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Effect of lithium ion doping on cubic Gd1.88Eu0.12O3: Enhancement of photoluminescence and thermal stability
Kang, Yipu1; Shimokawa, Yohei1; Ishihara, Yasutaka1; Miao, Lei2; Tanemura, Sakae2; Iwamoto, Yuji1
AbstractLi+-doped cubic Gd1.88Eu0.12O3 powders were synthesized at 1200 degrees C by the solid state reaction method. Under excitation of the charge transfer band of Eu3+ at 245 nm, the Gd1.88Eu0.12O3 exhibited a dominant photoluminescence (PL) red emission peak at 611 nm, which is attributed to the electric dipole transition D-5(0) -> F-7(2) of Eu3+. The dominant PL red emission peak intensity increased with Li+ doping and reached a maximum in the range from 12 to 16 mol%. This intensity was approximately 3 times higher than that of undoped Gd1.88Eu0.12O3. Chemical composition analysis revealed that the Li+ species was completely evaporated from the samples by the heat treatment up to 1200 degrees C. However, during the heat treatment at 600-1000 degrees C, the doped Li+ could promote formation of a liquid phase, which enhanced the crystallite growth of cubic Gd1.28Eu0.12O3 by Ostwald ripening. The thermal stability of the cubic Gd1.88Eu0.12O3 was also improved with respect to the amount of Li+ doping. Even after annealing at 1300 degrees C (higher than the cubic/monoclinic phase transformation temperature of 1250 degrees C) for 72 h, X-ray diffraction pattern analysis indicated that the relative fraction of the cubic phase in the 12 mol% Li+-doped sample was as high as 90%. The relationship between the amount of Li+ doping and the asymmetric ratio evaluated for the PL emission spectrum and PL quantum efficiency of the cubic Gd1.88Eu0.12O3 samples suggested that, in addition to enhanced crystallite growth, the formation of additional oxygen vacancies promoted by Li+ doping contributed to simultaneous enhancement in the PL red emission intensity and the thermal stability of cubic Gd1.88Eu0.12O3 investigated in this study. (C) 2015 Elsevier B.V. All rights reserved.
KeywordLi++ Doped Gd1.88eu0.12o3 Enhancement Of The Pl Intensity Thermal Stability Transition Of The Crystallographic Sites
WOS HeadingsScience & Technology ; Physical Sciences
WOS Subject ExtendedOptics
Indexed BySCI
WOS SubjectOptics
WOS IDWOS:000359329900037
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Nagoya Inst Technol, Grad Sch Engn, Dept Frontier Mat, Showa Ku, Nagoya, Aichi 4668555, Japan
2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Kang, Yipu,Shimokawa, Yohei,Ishihara, Yasutaka,et al. Effect of lithium ion doping on cubic Gd1.88Eu0.12O3: Enhancement of photoluminescence and thermal stability[J]. JOURNAL OF LUMINESCENCE,2015,166:238-243.
APA Kang, Yipu,Shimokawa, Yohei,Ishihara, Yasutaka,Miao, Lei,Tanemura, Sakae,&Iwamoto, Yuji.(2015).Effect of lithium ion doping on cubic Gd1.88Eu0.12O3: Enhancement of photoluminescence and thermal stability.JOURNAL OF LUMINESCENCE,166,238-243.
MLA Kang, Yipu,et al."Effect of lithium ion doping on cubic Gd1.88Eu0.12O3: Enhancement of photoluminescence and thermal stability".JOURNAL OF LUMINESCENCE 166(2015):238-243.
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