properties of LuAG:Pr nanopowders, crystals and films using synchrotron radiation

Comparison of the luminescent properties of nanopowder, single crystal and single crystalline film of Pr$³⁺$ doped Pr-doped Lu$_3$Al$_5$O$₁₂$ garnet (LuAG:Pr) prepared by the different technological methods is performed in this work using the time-resolved emission spectroscopy under excitation by synchrotron radiation with an energy of 3.7–25 eV at 300 K and 10 K. The notable differences in the properties of the Pr$³⁺$ luminescence are observed in LuAG:Pr crystals and films caused by involving the Lu$_Al$ antisite defects and oxygen vacancies in crystals and Pb$²⁺$ flux related dopant in films in the excitation processes of the Pr$³⁺$ luminescence. At the same time, we have also found that the influence of host defects on the Pr$³⁺$ luminescence is significantly smaller in the LuAG:Pr nanopowders.