Na2SrMg(PO4)2:Ce3+,Mn2+荧光粉的发光性质及其能量传递机理?
Photoluminescence prop erties and energy transfer from Ce3+ to Mn2+ in Na2SrMg(PO4)2
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摘要: 采用高温固相法制备了Na2SrMg(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Na2 SrMg(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。Abstract: 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.
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