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.
参考文献
| [1] | Katsumata T.;Nabae T.;Komuro S.;Morikawa T.;Sasajima K. .Characteristics of strontium aluminate crystals used for long-duration phosphors[J].Journal of the American Ceramic Society,1998(2):413-416. |
| [2] | Wang Dong;Wang Minquan .Research on the phase composition and microstructure of high-efficient phosphor Sr2Al6O11:Eu2+[J].Journal of Materials Science Letters,1999,18:1433. |
| [3] | Lin Yuanhua;Zhang Zhongtai;Zhang Feng et al.Studies on pre paration of aluminats long afterglow photoluminescence materials and their lumin escent mechanism[J].Materials Review(in Chinese),2000,14(01):35. |
| [4] | Matsuzawa T.;Takeuchi N.;Murayama Y.;Aoki Y. .NEW LONG PHOSPHORESCENT PHOSPHOR WITH HIGH BRIGHTNESS, SRAL2O4-EU2+,DY3+[J].Journal of the Electrochemical Society,1996(8):2670-2673. |
| [5] | Tang Mingdao;Li Changkuan;Gao Zhiwu .The study on long persi stence of SrAl2O4:Eu2+[J].发光学报,1995,16(01):51. |
| [6] | Wang Dong;Wang Minquan .Research Application and Development of Alkaline-earth Aluminates Phosphors Actived by Eu3+[J].Materials Science and Engineering,1998,16(04):40. |
| [7] | KATSUMATA T;Nabae T;Sasajima K et al.Effects of compositio n on the long phosphorescent SrAl2O4: Eu2+ Dy3+ phosphor cryst als[J].Journal of the Electrochemical Society,1997,144(09):L243. |
| [8] | Jia Weiyi;Yuan Huabiao;Lu Lizhu et al.Cyrstal growth and c haracterization of Eu2+ Dy3+: SrAl2O4 and Eu2+ Nd3+ : CaAl2O4 by the LHPG method[J].Journal of Crystal Growth,1999,200:179. |
| [9] | Yan Yifei;Bei Yaowu;Lu Hua .Studies on afterglow properties of Sr4Al14O25: Eu2+[J].Journal of Guangxi Academy of Science,1996,12(01):4. |
| [10] | Smets B;Rutten J;Hoeks G .2SrO*3Al2O3: Eu2+ and 1 29(Ba Ca)O*6Al2O3: Eu2+ two new blue-emitting phosphors[J].Journal of the Electrochemical Society,1989,136(07):2119. |
| [11] | Akiyama M.;Matsui H.;Nonaka K.;Watanabe T.;Xu C. .Photostimulated luminescence phenomenon of Sr(4)AI(14)O(25): Eu, Dy using only visible lights[J].Journal of Materials Science Letters,2000(13):1163-1165. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%