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Down‐Shifting and Up‐Conversion Spectroscopic Properties of ( Ca , Mg ) 3 ( VO 4 ) 2 : Yb 3+ , Eu 3+ Phosphors
Author(s) -
Lin HanYu,
Chu ShengYuan
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05322.x
Subject(s) - phosphor , chemistry , analytical chemistry (journal) , physics , optoelectronics , chromatography
We found that substitution of not only a larger ion like Ba 2+ [J. Am. Ceram. Soc., 93, 138 (2010)] but also a smaller one like Mg 2+ (this paper) replacing no >14.9% Ca 2+ ions could enhance integrated down‐shifting ( DS ) emission intensity of red phosphor Ca 3 ( VO 4 ) 2 :0.12 Eu 3+ , indicating that both lattice expansion and contraction can decrease the site symmetry of Eu 3+ in Ca 3 ( VO 4 ) 2 :0.12 Eu 3+ phosphor. This finding is anticipated to improve the Eu 3+ emission intensity of other Eu 3+ –doped phosphors. To further investigate Eu 3+ up‐conversion ( UC ) behaviors, Yb 3+ ion was used as a sensitizer. Interestingly, 5 D 1 → 7 F 3,4,6 transitions of Eu 3+ , which were barely detectable under DS excitation, exhibited strong intensity under UC excitation. A “recycling” process, arising from the 5 D 1 → 7 F 3 transition of Eu 3+ and cross‐relaxation Eu 3+ ( 7 F 3 ) + Eu 3+ ( 5 D 0 ) → Eu 3+ ( 7 F 0 ) + Eu 3+ ( 5 D 1 ), is presumably the leading mechanism of such inconsistency.