无机化学学报

Ce⁴⁺和Eu³⁺共掺杂的Ca₂SnO₄发光材料的合成与光谱特性

Synthesis and Luminescent Properties of Ca_2-xEu_xSn_1-yCe_yO₄ Phosphor

作者	单位
符史流	汕头大学物理系，汕头 515063
柴　飞	汕头大学物理系，汕头 515063
周　涛	汕头大学物理系，汕头 515063
张汉焱	汕头大学物理系，汕头 515063

摘要: 利用高温固相反应法合成了Ce⁴⁺和Eu³⁺共掺杂的Ca_2-xEu_xSn_1-yCe_yO₄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。Ca_2-xEu_xSn_1-yCe_yO₄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⁺-O^2-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⁺-O^2-蓝色发光的寿命约为81 μs，其能量来源于O^2-和Ce⁴⁺离子间的电荷迁移吸收；而Eu³⁺红色发光的寿命约为830 μs，其能量来源于O^2-和Eu³⁺离子间的电荷迁移吸收。Eu³⁺-O^2-键比Ce⁴⁺-O^2-键更容易吸收紫外光，两者之间没有能量传递现象。

关键词: Ca_2-xEu_xSn_1-yCe_yO₄ 发光特性荧光衰减电荷迁移

基金项目:

Abstract: Eu³⁺ and Ce⁴⁺ 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 Ca²⁺ by Eu³⁺ and Sn⁴⁺ by Ce⁴⁺ has no influence on the structure of Ca₂SnO₄. The emission spectra of Ca_2-xEu_xSn_1-yCe_yO₄ change considerably with the concentrations of Eu³⁺. Blue emission of Ce⁴⁺-O^2- and red luminescence of Eu³⁺ coexist in Ca_2-xEu_xSn_1-yCe_yO₄ with low concentrations of Eu³⁺ whereas only Eu³⁺ emission occurs at higher Eu³⁺ concentrations. The lifetime of Ce⁴⁺-O^2- luminescence is about 81 μs while that of Eu³⁺ emission is about 830 μs. The blue luminescence of Ca_2-xEu_xSn_1-yCe_yO₄ originates from the charge-transfer absorption of Ce⁴⁺-O^2-, however, its red emission originates from that of Eu³⁺-O^2-. The charge-transfer absorption of Eu³⁺-O^2- takes place more easily than that of Ce⁴⁺-O^2-. There is no energy transfer between Ce⁴⁺ and Eu³⁺.

Keywords: Ca_2-xEu_xSn_1-yCe_yO₄ luminescent property fluorescence decay charge-transfer

摘要点击次数: 1724

全文下载次数: 1977

符史流,柴　飞,周　涛,张汉焱.Ce⁴⁺和Eu³⁺共掺杂的Ca₂SnO₄发光材料的合成与光谱特性[J].无机化学学报,2009,25(1):76-80.

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