摘要
以金属烷氧基化合物为原料,采用溶胶 凝胶法在1000℃下合成了Eu3+掺杂的Y3Al5O12(YAG)磷光体。利用TG DSC,XRD和发光光谱等对样品进行了表征。结果表明,YAG∶Eu3+的晶相形成温度为991℃。Eu3+在非晶态和晶态YAG中的发射光谱有明显差异。研究了Eu3+含量和烧结温度对Eu3+的5D0→7F1和5D0→7F2发射峰强度的影响。随煅烧温度的升高和Eu3+浓度的增加,Eu3+发射峰强度增强。
Yttrium aluminates are interesting compounds,in particular with regards to their optical properties.Activation by Ce3+,for example,gives a fastresponse flyingspot scanner phosphor,and activation by Tb3+ gives a characteristic narrowband phosphor suitable for contrastenhanced display applications in high ambient illumination conditions.The YAGbased materials are normally synthesized at a relatively high temperature(>1 500℃) by a solidstate reaction between Al2O3 and Y2O3.Such conditions normally lead to powders of relatively large and widervarying grain sizes and varying impurity content.The solgel method,because of its apparent advantages of fine homogeneity,high reactivity of starting materials and lower sintering temperature,is a new route to synthesize powders. In this study,the Eu3+doped YAG phosphors were synthesized by the solgel process using metal alkoxide at the lower temperature of 1 000℃.The formation process and structure of the phosphor powders were investigated by means of TGDSC,XRD.The purified crystalline phase of YAG were obtained at 1 000℃.The differences for the excitation and emission spectra of Eu3+ in crystalline and amorphous states of YAG were observed,and the emission intensities increased with the increasing of sintering temperature and Eu3+ concentration.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2003年第3期239-242,共4页
Chinese Journal of Luminescence
基金
河南省自然科学基金(0111030200)
河南省教育厅基金(1999150029
2000150038)
河南省高校青年骨干教师基金资助项目
