Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 98, Issue 4, Pages 1236-1244Publisher
WILEY
DOI: 10.1111/jace.13463
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Funding
- Nippon Sheet Glass Foundation for Materials Science and Engineering
- MEXT KAKENHI [24560815]
- JST A-STEP [AS231Z03637C]
- Foundation for Promotion of Material Science and Technology of Japan
- Grants-in-Aid for Scientific Research [24560815] Funding Source: KAKEN
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Rare-earth-free phosphors based on vanadate compounds were investigated, where the vanadates included chloride vanadates ((M2VO4Cl)-V-II), pyrovanadates ((M2V2O7)-V-II), orthovanadates (M-3(II)(VO4)(2)) with divalent cations M-II of Mg, Sr, Ba, and Zn, and oxofluorovanadates (A(I)VOF(4)) with an alkali metal A(I). A chloride pyrolysis method and a liquid phase precipitation method were proposed for preparing the chloride vanadates and pyro- and orthovanadates, respectively. These vanadate compounds showed self-activated photoluminescence (PL) based on the VO4 clusters against the ultraviolet (UV) light irradiation. The colors of PL covered almost the whole visible-light region from blue to yellow as Sr2VO4Cl (deep blue), Ca2VO4Cl (sky blue), Ba2V2O7 (green), Sr2V2O7 (yellowish green), Zn-3(VO4)(2) (yellow), and Mg-3(VO4)(2) (yellow). A correlation was suggested from these compounds between the luminescent colors and the structural feature as the longer V-O distances in the VO4 tetrahedra in the crystal structures led to the longer wavelength in PL. This seemed to be also applicable for the oxofluorovanadates A(I)VOF(4) (A(I)=K and Cs) which contain the VOF4 polyhedra with one O2- ion and four F- ions as the ligands, as they exhibited the reddish PL.
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