Citation: DENG Tao-Li, YAN Shi-Run, HU Jian-Guo. Preparation and Up-Conversion Photoluminescence Properties of GdAlO3:Er3+, Yb3+ Phosphors[J]. Acta Physico-Chimica Sinica, ;2014, 30(4): 773-780. doi: 10.3866/PKU.WHXB201402201
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GdAlO3:Er3+,Yb3+ phosphor was prepared by coprecipitation, sol-gel, and solid-state reaction methods, respectively. The effects of the preparation method on the structures, morphologies, surface species, light absorption, and up-conversion photoluminescence (UCPL) of the phosphors were investigated using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, N2 physisorption, absorption spectroscopy, and UCPL spectroscopy. The results showed that preparation using coprecipitation method gave a pure-phase GdAlO3:Er3+,Yb3+ phosphor under milder conditions than those needed for the sol-gel or solid-state reactions. The particles of the phosphors prepared by coprecipitation and sol-gel methods were nanometer sized, and severe particle agglomeration occurred for the sol-gel sample. In contrast, the phosphor particles obtained using the solid-state reaction method were micrometer sized. Under excitation with 980 nm IR radiation, bright green UCPL at wavelengths of 524 and 546 nm, and red UCPL at 659 nm, were observed, with the green emission being dominant, irrespective of the preparation method. A comparison of the UCPL spectra of the phosphors prepared by different methods showed that the phosphor prepared by coprecipitation method showed a much higher emission intensity than the others, and the phosphor prepared by the sol-gel method gave the largest ratio of red to green emission intensities. The FTIR results showed that the phosphor prepared by the sol-gel method had larger amounts of surface CO2, CO32-, and OH- species. Based on the FTIR spectra, the UCPL results for phosphors with different concentrations of Er3+ and Yb3+ as well as the power dependences of UCPL intensities, the energy transfer processes between Yb3+ and Er3+ ions, and UCPL of the GdAlO3:Er3+, Yb3+ phosphors prepared by different methods were discussed.
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