Synthesis and luminescent properties of Eu~(3+) activated Li_3Sr_2La3(Mo04)8 red emitting phosphors

摘要

Novel Li_3Sr_2La_(3-x)(MoO_4)_8: xEu~(3+)phosphor (x=0.01, 0.03, 0.07 and 0.09 mole %) molybdate red phosphors had been synthesized by using a combustion Method at as temperature 750°C. The phase formation of the samples was investigated by X-ray diffraction measurements. The excitation and emission spectra indicated that this phosphor could be excited effectively by the visible light, and then emitted red light with the peaks located at 617nm. Upon 287 nm excitation, this phosphor show characteristic fluorescence ~5D_0 →~7F_J (J = 0, 1, 2, 3, 4) of the Eu~(3+) ions. The electronic transition located at 617 nm corresponding to ~5D_0 →~7F_2 of Eu~(3+) ions, which is stronger than the magnetic dipole transition located at 593 nm corresponding to ~5D_0 →~7F_1 of Eu~(3+) ions. Different pathways involved in emission process have been studied. Concentration quenching has been observed for Eu~(3+) concentration 7%. Eu~(3+) doped Li_3Sr_2La_(3-x)(MoO_4)_8: Eu~(3+) is a promising phosphor for applications in displays and optical devices.