The Luminescent Properties Of Rear Earth Co-Doped Aluminsilicates And Luminescent Microsphere With Tm₂O₃

One hundred years ago, people began to investigate the long afterglow phosphors, which experience two eras--the first one is sulfide long afterglow phosphors, the second one is oxygenation long afterglow materials. The oxygenation long afterglow phosphors are green materials. It can be used in many fields.We gave the basic ideas of long afterglow phosphors, the preparation methods in common use and several models of the energy transferring mechanism, and Summarized the investigation of these materials. We expounded our thoughts of work. Introduced our experimental means and the methods of capability research.We prepared xSrO-yAl2O3-zSiO2(x,y,z=1,2,3):Eu3+,Dy3+ series long afterglow phosphors by traditional solid state method. In this paper, by means of some analytical methods such as XRD, the luminescent spectra and decay curves, the structure and luminescent properties of the phosphors were characterized. It was found that the ratio of the Sr/Al and the ratio of Al/Si had something to do with the luminescent properties of the samples. But the Sr/Al ratio had more influence on samples than the ratio of Al/Si. The peak of the spectrum excitated by 365nm decreased with the larger of the ratio of the Sr/Al. And there would be a flat roof when the ratio of the Sr/Al was the same. At the same time, the peak in the excitation spectra was changed from one to two or even more. The changes of the properties of samples as the ratio of the Al/Si did not obey the rule.In addition, we studied high refractive index TiBa glass microspheres doped with Tm2O3 and the Er3+/Yb3+-codoped silicate glass micro-particle. The emission spectra of the TiBa matrix glass and the TiBa glass microspheres under 633nm excitation were measured. The dependences of the emission intensities of the Tm3+-codoped microsphere and matrix glass on the laser power excited with 633nm were researched. It's proved that the emission of the sample was two-photon excitation. The observed resonances could be assigned by the well-known Lorenz-Mie formalism. The emission spectra of the Er3+/Yb3+-codoped silicate glass micro-particle under 976nm excitation were measured. The dependences of the emission intensities of the Er3+/Yb3+-codoped micro-particle on the laser power excited with 976nm were researched. It's proved that the emission of the sample was two-photon excitation too.