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Comparison study of two aldehyde group finishing agents in surface modification of up-conversion luminescence materials

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Rare Metals 2008年第2期27卷 127-130页

作者： CUI Lili FAN Huili XIAO Junping XU Xiaowei Department of Chemistry University of Science and Technology Beijing Beijing 100083 China Department of Inorganic Nonmetallic materials University of Science and Technology Beijing Beijing 100083 China

Surface modification of up-conversion luminescence materials （Na[Y0.57Yb0.39Er0.04]F4 modified by amino groups） by grafting and modifying with aldehyde groups was studied by means of Fourier transform infrared spectroscopy （FTIR）, scanning electron microscopy （SEM）, thermogravimetric analysis （TGA）, and emission spectrum （EM）. The surface modification effect was compared using two different finishhag agents, p-phthalaldehyde and glutaraldehyde. It was found that the surface of up-conversion luminescence materials could be modified by aldehyde groups of the two finishing agents, the systematic dispersibility and the thermostability of the up-conversion luminescence material modified by p-phthalaldehyde were better than those of the material modified by glutaraldehyde, and the luminous intensity of the material modified by p-phthalaldehyde was increased. The AI （the ratio of the suspended segmental quality in the specimen to the total mass of the specimen） of the material modified by p-phthalaldehyde was higher than that of the material modified by glutaraldehyde. It is obviously seen that the embellishment effect of p-phthalaldehyde as a finishing agent was better than that of glutaraldehyde. In addition, the reasons why p-phthalaldehyde is a good finishing agent are also explained.

关键词： luminescence materials up-conversion surface modification luminescence aldehyde groups

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Effects of SrO/Al_2O_3 Molar Ratio on the Luminescent Characteristics of Rare-Earth Strontium Aluminate Phosphors

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Journal of Rare Earths 2002年第4期20卷 322-324页

作者：张玉军尹衍升谭砂砾 Lab. of Liquid Structure Shandong Univ. Jinan 250061 China Sch. of Environ. Sci. and Eng. Shangdong Univ. Jinan 250061 China

The study on the effects of SrO/Al 2O 3 molar ratio on the crystalline phases and photoluminescence characteristics of strontium aluminate phosphors co-activated with Eu 2+ and Dy 3+ were conducted by X-ray powder diffractometry, fluorescence spectrometer and photometer. The strontium aluminate luminescent materials with different SrO/Al 2O 3 molar ratio emit the visible lights with different color tone after removal of excitation. The peak wavelengths of the emission spectra drift in the direction of short wave, the quantity of Sr 4Al 14O 25 crystalline phase increases and the afterglow time lengthens with the SrO/Al 2O 3 reduction. The results show that when the SrO/Al 2O 3 molar ratio is near 1, the photoluminescence materials have high luminescent intensity, and when it is near 0.75, they have long afterglow time. However, when SrO/Al 2O 3 molar ratio is more than 1, the luminescent materials appear strong alkaline in water solution; when SrO/Al 2O 3 molar ratio is much less than 0.75, the samples need a higher temperature to be sintered.

关键词： rare earths luminescence materials strontium aluminate characteristics

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Synthesis of Y_2O_3:Eu^(3+) Hollow Spheres Using Silica as Templates

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Journal of Rare Earths 2007年第4期25卷 407-411页

作者：刘桂霞洪广言董相廷王进贤 School of Chemistry and Environmental Engineering Changchun University of Science and Technology Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences

The Y2O3 ： EU^3 ＋ hollow spheres were synthesized using the template-mediated method. XRD patterns indicated that the broadened diffraction peaks resulted from nanocrystals in Y2O3 ： EU^3 ＋ shells of hollow spheres. XPS spectra showed that the Y2O3 ： EU^3 ＋ shells were linked with silica cores by a Si-O-Y chemical bond. SEM and TEM observations showed that the size of the SiO2/Y2O3 ： EU^3 ＋ core-shell particle was about 100 nm, and the thickness of the Y2O3 ： EU^3 ＋ hollow sphere was less than 5 nm. The photoluminescence spectra of the SIO2/Y2O3 ： EU^3 ＋ core-shell materials and Y2O3 ： EU^3 ＋ hollow spheres had red luminescent properties, and the broadened emission peaks came from nanocrystals composed of the Y2O3 ： EU^3 ＋ shell.

关键词： nanostructure luminescence materials nanocomposites optical properties rare earths

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