A single-phase white light emitting Pr3+ doped Ba2CaWO6 phosphor: synthesis, photoluminescence and optical properties

• Published in: Optical materials 2018-04, Vol.78, p.52-62
• Main Authors: Sreeja, E., Vidyadharan, Viji, Jose, Saritha K., George, Anns, Joseph, Cyriac, Unnikrishnan, N.V., Biju, P.R.
• Format: Article
• Language: English
• Subjects: Optical properties; Oxides; Phosphors; Pr3
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2018.02.003

Pr3+ doped Ba2CaWO6 phosphor were prepared by traditional high-temperature solid-state reaction technique. The structure evolution was systematically investigated by X-ray diffraction (XRD), energy–dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis. The X-ray powder diffraction patterns indicate that the prepared phosphors crystallized in the cubic double-perovskite structure. The functional groups were identified using FTIR spectra and the elements present in the composition were confirmed by the EDS profile. The morphology of the phosphor was identified using SEM and TEM analysis. The PL spectra illustrated that these phosphors could be efficiently excited by charge transfer band of host and the maximum luminescence intensity was observed at 0.06 wt% of Pr3+ ion. Upon the charge transfer band excitation, emission spectra showed peaks at 489, 532, 647, 685 and 737 nm corresponding to 3P0→3H4, 3P1→3H5, 3P0→3F2, 3P0→3F3 and 3P0→3F4 transitions respectively. The concentration quenching of Ba2CaWO6:Pr3+ phosphor can be mainly attributed to dipole-dipole interaction. The CIE coordinates were estimated to be close to the white region. The decay curves are well fitted with double exponential decay models. The standard and modified Judd-Ofelt (JO) theories were used to determine the Judd-Ofelt intensity parameters, radiative transition probabilities and branching ratios. The optical properties indicate that Ba2CaWO6:Pr3+ phosphors can produce white light emission from a single phase host and its potential application for solid-state lighting and display devices. •Pr3+ doped BCW phosphor was synthesized by solid -state reaction method.•Standard and modified JO parameters and radiative properties were calculated.•Quantum efficiency, CCT and color purity were evaluated.•CIE coordinates of Pr3+: BCW phosphor lies in the near white light region.