Preparation And Research Of Red Afterglow Luminescence Material

This article discussed the preparation, the performance and the mechanism oflong afterglow material at present, faced the main question in view of it, hasemphatically studied the CaTiO3:Pr long afterglow performance. Good technologicalconditions obtained for preparing the CaTiO3:Pr through the solid phase reaction.Based on the obtained better craft conditions, we reseached the influence of codopentseparately carried on the matrix and the activating agent, and we studied the influenceof annealing and coating film on CaTiO3:Pr.We built the long afterglow model of CaTiO3:Pr by characterization, such asSEM, EDS, PL, TL, as well as luminescence decay. We brought forward the relativeluminous intensity concept and thought that the main defeats include V″Ca,PrCa,Vo,TiTi4+3+ in CaTiO3:Pr, the former two defeats boost the sample's performance. Thedecay curve showed the process was a three-period process.The difference of atomic radius of doping ion changed the symmetry of crystalfield in which Pr3+ located and is the primary factor affecting CaTiO3:Pr performance.The electric-negativity of doping ions is greatly advantageous to the sample'sperformance when substitution was equal doping in electric-value. The afterglowperformance of samples weaks after Gd3+ or Y3+ substituted Ca2+ respectively. Eu3+,Sm3+ can transfer the energy to the ion Pr3+ but they cannot be directly stimulatedeffectively by UV and not be able to absorp effectively the enery from matrix crystallattice, so they cannot improve the long afterglow, performance. Dy3+ can bestimulated by UV in CaTiO3:Pr, but can not transfer energy to the Pr3+. Nd3+, Tb3+,Ho3+, Tm3+ are not stimulated in CaTiO3:Pr, they cause the CaTiO3:Pr illuminationperformance and the afterglow performance drop.The process of annealing on CaTiO3:Pr can improve the sample's crystalstructure, reduce the oxygen hole, thereby improve sample's performance. By coatinga ZrO2 film on the surface of the materials, the results show that surface faults isreduced, the intensity of luminescence spectra become stronger, the TL spectrabecome broader and the peak of it moves to the higher temperature, these mean thecoated sample has better performance than the uncoated.