摘要
利用高温固相反应法合成了Ce4+和Eu3+共掺杂的Ca2-xEuxSn1-yCeyO4样品,并对其结构和发光特性进行了研究。X射线衍射结果显示,在Ca2SnO4中同时掺入Ce4+和Eu3+离子没有改变其晶体结构。Ca2-xEuxSn1-yCeyO4样品的发射光谱随Eu3+掺杂浓度产生很大变化,当Eu3+掺杂浓度低时,样品中同时存在着Ce4+-O2-的蓝光发射和Eu3+的红光发射;当Eu3+掺杂浓度较高时,样品呈现出Eu3+离子的红光发射。Ce4+-O2-蓝色发光的寿命约为81μs,其能量来源于O2-和Ce4+离子间的电荷迁移吸收;而Eu3+红色发光的寿命约为830μs,其能量来源于O2-和Eu3+离子间的电荷迁移吸收。Eu3+-O2-键比Ce4+-O2-键更容易吸收紫外光,两者之间没有能量传递现象。
Eu^3＋ and Ce^4＋ co-doped Ca2SnO4 samples were prepared by a solid-state method and their structures and luminescent properties were investigated. The XRD results show that the substitution of Ca^2＋ by Eu^3＋ and Sn^4＋ by Ce^4＋ has no influence on the structure of Ca2SnO4. The emission spectra of Ca2-xEuxSn1-yCeyO4 change considerably with the concentrations of Eu^3＋. Blue emission of Ce^4＋ - O^2- and red luminescence of Eu^3＋ coexist in Ca2-xEuxSn1-yCeyO4 with low concentrations of Eu^3＋ whereas only Eu^3＋ emission occurs at higher Eu^3＋ concentrations. The lifetime of Ce^4＋ - O^2- luminescence is about 81 μs while that of Eu^3＋ emission is about 830 μs. The blue luminescence of Ca2-xEuxSn1-yCeyO4 originates from the charge-transfer absorption of Ce^4＋ -O^2-, however, its red emission originates from that of Eu^3＋ - O^2-. The charge-transfer absorption of Eu^3＋ - O^2- takes place more easily than that of Ce^4＋ - O^2-. There is no energy transfer between Ce^4＋ and Eu^3＋.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2009年第1期76-80,共5页
Chinese Journal of Inorganic Chemistry
基金
汕头大学基金会基金资助项目(No.934064)
广东省汕头市科技计划项目(No.152011)
