Na_2SrMg(PO_4)_2:Ce^(3+),Mn^(2+)荧光粉的发光性质及其能量传递机理

Photoluminescence properties and energy transfer from Ce^(3+)to Mn^(2+)in Na_2SrMg(PO_4)_2

采用高温固相法制备了Na2Sr Mg(PO4)2:Ce3+,Mn2+(NSMP:Ce3+,Mn2+)荧光粉,并对其发光性质及Ce3+对Mn2+的能量传递机理进行了研究.Ce3+和Mn2+在334 nm和617 nm的发射峰分别为Ce3+的5d→4f跃迁和Mn2+的4T1(4G)→6A1(6S)跃迁产生.Ce3+对Mn2+的发光有较强的敏化作用,根据Dexter能量传递效率公式判断Na2Sr Mg(PO4)2中Ce3+对Mn2+的能量传递属于电偶极-电四极相互作用引起的共振能量传递.

Na2SrMg（PO4）2： Ce3＋, Mn2＋ phosphor was prepared by high temperature solid state reaction. Its luminescence properties and energy transfer from Ce3＋ to Mn2＋ were investigated. The emission bands of Ce3＋ and Mn2＋peaking at 334 nm and 617 nm were attributed to 5d→4f transition of Ce3＋ and 4T1 （4G）→6A1 （6S） transition of Mn2＋, respectively. Dependence of Ce3＋ and Mn2＋ luminescence properties on their concentrations was investigated as well. With the increase of Mn2＋ content, the emission intensity of Ce3＋ could be observed to decrease, however, the emission intensity of Mn2＋ was found to increase. It is indicated that the luminescence of Mn2＋ could be sensitized by energy transfer from Ce3＋ to Mn2＋ in Na2SrMg（PO4）2 host. According to the Dexter＇s energy transfer formula of multipolar interaction, it is demonstrated that the energy transfer between Ce3＋ and Mn2＋ is due to the electric dipole-quadripole interaction of the resonance transfer.