Artículo de revista
Synthesis and luminescent properties of two different Y2WO6:Eu3+ phosphor phases
Fecha
2015Registro en:
Journal of Alloys and Compounds 628 (2015) 352–356
0925-8388
10.1016/j.jallcom.2014.12.161
Autor
Llanos, Jaime
Olivares, Douglas
Manríquez Castro, Víctor
Espinoza, Darío
Brito, Iván
Institución
Resumen
In this paper, two different Y2 xEuxWO6 phases were synthesized. The monoclinic phase was prepared via
a conventional solid-state reaction, whereas the orthorhombic phase was obtained via a facile, low-temperature
combustion synthesis method. X-ray diffraction (XRD), scanning electron microscopy (SEM), differential
scanning calorimetry (DSC), and photoluminescence (PL) spectroscopy were used to
characterize the resulting phosphors. The XRD results indicate the orthorhombic phase crystallized isostructurally
with the Aurivillius Bi2WO6 phase, whereas the other polymorph crystallized isostructurally
with Yb2WO6 in the monoclinic system. The SEM studies revealed both phases had a strong tendency to
form agglomerates averaging nanometers in size. The photoluminescence emission spectra confirmed all
of the samples were efficiently excited by near UV light and were dominated by the electric dipole transition
5D0?7F2. The orthorhombic Y2 xEuxWO6 excitation spectrum possessed a broad band across the
entire UV region (220–400 nm); therefore, Y1.86Eu0.14WO6 could be considered an efficient spectral converter
material for use in dye-sensitized solar cells.