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《Chinese Journal of Luminescence》 2006-02
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New Preparation Process of Long Afterglow Phosphor Eu and Dy Co-doped SrAl_2O_4

HU Jin~(1,2),SUN Jia-lin~(1,2),LIU Jian-liang~(1,2),SHI An~2,XU Mao~2,GAO Qin-qin~2(1.Kunming University of Science and Technology,Kunming 650093,China;2.Kunming Institute of Precious Metals,Kunming 650221,China)  
The activated Al-Sr alloy powder was put immediately into boiling pure water,with liquid-solid(ratio) of 4 ∶1.The system was kept isothermal and stirred until white hydrolysates appears.The hydrolysates contain the mixture of Sr(OH)_2·8H_2O and Al(OH)_3 in main,included a little Al(OH)_3,AlOOH,SrCO_3,and 3SrO·Al_2O_3· 6H_2O.After heat treatment at 700 ℃ for 1 h,the mixture of SrO and α-Al_2O_3,γ-Al_2O_3 were formed.As a precursor,the hydrolysates after heat treatment had been used to prepare long after phosphor Eu,Dy co-doped SrAl_2O_4 at 1 300 ℃ for 1 h.The crystal structure of hydrolysates and Eu,Dy co-doped SrAl_2O_4 were analyzed by XRD.The luminescent properties of long afterglow material were studied.The(results) showed that the crystal structure of phosphor is β phase SrAl_2O_4,the emission spectra of Eu and Dy co-doped SrAl_2O_4 lied near 520 nm,resulted from the character transition of 4f5d-4f of Eu~(2+) ion.The method can improve afterglow properties dramatically.The initial luminescent intensity of long afterglow material reached 18 cd/m~2,and the duration time lasted 46 h.The improved properties are related to precipitation mechanism of AlSr alloy hydrolysates.With this procedure,SrO and Al_2O_3 will disperse evenly to effectively enlarge the contact area of the components,shorten the diffusive distance.As a result the sintering temperature could be decreased,while the reaction speed and the long afterglow fluorescent properties of the materials could be improved.
【Fund】: 云南省科研院所技术开发研究专项基金资助项目(2003KFZX-14)
【CateGory Index】: O482.31
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【References】
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1 Liu Yanhui,Zhao Ying(Department of Chemistry and Chemical Engineering,Hunan Institute of Science and Technology,Yueyang 414000,China);Development of Long-lasting Phosphorescent Materials of Aluminates Hosts[J];Guangdong Chemical Industry;2009-05
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【Co-references】
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1 ZHAO Jun-wu, QI Xiao-xia(Science College,Xi'an Jiaotong University,Xi'an 710049,CHN);Research Progress on Long Persistence Phosphors[J];Semiconductor Optoelectronics;2005-04
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【Secondary References】
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