| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1654645 | Materials Letters | 2005 | 6 Pages |
In this work, we present a novel approach for synthesis of europium (III)-doped SrR2O4:Eu3+ (R=Y, Lu) superfine phosphor with a precursor prepared in water-in-oil microemulsion. The precursor of oxalates formed in a reaction between Sr(NO3)2-Y(NO3)3(Lu(NO3)3)-Eu(NO3)3 and H2C2O4 in reverse microemulsions composed of OP-10, iso-pentanol, cyclohexane and water. X-ray diffraction results confirmed the formation of SrY2O4:Eu3+ and SrLu2O4:Eu3+ at 1000 °C and 900 °C respectively. FE-SEM images showed the superfine powder of SrR2O4:Eu3+ has a rugby-like shape and a diameter of 70–100 nm. Upon excitation with 257–272 nm UV light, all the SrR2O4:Eu3+ (R=Y, Lu) powders show bright red emission due to the 4f–4f transitions of Eu3+ ions, and the highest photoluminescence intensity at 618 nm for SrY2O4:Eu3+ and 615 nm for SrLu2O4:Eu3+ was found at a content of about 9 mol% Eu3+ and 6 mol% Eu3+ respectively. Splitting of the 5D0→7F0 and 5D0→7F1 emission transitions revealed that the Eu3+ ions occupied two nonequivalent sites in the crystalline lattice by substituting Y3+ or Lu3+ ions.
