Na2SrMg(PO4)2: Ce3+, Mn2+荧光粉的发光性质及其能量传递机理

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Na₂SrMg(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.

Photoluminescence prop erties and energy transfer from Ce3+ to Mn2+ in Na2SrMg(PO4)2

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.