Emission properties of EU2+, Mn2+ in MAl2Si2O8 (M = Sr, Ba)
Ye, Shi1,2; Liu, Zhong-Shi1,2; Wang, Xiu-Teng1,2; Wang, Jia-Guo1,2; Wang, Ling-Xuan1,3; Jing, Xi-Ping1,2
AbstractThe emission properties of Eu2+ and Mn2+ in monoclinic SrAl2Si2O8 (M-SAS) and hexagonal BaAl2Si2O8 (H-BAS), both of which have only one alkaline-earth site, were studied. The emission peaks of both EU2+ (405 nm) and Mn2+ (564 nm) in SrAl2Si2O8, are located at longer wavelengths, compared with those in H-BAS (373 nm for Eu2+ and 518 nm for Mn2+), because of the stronger crystal field strength at the Sr site. EPR spectra showed that the g values of Mn2+ are 4.5065 in M-SAS:Mn and 2.0247 in H-BAS:Mn. Magnetic measurements proved that Mn2+ was at high-spin state in both hosts. The large g value of Mn2+ in M-SAS was ascribed to the mixing of the first excitation state to the ground state, both of which have lower d orbital degeneracy due to the lower symmetry of Mn2+ site. The transfer efficiency from EU2+ to Mn2+ was about 10% in M-SAS, higher than that in H-BAS (5%). This was probably because Eu2+ emission overlaps the relatively low excitation level of Mn2+ in M-SAS. In order to obtain high transfer efficiency, it was necessary for the EU2+ emission to overlap the lowest excitation level of Mn2+. The results obtained in this work may be helpful to design the new white or red phosphors for white-light emitting diode (w-LED) applications. (C) 2008 Elsevier B.V. All rights reserved.
KeywordEu2++++ Mn2++++ Crystal Field Luminescence Redshift
Indexed BySCI
WOS IDWOS:000261044800011
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Cited Times:59[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorJing, Xi-Ping
Affiliation1.Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
2.Peking Univ, State Key Lab Rare Earth Mat & Applicat, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Key Lab Photochem, Inst Chem, Beijing 100080, Peoples R China
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Ye, Shi,Liu, Zhong-Shi,Wang, Xiu-Teng,et al. Emission properties of EU2+, Mn2+ in MAl2Si2O8 (M = Sr, Ba)[J]. JOURNAL OF LUMINESCENCE,2009,129(1):50-54.
APA Ye, Shi,Liu, Zhong-Shi,Wang, Xiu-Teng,Wang, Jia-Guo,Wang, Ling-Xuan,&Jing, Xi-Ping.(2009).Emission properties of EU2+, Mn2+ in MAl2Si2O8 (M = Sr, Ba).JOURNAL OF LUMINESCENCE,129(1),50-54.
MLA Ye, Shi,et al."Emission properties of EU2+, Mn2+ in MAl2Si2O8 (M = Sr, Ba)".JOURNAL OF LUMINESCENCE 129.1(2009):50-54.
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