Effect of Strontium concentration on the luminescent properties of (Ba1-xSrx)2SiO4:Eu2+ prepared by pressure-assisted combustion-synthesis


C.R. García

Abstract— In this work, the effect of Sr doping concentration on the morphological and luminescence properties of Ba2SiO4:Eu2+ phosphors was studied. Green-yellow emitting phosphors (Ba1-xSrx)2SiO4 activated with Eu2+ ions were fabricated by pressure-assisted combustion synthesis (PACS) at an initial pressure of 3.4 MPa. The Sr (x) atomic concentration was changed from 0.0 to 0.5 at.%. The X-ray diffraction (XRD) analysis showed that these phosphors have a single phase corresponding to the Ba2SiO4 orthorhombic phase. Different morphologies with sizes in the range of 1-12.12 μm were observed according to the Sr content, such as spheres-like (x=0.0 at.%), irregular-shaped (x=0.2 at.%) and rectangular flakes-like particles (x=0.5 at.%).The main emission bands were located in the range of 507 to 522 nm, which correspond to 4f-5d allowed electric-dipole transition of Eu²+ and the main excitation band was located at 397 nm. The phosphor with flakes-like morphology (x=0.5 at.% of Sr) exhibited the highest luminescent intensity and its CIE coordinates are (0.31, 0.60) which color is located in the green region. The strong green-yellow emission observed in our phosphors suggests that they can be useful for the green component in RGB white LEDs.

Artículo-CEGR 4 2016