Ba_(10)(PO_4)_4(SiO_4)_2∶Eu^(2+)荧光体的光谱特性

Spectra Properties of Ba_(10)(PO_4)_4(SiO_4)_2∶Eu^(2+) Phosphor

采用高温固相法合成了荧光体Ba10(PO4)4(SiO4)2∶Ce3+和Ba10(PO4)4(SiO4)2∶Eu2+,研究了两种荧光体的光谱特性。结果表明,两者都呈现较强的宽带激发特征。根据同种基质中Eu2+和Ce3+两种离子光谱特征的相关性,通过测得的Ba10(PO4)2(SiO4)2基质中Ce3+的光谱数据估算了Ba10(PO4)2(SiO4)2∶Eu2+中Eu2+的斯托克斯位移(ΔS)和激发能量,估算结果与Ba10(PO4)2(SiO4)2∶Eu2+样品的光谱分析结果十分吻合。Ba10(PO4)2(SiO4)2∶Eu2+可以同时被紫光和蓝光激发,发出偏白的绿光,可用作白光LED的荧光粉。

The phosphors composed of Eu or Ce ions doped in Ba10(PO4)4(SiO4)2 matrix were prepared by solid state reaction. The PL spectra properties of Ba10(PO4)4(SiO4)2∶Eu2+ and Ba10(PO4)2(SiO4)2∶Ce3+ were investigated. Strong broad excitation band was observed in both samples. The Eu2+ of Stokes shift(ΔS) and excitation energy of Ba10(PO4)4(SiO4)2Eu2+ were calculated by the PL spectra of Ba10(PO4)2(SiO4)2∶Ce3+. The estimated excitation energy and the experiment result are closely coincided. Ba10( PO4)4(SiO4)2∶Eu2+ can be excited by UV-LED or blue LED,and emits absinthe-green light.