【摘要】 采用高温固相反应法合成了Ca₁₀K（PO₄）₇:Eu²⁺荧光粉,分别通过Sr部分取代Ca、Ce³⁺掺杂及Mn²⁺共掺杂,探讨了晶场调控、Ce³⁺→Eu²⁺能量传递及Eu²⁺→Mn²⁺能量传递对该体系发光性能的影响规律.XRD测定结果表明,Sr取代Ca对Ca₁₀K（PO₄）₇基质晶格结构无明显影响.光谱测定结果表明:制备得到的Ca₁₀K（PO₄）₇:Eu²⁺荧光粉中,Eu²⁺和Eu³⁺共存.掺杂Ce³⁺有助于Eu³⁺还原为Eu²⁺,大幅度地提高了荧光粉的发光强度.Sr取代Ca可调控晶体场强度,促使Eu²⁺发光光谱红移.共掺杂Mn²⁺,通过Eu²⁺→Mn²⁺能量传递过程实现了蓝绿色和红色双波长发射.在Grassman色度相加原理的基础上,精确调控Sr取代量和Mn²⁺含量得到了组成为Ca_8.8Sr_1.2K（PO₄）₇:0.1Eu²⁺,0.2Ce³⁺,0.1Mn²⁺的荧光粉;在紫外光激发下,该荧光粉可发出理想的白光.这为Eu激活荧光粉中Eu离子价态控制及发光颜色的调控提供了新思路.更多还原

【Abstract】 Ca₁₀K（PO₄）₇:Eu²⁺ phosphors were prepared via the high-temperature solid-state reaction method.The effects of crystal field regulation,Ce³⁺→Eu²⁺ energy transfer and Eu²+→Mn²⁺ energy transfer on the luminescence properties of the system were investigated by partial substitution of Ca with Sr,by Ce³⁺ doping and Mn²⁺ co-doping,respectively.XRD results showed that the lattice structure of Ca₁₀K（PO₄）₇ was not significantly affected by Sr substitution of Ca.Spectral analysis indicated that Eu²⁺/Eu³⁺ coexisted in the Ca₁₀K（PO₄）₇:Eu²⁺ phosphors.Doping of Ce³⁺ facilitated the reduction of Eu³⁺ to Eu²⁺,thus greatly increased the luminescence intensity of phosphors.Sr substitution for Ca could regulate the intensity of the crystal field and promote the red shift of the Eu²⁺ spectrum.Blue-green and red dual-wavelength emission could be realized by co-doped Mn²⁺ through the energy transfer of Eu²⁺→Mn²⁺.A phosphor with the composition of Ca_8.8Sr_1.2K（PO₄）_7:0.1Eu²⁺,0.2Ce³⁺,0.1Mn²⁺,which emitted ideal white light under near UV excitation,was obtained by precisely controlling Sr substitution and Mn²⁺ content,based on the Grassman’s law of color mixing.This presented a new strategy for the regulation of the valence state of Eu ions and control of the luminescence color in Eu-activated phosphors.更多还原