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

Abstract

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 4f15d1→4f2 transitions (UV bands in region of 250-320 nm), intraconfigurational 4f2→4f2 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 4f15d1→4f2 radiative transitions. Luminescence decay kinetics measurements established decay time τ≈19 ns at room temperature. The study of thermally stimulated luminescence demonstrates effective light storage. Parameters of charge carriers' traps were calculated: ΔE1 = 1.1 eV (for peak at 352 K) and ΔE2 = 1.3 eV (for peak at 388 K). © 2020 American Institute of Physics Inc. All rights reserved. ; The work was partially supported by the Ministry of Education and Science of The Russian Federation (through the basic part of the government mandate), Act 211 Government of the Russian Federation (contract N? 02.A03.21.0006). The time-resolved X-ray excited measurements were performed at the Shared research center SSTRC based on the NovoFEL/VEPP-4 - VEPP-2000 facilities at Budker Institute of Nuclear Physics (Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia) while using experimental equipment funded by RFMEFI62119X0022 project. Authors thank Prof. Marco Bettinelli (University of Verona, Italy) for providing research samples, Dr. Sergey Omelkov (University of Tartu, Estonia) for assistant in PCL measurements and Dr. Konstantin Ivanovskikh (UrFU, Yekaterinburg, Russia) for fruitful discussions.