Luminescence properties and preparation of Lu_3Al_5O_(12) powder doped with Ce and Prions

摘要

Lu~(3)Al~(5)O~(12):Ce_(3+)phosphor powder, which exhibits green emission band, was synthesized by the high-temperature solid-state reaction method with a flux BaF~(2). X-ray diffraction (XRD), photoluminescence (PL) spectra, and fluorescent lifetime spectra were used to characterize the structure and luminescent properties of the sample. The XRD patterns indicated that when prepared at 1550 °C for 3 h with 4 wt% flux, Lu~(3)Al~(5)O~(12):Ce_(3+)phosphors powder is the garnet cubic crystal system structure. Photoluminescence (PL) spectra showed that the Lu~(3)Al~(5)O~(12):Ce_(3+)phosphor powder can be effectively excited by near ultraviolet and blue light, emitting broad band peaking at 505 nm, which is attributed to_(2)F~(5/2) → _(2)D~(5/2)transition. The self-concentration quenching mechanism of Ce_(3+)is the dipole–dipole interaction. Small amount of Pr_(3+)increased red light emission at 610 nm. Photoluminescence (PL) spectra and fluorescent lifetime spectra indicated that there was an efficient energy transfer process between Ce_(3+)and Pr_(3+).