| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1504159 | Solid State Sciences | 2015 | 5 Pages |
•New scheelite-type Gd2W2O9 was synthesized.•Scheelite-type (Gd0.8Eu0.2)2W2O9 showed red light emission.•The fluorescence lifetime was different from monoclinic type polymorph.
New scheelite-type Gd2W2O9 and (Gd0.8Eu0.2)2W2O9 were synthesized by the polymerized complex method at 700 °C for 2 h and were characterized by powder X-ray diffraction (XRD) as well as X-ray photoelectron (XPS), Raman, and luminescence spectroscopies. XRD patterns suggested that the samples crystallized in a scheelite-type structure. XPS results confirmed the existence of Gd3+ and W6+ ions in Gd2W2O9. The scheelite-type samples were expected to exhibit WO4 groups by Raman spectroscopy. Scheelite-type (Gd0.8Eu0.2)2W2O9 showed red light emission corresponding to the 5D0–7F2 transition of Eu3+ under blue light excitation. Its fluorescence lifetime was approximately 1.6 times longer than that of the monoclinic polymorph. These optical properties suggest that scheelite-type Gd2W2O9 may be a suitable host material for phosphors.
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