蓝色长余辉材料Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+)及其基质的VUV-UV激发特性  

VUV-UV Excitation Properties of Blue Long Afterglow Phosphor Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+) and Its Host

作　　者：符义兵[1] 张国斌[1] 戚泽明[1] 施朝淑[1] 罗昔贤 肖志国 

机构地区：[1]中国科学技术大学国家同步辐射实验室,安徽合肥230029 [2]大连路明发光科技股份有限公司,辽宁大连116025

出　　处：《发光学报》2006年第3期320-324,共5页Chinese Journal of Luminescence

基　　金：国家"863"计划(2002AA324060);国家自然科学基金(10404028)资助项目

摘　　要：Sr2MgS i2O7∶Eu2+,Dy3+是一种有效的蓝色长余辉材料,采用高温固相法合成了Sr2MgS i2O7,Sr2MgS i2O7∶Dy3+,Sr2MgS i2O7∶Eu2+及Sr2MgS i2O7∶Eu2+,Dy3+,利用同步辐射研究了它们的VUV-UV激发特性。在真空紫外光激发下,在基质中发现了稍弱的位于385 nm的发射带,在双掺杂的样品中,除了Eu2+的4 f5d→4 f发射带(465 nm)外,还观察到了575 nm处的发射峰;通过和Dy3+单掺杂样品的发射谱比较,发现它是来自于Dy3+的4 f-4 f(4F9/2→6H13/2)跃迁。在它们的激发谱上可以看出Dy3+与基质发射的有效激发均处于真空紫外区,在近紫外及可见区激发下未见到它们发光。另外在Sr2MgS i2O7∶Eu2+,Dy3+中观察到Dy3+的发射也说明了Dy3+在该类长余辉材料中不仅作为陷阱用来延长余辉,而且也以发光中心形式存在于基质中。The Sr2MgSi2O7 ： Eu^2＋ , Dy^3＋ is an excellent blue long afterglow phosphor. Its afterglow can last longer than 20 h. But the mechanism of the afterglow luminescence is not clear so far. In order to study the physical process of the afterglow luminescence, Eu^2＋ , Dy^3＋ singly doped or co-doped silicate ： Sr2MgSi2O7 ： Eu^2＋ , Sr2MgSi2O7 ： Dy^3＋ , Sr2MgSi2O7 ： Eu^2＋ , Dy^3＋ and Sr2MgSi2O7 were prepared and their VUV-UV excitation properties and temperature dependence were studied with synchrotron radiation VUV light. In emission spectrum of Sr2MgSi2O7： Eu^2＋ ,Dy^3＋ under 300 nm excitation, a broad band emission around 465 nm due to 4f^65d→4f^7 transition of Eu^2＋. Its excitation band lied around 360 nm. But under excitation at 172 nm, besides the broad band emission of Eu^2＋, a relative low line emission peaked at 575 nm can also be seen. Compared with the emission spectrum of Sr2MgSi2O7： Dy^3＋, it could be assigned to 4f-4f transition of Dy^3＋. This implied that Dy^3＋ acted as not only traps, but luminescent centers also in the phosphor. In excitation spectra of Sr2MgSi2O7： Dy^3＋ and Sr2MgSi2O7 we could see that both host and Dy^3＋ excitation band were in VUV range. So when Sr2MgSi2O7： Eu^2＋ , Dy^3＋ was excited in UV-Vis range, only Eu^2＋ emission 465 nm band can be recorded and no Dy^3＋ and host emission existed. The phosphor is excited by daylight in applications,thus only the useful Eu^3＋ emission can be observed. These results made the long afterglow phosphor Sr2MgSi2O7： Eu^2＋ ,Dy^3＋ very suitable for practical use.

关 键 词：长余辉材料 同步辐射 Sr2MgSi2O7:Eu^2+ Dy^3+ 真空紫外激发 

分 类 号：O482.31[理学—固体物理]