无机化学学报

钙长石中镓置换骨架铝对结构和Eu²⁺发光特性的影响

Effect of Substituting Ga for Al on Structure and Spectral Properties of Phosphors CaAl₂Si₂O₈∶Eu²⁺

作者	单位
王　飞	温州大学化学与材料工程学院，温州 325035
田一光	温州大学化学与材料工程学院，温州 325035
张　乔	温州大学化学与材料工程学院，温州 325035
赵文光	温州大学化学与材料工程学院，温州 325035

摘要: 采用高温固相法在弱还原气氛下制备了Ca_0.955Al_2-xGa_xSi₂O₈∶Eu²⁺(x=0~1.0)系列荧光粉，研究了Ga³⁺置换Al³⁺对晶体结构和光谱特性的影响。Ga³⁺以类质同相替代CaAl₂Si₂O₈晶格中的Al³⁺形成连续固溶体，晶胞参数a，b，c和晶胞体积V随Ga³⁺置换量呈线性增大；晶面夹角α，β和γ随Ga³⁺置换量的增加呈线性递减。荧光激发谱为宽带，位于230~420 nm，可拟合成4个峰，表观峰值位于352 nm；随着Ga³⁺置换量的增加，半高宽从112 nm减小到98 nm。发射光谱位于375~560 nm，可由421和457 nm两峰拟合而成，表观峰值位于425 nm，随着Ga³⁺置换量的增加，两拟合峰均线性红移，且拟合峰强度比呈线性递减。

关键词: 发光硅酸盐钙长石镓置换 Eu²⁺

基金项目:

Abstract: A series of luminescence phosphors Ca_0.955Al_2-xGa_xSi₂O₈∶Eu²⁺(x=0~1.0) were prepared via solid-state reaction in weak reductive atmosphere. The lattice positions and the luminescent mechanism of Eu²⁺ in the host were discussed, the effects of Ga³⁺-substitution on the host lattices and spectral properties were also investigated. It was found that when Ga³⁺ entered CaAl₂Si₂O₈ lattice and substituted Al³⁺, complete solid solutions formed in the whole range of x=0~1.0. The lattice parameters (a, b, c) and unit cell volume of phosphors Ca_0.955Al_2-xGa_xSi₂O₈∶Eu²⁺(x=0~1.0) increased linearly and the lattice parameters (α, β, γ) decreased linearly as Ga³⁺ content increased. A broad excitation spectrum consists of four excitation bands, which locate between 230 nm and 420 nm，the maximum excitation wavelength of which is at 352 nm，and basically does not change with the substitution of Ga³⁺, but FWHM decreased from 112 nm to 98 nm. The emission spectrum, which is also a broad band between 375 nm and 560 nm，can be fitted by two peaks at 421 nm and 457 nm and its apparent peak is at 425 nm. Two fitted peaks are red shifted and the intensity ratio of the fitted peaks decreases linearly with the increasing of the amount of Ga³⁺-substitution.

Keywords: inorganic non-metallic materials luminescence high-temperature solid-state reaction Ca-feldspar Ga³⁺-substitution Eu²⁺

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王　飞,田一光,张　乔,赵文光.钙长石中镓置换骨架铝对结构和Eu²⁺发光特性的影响[J].无机化学学报,2010,26(12):2170-2174.

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