Luminescence Study of KLuP2O7 Doped with Pr3+ Ions under Different Types of Excitation

This paper reports the spectroscopic properties of praseodymium-doped potassium lutetium double phosphates, KLuP2O7:Pr3+(1%). Spectra of photoluminescence (PL), PL excitation, X-ray excited luminescence and pulse cathodoluminescence, thermally stimulated luminescence were measured. KLuP2O7:Pr3+ showed Pr3+ emission connected both with high intensity interconfigurational 4f(1)5d(1)-> 4f(2) transitions (UV bands in region of 250-320 nm), intraconfigurational 4f(2)-> 4f(2) transitions (weak lines in vision spectral region) and Stocks defect-related luminescence. Upon both UV intra-center and band-to-band excitation with ionizing radiation, emission spectra of KLuP2O7:Pr3+ are dominated by Pr3+ interconfigurational 4f(1)5d(1)-> 4f(2) radiative transitions. Luminescence decay kinetics measurements established decay time tau approximate to 19 ns at room temperature. The study of thermally stimulated luminescence demonstrates effective light storage. Parameters of charge carriers traps were calculated: Delta E-1 = 1.1 eV (for peak at 352 K) and Delta E-2 = 1.3 eV (for peak at 388 K).