摘要
采用燃烧法合成了新型红色长余辉发光材料Y2O3∶Eu3+,C a2+,T i4+。用X射线衍射仪表征了其结构;用荧光光谱仪测试了激发、发射光谱;以紫外-可见分光光度计测定分析了样品的反射光谱特征。XRD分析证实为立方相的Y2O3。激发光谱为一紫外区内的宽带谱,中心位于253nm,属于Eu3+-O2-的电荷迁移跃迁;发射光谱峰值位于613 nm,对应于Eu3+的5D0→7F2跃迁发射。由于掺杂离子不等价的取代Y3+,形成了电子陷阱和空穴陷阱,两者的复合作用延缓了余辉的衰减。紫外-可见反射光谱得到的结论与荧光激发光谱的结果一致。该样品在紫外线激发下余辉时间长达90分钟。
A red long afterglow phosphorescent material Y2O3∶Eu^3＋,Ca^2＋,Ti4^＋ was fabricated by the method of combustion synthesis, using urea as the reductant and yttrium nitrate as the oxidant. The crystal structure of the obtained sample was characterized by XRD, and its excitation and emission spectra were scanned with spectrofluorometer. A manner of spectral characterizing, UV-VIS reflective spectrum was specifically applied to the sample, acquired through the integrating sphere assembly of spec＇trophotometer. The result shows that the crystal structure of Y2O3∶Eu^3＋,Ca^2＋,Ti4^＋ remains to be cubic system, and its excitation spectrum presents a broad UV band peaked at 253nm, due to the Eu^3＋-O^2- outer orbital electron transsition, and the emission spectrum gives out one main peak at 613nm, arising from the ^5D0→^7F2 electron transition of Eu^3＋. The UV-VIS reflective spectrum of the sample states clearly its spectral characteristics in the absorbance of UV light from another side of view, in accordance with the result of the excitation spectrum. The decay time lasts more than 90 minutes （above 0.32mcd/m^2） after illu minating by the UV light.
出处
《稀土》
EI
CAS
CSCD
北大核心
2006年第2期26-29,共4页
Chinese Rare Earths
关键词
红色长余辉
燃烧法
发光材料
red long afterglow
combustion method
phosphor
