【摘要】 用固相反应法合成了Sr₄Al₁₄O₂₅:M和Sr₄Al₁₄O₂₅:(M+Sm³⁺)(M=Mn⁴⁺,Cr³⁺)荧光粉,研究了其发光性能.Sm的共掺并没有改变Sr₄Al₁₄O₂₅:Cr³⁺激发带和发射带的位置,但是显著提高了材料的发光性能;Sm共掺Sr₄Al₁₄O₂₅:Mn⁴⁺反而降低了发光强度.对于Cr³⁺,Sm³⁺共掺的Sr₄Al₁₄O₂₅荧光粉,呈现了从Sm³⁺到Cr³⁺的辐射形式的能量传递过程,说明了Sm的共掺对于Sr₄Al₁₄O₂₅:Cr³⁺荧光粉的发光强度提高的原因.更多还原

【Abstract】 The Sr₄Al₁₄O₂₅:M and doped Sr₄Al₁₄O₂₅:M+Sm³⁺(M=Mn⁴⁺,Cr³⁺) phosphors were synthesized by a solid-state reaction method and their luminescent properties were investigated.The results showed that the co-doping of Sm ions did not change the positions of excitation band and emission band but significantly improved the luminescent properties of Sr₄Al₁₄O₂₅:Cr³⁺ phosphors;whereas,the emission intensity of Sr₄Al₁₄O₂₅:Mn⁴⁺ was reduced remarkably when Sm ions were co-doped.In addtion,a radiative-form energy transfer from Sm³⁺ to Cr³⁺ was observed for the first time in the Cr,Sm co-doped Sr₄Al₁₄O₂₅ phosphors.The results indicated that Sm ions could significantly improve the emission intensity of Sr₄Al₁₄O₂₅:Cr³⁺,making the Sm³⁺co-doped Sr₄Al₁₄O₂₅:Cr³⁺ phosphor a promising candidate for the applications in display and solid state lightening.更多还原