【摘要】 以α-Si3N4,AlN,CaCO3,Eu2O3为原料,采用固相烧结法获得了组成为CaxEuySi12-(3x+4.5y)Al3x+4.5yOx+1.5yN16-(x+1.5y)(x=0.220~1.525,y=0.02~0.15)的荧光发光材料。应用X射线衍射(XRD)仪,扫描电子显微镜(SEM),紫外-可见分光光度计和荧光分光光度计,研究了不同组成及烧结工艺对Ca-α-SiAlON:Eu2+的制备,Eu2+掺杂和荧光发射的影响。在所研究的组成范围,可以获得单相、Eu2+掺杂的Ca-α-SiAlON:Eu2+陶瓷粉体。提高烧结温度可以进一步改善Eu2+离子的分布均匀性。Ca-α-SiAlON:Eu2+在紫外-可见光部分具有强烈的吸收,其激发光谱的峰值波长为~270nm、400nm,发射光谱的峰值波长为~570nm。采用氢气,氮气混合气氛烧结合成的Ca-α-SiAlON:Eu2+的发光强度要高于氮气气氛烧结合成的样品。更多还原

【Abstract】 Luminescence conversion materials with the formula CaxEuySi12-(3x+4.5y)Al3x+4.5yOx+1.5yN16-(x+1.5y) (x= 0.220~1.525, y=0.02~0.15) have been synthesized from α-Si3N4, AlN, Eu2O3 and CaCO3 powders. Using X-ray Diffractometer (XRD), Scanning Electron Microscope (SEM), UV-Vis spectrophotometer and fluorescent spectrophotometer, the influences of different compositions and sintering process on Eu2+ distribution and optical properties of Ca-α-SiAlON:Eu2+ were studied. The powders with single Ca-α-SiAlON phase doped Eu2+ have been obtained within the range of composition we studied. Rising sintering temperature can improve the uniformity of Eu2+ dispersion in α-SiAlON lattice. Ca-α-SiAlON:Eu2+ had high adsorption in the UV–visible spectral region. Two broad bands were observed in the excitation spectrum centered at 270 and 400 nm, and a single broad emission band centered at 570 nm was observed in the emission spectrum. Ca-α-SiAlON:Eu2+ phosphors synthesized in the mixture of hydrogen and nitrogen atmosphere had stronger emission intensity than that synthesized in nitrogen atmosphere.更多还原