红色荧光材料Sr_3Ti_2O_7:Pr的合成及性能

首次合成了红色荧光材料Sr_3Ti_2O_7:Pr,经过对样品激发、发射光谱、XRD的分析,讨论了具有Ruddlesden-Popper相的Sr_3Ti_2O_7:Pr样品中存在的SrO晶面缺陷对荧光性能的影响,得出SrO层的存在使Pr~(3+)所处的晶体场强度增大、对称性下降,宇称选律部分解禁,同时使Pr-Ti间距减少,由此导致了电荷迁移态(CTS)下降,其激发与发射光谱强度比SrTiO_3:Pr约大20倍.

Synthesis and Properties of Red Phosphor Sr_3Ti_2O_7:Pr

For the first time,red phosphor Sr_3Ti_2O_7:Pr was synthesized by solid reaction route.The samples were characteristic by XRD,PL.The result proves the existence of SrO planar changes the coordinate environments including the increase of the crystal field strength and the decline of the symmetry of the crystal field in which Pr~(3+) situated that results in the part-unforbiden of Laporte selection rule and shortens the distance between Pr~(3+) ion and Ti~(4+) ion,which lower the charge transfer state(CTS),so the energy transfer is more efficient from both the valence to conduction band transition and 5 d state of Pr~(3+) to CTS in Sr_3Ti_2O_7:Pr than in SrTiO_3:Pr.Compared with SrTiO_3:Pr,the brightness of Sr_3Ti_2O_7:Pr under UV exciting is about twenty times as that of SrTiO_3:Pr.