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Structural investigation of the A-site vacancy in scheelites and the luminescence behavior of two continuous solid solutions A1–1.5xEux□0.5xWO4 and A0.64–0.5yEu0.24Liy□0.12–0.5yWO4 (A = Ca, Sr; □ = vacancy)
- Source :
-
Dalton Transactions: An International Journal of Inorganic Chemistry . 4/7/2015, Vol. 44 Issue 13, p6175-6183. 9p. - Publication Year :
- 2015
-
Abstract
- Scheelite compounds with Eu3+ substitution are well-known red-phosphors. We prepared and performed a detailed structural characterization of A1–1.5xEux□0.5xWO4 and A0.64–0.5yEu0.24Liy□0.12–0.5yWO4 (A = Ca, Sr; □ = vacancy) to confirm the A-site vacancy mechanism for charge balance when bivalent A cations were substituted by Eu3+. All compounds crystallize in I41/a with a disordered arrangement of A2+, Eu3+, □ at the A-site. The title compounds are all good red phosphors with a high R/O ratio (∼10), indicating that Eu3+ is located at a significantly distorted cavity. A1–1.5xEux□0.5xWO4 shows a saturation phenomenon at a high doping level, x = 0.20. With the incorporation of Li+, the emission intensity was generally enhanced compared to the Li+-free samples, moreover, an increase of the Li+ content reduces the content of vacancies, resulting in further increase of the luminescence intensity. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SCHEELITE
*PHOSPHORS
*CRYSTAL structure research
*LUMINESCENCE
*LITHIUM ions
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 44
- Issue :
- 13
- Database :
- Academic Search Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 101634420
- Full Text :
- https://doi.org/10.1039/c5dt00022j