Eu,Dy共掺杂SrAl_2O_4长余辉材料制备新工艺  

New Preparation Process of Long Afterglow Phosphor Eu and Dy Co-doped SrAl_2O_4

作　　者：胡劲[1] 孙家林[1] 刘建良[1] 施安[2] 徐茂[2] 高勤琴[2] 

机构地区：[1]昆明理工大学,云南昆明650093 [2]昆明贵金属研究所,云南昆明650221

出　　处：《发光学报》2006年第2期179-182,共4页Chinese Journal of Luminescence

基　　金：云南省科研院所技术开发研究专项基金资助项目(2003KFZX-14)

摘　　要：活化A l-Sr合金粉末水解制备SrA l2O4长余辉材料的前驱体,并采用高温固相反应法制备出Eu,Dy共掺杂的SrA l2O4长余辉材料,对其微观结构和发光特性进行了研究。实验结果表明:前驱体中A l、Sr元素在微观状态下分布均匀,所制成的长余辉发光材料的发射主峰位于520 nm附近,为典型的Eu2+离子4 f5d-4 f的特征发射,初始亮度达到18 cd/m2,余辉时间长达46 h。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 · 8H20 and Ak （OH）3 in main, included a little Al（OH） 3, AlOOH, SrCO3, and 3SrO · Al2O3 · 6H2O. After heat treatment at 700℃ for 1 h, the mixture of SrO and α-Al2O3 ,γ-Al2O3 were formed. As a precursor, the hydrolysates after heat treatment had been used to prepare long after phosphor Eu, Dy co-doped SrAl2O4 at 1 300 ℃ for 1 h. The crystal structure of hydrolysates and Eu, Dy co-doped SrAl2O4 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 SrAl2O4, the emission spectra of Eu and Dy codoped SrAl2O4 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 Al-Sr alloy hydrolysates. With this procedure, SrO and Al2O3 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.

关 键 词：长余辉发光 Al-Sr合金 水解 铝酸锶 

分 类 号：O482.31[理学—固体物理]