Improved photo-luminescence by co-doped lithium in the phosphor system CeO2:Eu3+

被引:16
作者
Huang, Wei [1 ,2 ]
Tan, Yongjun [1 ]
Li, Dewei [1 ]
Du, Hongli [1 ]
Hu, Xiaowu [1 ]
Li, Guizhi [1 ]
Kuang, Yongqing [1 ]
Li, Mei [3 ]
Guo, Dongcai [1 ,2 ]
机构
[1] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Sch Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China
[2] Hunan Prov Key Lab Cost Effect Utilizat Fossil Fu, Changsha 410082, Hunan, Peoples R China
[3] Hunan Houde Environm Protect Technol Co Ltd, Changsha 410082, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
CeO2; Li+ co-doping; Oxygen vacancies; Luminescence; Flux effect; OPTICAL-PROPERTIES; LUMINESCENCE; OXIDATION; EMISSION; NANOCRYSTALS; NANOPHOSPHOR; ENHANCEMENT; IONS;
D O I
10.1016/j.jlumin.2018.10.072
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Li+ co-doping is used as a prevalent way to improve the luminescent intensity of CeO2:Eu3+ [25]. Here, we investigate the structural and luminescent properties of CeO2:Eu(3+ )by the different co-doping ways of Li+ ions, including the direct co-doping of Li+ by hydro-thermal co-precipitation and the indirect co-doping of Li+ by a post calcining of Li2CO3. The different co-doping ways of Li+ ions was found to cause different effect on structure and luminescence of CeO2:Eu3+ phosphor. The result showed opposite trend with conventional explanations [25] where the substitution of Ce4+ with doped Li+ ions are the prime reason for luminescence intensity enhancement. Oxygen vacancies should be formed due to the charge imbalance. It is found that the Li+ direct co-doped CeO2:Eu3+ didn't improve the crystallization of the samples due to the increase of oxygen vacancies, as is supported by X-ray diffraction(XRD) patterns and Raman spectra. Meanwhile, the spectroscopic investigations reveal that the Li+ direct co-doped CeO2:Eu3+ lead to less asymmetry around Eu3+ and lower luminescence. However, results show that the indirect co-doping of Li+ lead to a increase of crystallinity and decrease in oxygen vacancies concentration. The luminescent intensity of CeO2:Eu3+ can be significantly enhanced by indirect co-doping of Li+. Consequently, we reason that the enhanced luminescence mainly results from a increase of crystallinity and decrease in oxygen vacancies concentration due to the flux effect of Li+ ions, instead of the substitution of Ce4+ with doped Li+ ions.
引用
收藏
页码:432 / 439
页数:8
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