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BaMgAl10O17:Eu blue phosphors with MgO coating and microwave irradiation
- Source :
-
Journal of Physics & Chemistry of Solids . Feb2008, Vol. 69 Issue 2/3, p446-450. 5p. - Publication Year :
- 2008
-
Abstract
- Abstract: Europium-activated barium magnesium aluminate (BaMgAl10O17:Eu (BAM)) phosphor particles were modified by surface coating with MgO using a polyol method. The photoluminescence (PL) properties of the MgO-coated BAM phosphors showed slightly improved blue-emission intensity compared to the unmodified ones, and reached a stronger peak intensity with 5.25% MgO coating, under vacuum ultraviolet (VUV) 147nm excitation. Upon microwave irradiation on the MgO-coated BAM phosphors, the PL properties of the MgO-coated phosphors exhibited a much enhanced relative PL ratio, and a maximum relative PL ratio can be achieved when as high as 10.5% MgO was deposited on the phosphor surface. However, for mechanically ground phosphor powder, it was found that although the intensity of the MgO-coated BAM turned stronger with increasing MgO concentration under microwave irradiation, the purity of the resulting luminescence was slightly disrupted by the presence of a new peak near 470nm, corresponding to BaMg3Al14O25 compound. [Copyright &y& Elsevier]
- Subjects :
- *PHOSPHORS
*MANGANESE oxides
*SURFACE coatings
*IRRADIATION
Subjects
Details
- Language :
- English
- ISSN :
- 00223697
- Volume :
- 69
- Issue :
- 2/3
- Database :
- Academic Search Index
- Journal :
- Journal of Physics & Chemistry of Solids
- Publication Type :
- Academic Journal
- Accession number :
- 29374409
- Full Text :
- https://doi.org/10.1016/j.jpcs.2007.11.027