硼组分在BaAl2Si2O8:Eu2+发光材料中的作用

采用高温固相法在弱还原气氛下制备Ba0.955Al2-xBxSi2O8:Eu2+(x=0～0.5)系列荧光粉,研究B3+置换Al3对晶体结构和光谱特性的影响.B3+以类质同相替代BaAl2Si2O8晶格中的Al3+形成部分连续固溶体,随着B3+置换量的增加,晶胞参数a,b,c和晶胞体积V呈线性递减,晶面夹角β呈线性递增...

Spectral Properties in Boron Doped Phosphors BaAl2Si2O8∶Eu2+

A series of phosphors Ba_0.955Al_2-xB_xSi₂O₈ ∶ Eu²⁺(x=0~0.5) were prepared by solid-state reaction in weak reductive atmosphere. The lattice positions and the luminescent mechanism of Eu²⁺ in the host were discussed. The effects of B³⁺-substitution on the host lattices and spectral properties were also investigated. It was found that when B³⁺ entered BaAl₂Si₂O₈ lattice and substituted for Al³⁺ complete solid solutions formed in the whole range of x=0~0.5. The lattice parameters (a, b, c) and unit cell volume of phosphors Ba_0.955Al_2-xB_xSi₂O₈ ∶ Eu²⁺ (x=0~0.5) decreased linearly and lattice parameter β increased linearly as boron content increased. A broad excitation spectrum consists of four excitation bands, which locate between 225 nm and 400 nm,its peak wavelength is at 337 nm,and basically does not change with the content of B³⁺. The full width at half maximum is 93 nm. The emission spectrum is also a broad band between 370 nm and 600 nm and its apparent peak is at 437 nm,which can be fitted by two peaks at 423 nm and 457 nm.Two fitted peaks are blue shifted with the increasing of the content of B³⁺-substitution.