硼组分在 BaAl2Si2O8∶Eu2+发光材料中的作用

Abstract

A series of phosphors Ba0.955Al2-xBxSi2O8∶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 Ba0.955Al2-xBxSi2O8∶ 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.