One step urea assisted synthesis of polycrystalline Eu3+ doped KYP2O7 – luminescence and emission thermal quenching properties

Abstract

KYP₂O₇ powders doped with Eu³⁺ were obtained for the first time by a one-step urea-assisted combustion method. Detailed structural properties were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and X-ray fluorescence (EDX). Spectroscopic properties like excitation, emission and luminescence kinetics were investigated in the temperature range of 30–550 °C. The KYP₂O₇ doped with Eu³⁺ phosphor has a broad and intense absorption band centered at 213 nm, an absolute quantum yield of up to 62% and a luminescence quenching temperature of T_0.5 = 400 °C. The thermal behavior analysis of the luminescence shows that non-radiative internal losses are the main mechanism responsible for quenching of the luminescence.