Synthesis And Multi-wavelength Optical Storage Properties Study Of Tb³⁺ Doped12CaO·7Al₂O₃Ceramic

A novel erasable optical storage ceramic Tb³⁺-doped12CaO·7Al₂O₃(C12A7:Tb³⁺) wasprepared by “Melt-solidification” mathod. The X-ray diffraction （XRD）, excitation spectra,emission spectra, the decay curves of the afterglow，thermoluminescence （TL） curves andphotostimulated luminescence （PSL） were conducted to characterize the microstructure ofC12A7: Tb³⁺ceramic and analysis their optical properties.The results of XRD indicated that the cage structural polycrystalline C12A7ceramic ofsingle cubic phase were obtained. It demonstrated that Tb³⁺had been incorporated intoC12A7lattice site. Under237nm excitation, the emission spectra yield green emissions in theregions of460-650nm, which are due to the5D4-7Fj（j=3,4,5,6） transitions of Tb³⁺ions.Specifically, the emission bands at486nm,543nm,585nm and625nm are attributed to theemission transitions of⁵D₄-⁷F₃,⁵D₄-⁷F₄,⁵D₄-⁷F₅and⁵D₄-⁷F₃, respectively. The excitationspectra indicated that not only237nm but also254nm and486nm could effectively excitedthe Tb³⁺ions.After UV irradiation, the ceramic exhibits obvious afterglow emission andphotostimulated luminescence （PSL） when stimulated by808nm laser light. The results of TLindicated that trap level （E） of C12A7:Tb³⁺are about0.68eV and0.80eV. Kinetic order is2.When the write light changed, the signal is still very legible. So we can use different light aswrite light to realize the optical storage. Besides, we can choose different signal light to read,so realized the multi-wavelength optical storage. As a result, the density of optical storage isimproved. Based on the peculiar energy bands of C12A7, we make a reasonable explanationfor the mechanism of optical storage.Our results suggested that C12A7:Tb³⁺ceramic is promising candidate as optical storagematerial. As the multi-wavelengths emission, the recording density is higher than othermaterials. C12A7:Tb³⁺ceramic will win development in the field of optical storage.