Solution-combustion synthesis and photoluminescence properties of YBO_3:Tb~(3+) phosphor powders

摘要

YBO_3:Tb~(3+) nanocrystalline phosphors were successfully deposited by a solution-combustion method, using rare-earth nitrates, urea and boric acid as starting materials. The crystal structure, morphology, chemical composition and photoluminescence properties of the films were investigated by X-ray diffraction (XRD) and atomic force microscopy (AFM). The results of SEM and XRD revealed that the powders were composed of spherical YBO_3:Tb~(3+) nanocrystals with average grain size of between 50 and 100 nm. The electron diffraction spectroscopy (EDS) confirmed the presence of the Y, B, O, and C. The XRD measurements revealed YBO_3:Tb~(3+) (JCPDS:83-1205) structure when annealed at 1000°C for 2 h. The YBO_3:Tb~(3+) powders exhibited emissions at 490, 545 and 585 nm, which were assigned to the 5D_(4-) 7F_6, 5D_4-7F_5 and 5D_4-7F_4 transitions of Tb~(3+), respectively. Among them, the green emission at 545 nm (5D_4-7F_5) was dominant.