Synthesis of a new scheelite-type Eu3+-doped Gd2W2O9 red light emitting phosphor by the polymerized complex method

• 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.

Figure optionsDownload as PowerPoint slide