Ca-α-SiAlON:Eu^2+荧光发光材料的合成与发光性能  

Synthesis and Photoluminescence of Eu^(2+) Doped Ca-α-SiAlON Phosphor

作　　者：王德刘[1] 傅仁利[1] 何洪[1] 宋秀峰[1] 沈源[1] 徐鑫[2] 

机构地区：[1]南京航空航天大学,江苏南京210016 [2]中国科技大学,安徽合肥230026

出　　处：《稀有金属材料与工程》2008年第4期713-716,共4页Rare Metal Materials and Engineering

基　　金：南京航空航天大学科研启动基金

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。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, AIN, 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 Eu^2＋ distribution and optical properties of Ca-a-SiAION：Eu^2＋ were studied. The powders with single Ca-a-SiAION phase doped Eu^2＋ have been obtained within the range of composition we studied. Rising sintering temperature can improve the uniformity of Eu^2＋ dispersion in a-SiAION lattice. Ca-a-SiAION：Eu^2＋ had high adsorption in the UV-visible spectral region. Two broad bands were observed in the excitation spectrum centeredat 270 and 400 nm, and a single broad emission band centered at 570 nm was observed in the emission spectrum. Ca-a-SiAION：Eu^2＋ phosphors synthesized in the mixture of hydrogen and nitrogen atmosphere had stronger emission intensity than that synthesized in nitrogen atmosphere.

关 键 词：Ca-α-SiAION 荧光材料 白光发光二极管 

分 类 号：TQ422[化学工程] TG146.4[一般工业技术—材料科学与工程]