ZnS:Mn2+,Sm3+粉末材料中Mn2+和Sm3+之间的能量传递

研究了ZnS粉末材料中Mn2+中心和Sm3+中心之间的相互作用.通过测量单独由Mn2+或Sm3+掺杂及Mn2+,Sm3+同时掺杂的ZnS粉末材料的发射光谱、激发光谱、发光衰减以及选择激发发光光谱,证实了Mn2+和Sm3+之间存在偶极子-偶极子相互作用的无辐射能量传递.同时还计算了能量传递几率和传递效率.

ENERGY TRANSFER FROM Mn2+ TO Sm3+ IN ZnS:Mn,Sm POWDER

We have systematically studied the interaction between Mn2+ and Sm3+ centers in ZnS.The emission and excitation spectra and the luminescence decay are measured.It is found that a part of the excitation energy of Mn2+ center can transfer to Sm3+ center.The energy transfer process is nonradia-tive and the interaction between these two centers is dipole-dipole interaction.In the excitation spectrum in which the intensity of Sm3+emission band is recorded for ZnS:Mn,Sm,we have observed five additional bands due to the excitation of Mn2+ion from its ground state 6A1 to different excited states 4T1(4G),4T2(4G),4E(4G),4T2(4D)and 4E(4D).It implies that one can observe the the luminescence of Sm3+ by exciting the Mn2+ center when ZnS is doped with both Mn2+ and Sm3+.As an argument of the energy transfer from Mn2+ to Sm3+,we have shown,in this paper,the emission spectra of ZnS:Mn,Sm under the excitation by laser lines 488nm,514.5nm and 530nm which are close to the excitation bands of Mn2+ center,i.e.490nm and 530nm.