Li4SrCa(SiO4)2:Ce3+,RE3+荧光粉的制备及其光谱调控研究

Phosphors used for white light-emitting diodes (w-LEDs) should have suitable excitation and emission spectra firstly, which is the basic condition. In this paper, tuning of excitation and emission spectra were achieved on Li4SrCa(SiO4)2:Ce3+ through the introduction of rare-earth ions such as La3+, Gd3+ and Lu3+. Li4SrCa(SiO4)2:Ce3+ has two different luminescent properties, one of which is a blue light at 414 nm when exicted at 360 nm, the other is a near UV light with a excitation band peaking at ~292 nm. The introduction of La3+ can enhance the blue emission and reduce the near UV emission, while Gd3+ and Lu3+ result in the reduction of blue emission intensity. Based on the comparison between the ionic radii, different rare earth ion will lead to different occupancy behaviour of Ce3+ on Sr2+ and Ca2+ sites, which results in tunable luminescent properties. This method should show a reference for the adjustment of luminescent properties.