The Luminescent Properties And Vibrational Spectral Properties Of CaAl <2> 2 O ₈ (Eu, Nd) Luminescent Materials

CaAl₂Si₂O₈is shelf-like aluminosilicate structure. Ca2+ filling in the large gaps in backbone. Silicon （Al） tetrahedron are connected to a common horns like a frame in three-dimensional space. CaAl2Si2O8 has high chemical and thermal stability. It is a kind of matrix, which has excellent luminescent properties. The nature of the anorthite produced in basic igneous. At any temperature, anorthite and albite may be miscible in any proportionand. Therefore, the output nature rarely pure anorthite. Using less expensive mineral materials to synthesize anorthite and studying the properties of anorthite is meaningful. Because of the technology of synthesising become more and more mature. The technology of synthesising phosphors started to be come a research hotspot.This thesis mainly explored the Ca1-xAl2Si2O8:（Eu, Nd）x（x=0,0.01,0.05,0.15） fluorescent material preparation. Discussed the luminescent properties and the vibrational spectra characteristic of the fluorescent material is also the main work of this paper. In this study, a series of Ca1-xAl2Si2O8:（Eu, Nd）x（x=0,0.01,0.05,0.15） fluorescent materials were sintered by solid phase sintering method from different temperatures（1150～1450 ℃/4h）. All of the samples were sintered in an air atmosphere. A lot of instruments were used to study the effects of temperature and the amount of rare earth doped crystal structure of these fluorescent materials, such as X ray diffraction（XRD）, Raman spectroscopy（Raman）, photoluminescence spectroscopy （PL） and X ray fluorescence spectrometer （XRF）. Relationship between the surface structure of the Ca1-xAl2Si2O8:（Eu, Nd）x（x=0,0.01,0.05,0.15） fluorescent materials and its fluorescence intensity was also stadyed by these instruments.1) XRD shows that with the temperature rising, the raw material gradually crystallized.1350 ℃/h and 1450 ℃/h are the best processing to sinter Ca1-xAl2Si2O8:（Eu, Nd）x（x=0,0.01,0.05,0.15） fluorescent materials.2) From the Raman, high temperature is the causes of the changes in the structure of the sample surface. When the amount of Eu/Nd doped in the samples is same, as the sintering temperature rising, the intensity of vibration peak at 506 cm-1（T-O-T, T:Si） increased gradually. On the other hand, the intensity of vibration peak at 907 cm-1（Al-Si-O） failed.3) PL and XRF results together show that, the higher the temperature the more intense thermal motion of Eu or Nd atoms. Thermal motion of rare earth atoms are not related to the amount of rare earth doped. These rare earth atoms escape to the surface of the samples enhanced the fluorescence properties of the fluorescent materials. The fluorescence intensity and the amount of the rare earth at the surface units area of the samples exists direct ratio relationship.