Effects of SrO/Al2O3 Molar Ratio on the Luminescent Characteristics of Rare-Earth Strontium Aluminate Phosphors
来源期刊：JOURNAL OF RARE EARTHS2002年第4期
论文作者：张玉军 谭砂砾 尹衍升
Key words：rare earths; luminescence materials; strontium aluminate; characteristics;
Abstract: The study on the effects of SrO/Al2O3 molar ratio on the crystalline phases and photoluminescence characteristics of strontium aluminate phosphors co-activ ated with Eu2+ and Dy3+ were conducted by X-ray powder diffractomet ry, fluorescence spectrometer and photometer. The strontium aluminate luminescen t materials with different SrO/Al2O3 molar ratio emit the visible lights wit h different color tone after removal of excitation. The peak wavelengths of the emission spectra drift in the direction of short wave, the quantity of Sr4Al 14O25 crystalline phase increases and the afterglow time lengthens wit h the SrO/Al2O3 reduction. The results show that when the SrO/Al2O3 mola r ratio is near 1, the photoluminescence materials have high luminescent intensi ty, and when it is near 0.75, they have long afterglow time. However, when SrO/ Al2O3 molar ratio is more than 1, the luminescent materials appear strong al k aline in water solution; when SrO/Al2O3 molar ratio is much less than 0.75, the samples need a higher temperature to be sintered.
张玉军1，谭砂砾2，尹衍升1
(1.Education Ministry Key Laboratory of Lquid Structure and Heredity of Materials, Shandong University, Jinan 250061, China;
2.School of Environment Science and Engineering, Shangdong University, Jinan 250061, China)
Abstract:The study on the effects of SrO/Al2O3 molar ratio on the crystalline phases and photoluminescence characteristics of strontium aluminate phosphors co-activ ated with Eu2+ and Dy3+ were conducted by X-ray powder diffractomet ry, fluorescence spectrometer and photometer. The strontium aluminate luminescen t materials with different SrO/Al2O3 molar ratio emit the visible lights wit h different color tone after removal of excitation. The peak wavelengths of the emission spectra drift in the direction of short wave, the quantity of Sr4Al 14O25 crystalline phase increases and the afterglow time lengthens wit h the SrO/Al2O3 reduction. The results show that when the SrO/Al2O3 mola r ratio is near 1, the photoluminescence materials have high luminescent intensi ty, and when it is near 0.75, they have long afterglow time. However, when SrO/ Al2O3 molar ratio is more than 1, the luminescent materials appear strong al k aline in water solution; when SrO/Al2O3 molar ratio is much less than 0.75, the samples need a higher temperature to be sintered.
Key words:rare earths; luminescence materials; strontium aluminate; characteristics;
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