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Dy2(WO4)3 powders were synthesized through liquid-phase reaction.The structure transformation of Dy2(WO4)3 powders were analyzed by differential scanning calorimetry(DSC),X-ray diffractometer(XRD) and Fourier transform infrared spectroscopy(FTIR).The optical absorption and photoluminescence properties were characterized by UV-vis-infra diffuse reflectance spectra and fluorescence spectra.The Dy2(WO4) 3 host could absorb deep UV light and transfer the energy of UV light to Dy3+ions,which convert the high-energy UV light to blue light(482 nm,4F9/2→6H 15/2) and yellow light(547 nm,4F9/2 →6H 13/2).The Dy2(WO4)3 powders could also absorb near UV light and exhibit blue and yellow emissions near 482 and 547 nm,respectively.Heat treating promoted the crystallization and regulated the micro-structure of Dy2(WO4)3 hosts.The bands of W-O d anti-symmetric stretching vibration exhibited red shift with the increasing of sintering temperature.The W-O b-W groups tended to combine with each other to form W-O c-W groups after heat treating.These regulation of micro-structure had influence on the luminescent color of Dy2(WO4)3.The samples could emit yellow-green,white-yellow and white light under the excitation of 350 nm after being treated at 600,800 and 1 000 ℃,respectively.The prepared Dy2(WO4)3 powders have potential to act as UV absorber for solar cell to improve the conversion efficiency and also exhibit potential for white light LED.
The structure of Dy2 (WO4) 3 powders were analyzed by differential scanning calorimetry (DSC), X-ray diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR). The optical absorption and photoluminescence properties were characterized by UV-vis-infra diffuse reflectance spectra and fluorescence spectra. Dy2 (WO4) 3 host could absorb deep UV light and transfer the energy of UV light to Dy3 + ions, which convert the high- (W4) 3 powders were also able to absorb near UV light and blue light (482 nm, 4F9 / 2 → 6H 15/2) and yellow light (547 nm, 4F9 / 2 → 6H 13/2) Exhibit blue and yellow emissions near 482 and 547 nm, respectively. Heatopha rolled promoted by the crystallization and regulated the micro-structure of Dy2 (WO4) 3 hosts.The bands of WO d anti-symmetric stretching vibration exhibited red shift with the increasing of sintering temperature.The WO bW groups tended to combine with each other t o form WO cW groups after heat treatment. These regulation of micro-structure had influence on the luminescent color of Dy2 (WO4) 3. The samples could emit yellow-green, white-yellow and white light under the excitation of 350 nm after being treated at 600,800 and 1 000 ℃, respectively. The prepared Dy2 (WO4) 3 powders have potential to act as UV absorber for solar cell to improve the conversion efficiency and also exhibit potential for white light LED.