摘要
使用共沉淀法制备不同掺杂浓度的CeO2∶Eu3+的荧光粉,并利用XRD,激发和发射光谱对其光学性质进行了研究。PL激发光谱中出现300~400nm的源于基质CeO2的强吸收宽带以及较弱的Eu3+的7 F0-5 D2(467nm)吸收峰。由于Ce4+和Eu3+半径十分接近,因而Eu3+在CeO2中具有较高的固溶度。当高浓度Eu3+掺杂CeO2时,出现了7F0-5 D2(467nm)吸收峰的极大增强。在467nm激发下获得了Eu3+的5 D0—7 F1(592nm)和5 D0—7 F2(612nm)跃迁的特征红光发射。与电荷迁移带激发下获得的红光相比,在467nm蓝光激发下获得的红光强度是其5倍。7 F0—5 D2(467nm)的强电子吸收与蓝光LED芯片的输出波长相匹配,在蓝光激发下获得明亮的红光发射。因此,Eu3+掺杂CeO2荧光粉是一种有潜力的用于白光LED的红色荧光粉。
Under different Eu3+concentration,Eu3+doped CeO2 was prepared by co-precipitation method,and the structure and luminescent properties were studied through XRD,excitation and emission spectra.The PLE spectrum shows a broad chargetransfer band from 300~400nm,and a week excitation line at 467 arise from7 F0—5 D2 transition in Eu3+.The red emission arise from5 D0—7 F1(592nm)and 5 D0—7 F2 transitions of Eu3+has a great increase by high concentration doping under 467 nm excitation.The wavelength at 467 nm is nicely fitting in with the widely applied emission wavelengths of blue LED chips.It is indicated that the CeO2∶Eu3+phosphor emits efficiently red emission under the blue light which makes it possible to create white light from a combination of a blue LED chip.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2015年第11期3032-3035,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(61205178
11204024
11274057
11474046)
国家重点基础研究发展计划(973计划)项目(2012CB626801)
辽宁省博士启动基金项目(20121073)
大连市金州新区科技计划项目(2012-A1-051)
中央高校基本科研业务费专项资金(DC201502080302
DC201502080203)
大连民族学院大学生创新创业训练计划国家级项目(G2014038)资助