Synthesis, structural and optical properties of Eu3+-doped ALnP2O7 (A = Cs, Rb, Tl; Ln = Y, Lu, Tm) pyrophosphates phosphors for solid-state lighting

A series of 2%Eu3(+)-activated ALnP(2)0(7) (A = Rb, Cs, TI; Ln = Y, Lu, Tm) pyrophosphates were synthesized via solid-state reaction method and characterized by X-ray diffraction (XRD), NMR and IR/Raman spectroscopy. Their photoluminescence properties were investigated at room temperature. The phosphors present red emitting luminescence under blue light excitation, based on f-f transitions of Eu3+ ions. Emission spectra showed that the samples had intense and prevailing red emissions at 610 nm belonging to the D-5(0)-> F-7(2) electric dipole transition. One Eu3+ center was assigned according to the crystal structure and the luminescence characteristics. The decay times were measured monitoring the maximum of emission at),em = 610 nm and exciting in the D-5(2) band (lambda(exc) = 464 nm). All decay curves were single exponential and lifetimes remain constant with value in integral range 3-4 ms, according to the alkali metal ion. The optical properties show that these host materials are suitable for phosphor materials for solid-state lighting applications. (C) 2017 Elsevier B.V. All rights reserved.