Afterglow and Thermoluminescence spetrum Of SrAl2O4:Eu2+ and SrAl2O4:Eu2+,Dy3+*

Abstract

Abstract:

The properties of afterglow and thermoluminescence spetrum between SrAl2O4:Eu2+and SrAl2O4:Eu2+,Dy3+ are presented and the influence on traps level of SrAl2O4:Eu2+ by codoping Dy3+ is also studied in this paper. From the XRD and Photoluminescence result, the crystal phase and light centre together with emission spetrum can not be changed by codoping Dy3+. From the result of comparison of thermoluminescence properties of SrAl2O4:Eu2+ and SrAl2O4:Eu2+,Dy3+ with different delay time, it is known that the density of the original shallow traps is increased by the codopant of Dy3+,that can enhance the persistent luminescence properties. And also the electrons transfer from the shallow trap to deeper one can be seen from the peak fitting result of thermoluminescence spectrum with diverse delay time. The different decay property with different trap levels at room temperature is the reason for the complicated a long afterglow rule.

Key words: materials∣trap levels∣SrAl2O4∣long afterglow∣thermoluminescence

References

[1]Shi C S,Qi Z M New Development of Long Afterglow Phosphorescent Materials[J].Journal of Inorganic Materials(无机化学学报),2004,19（5）:961-970(in chinese) [施朝淑、戚泽明长余辉（寿合）发光材料研究的最新进展 2004 无机材料学报19 961]
[2]Zhang L J,Hua Y L,Wu X M,Zhang G H,Wang Y,Yin S G.A novel white organic electroluminescent device withboth phosphorescent and fluorescent dopants[J].Acta.Phys.Sin(物理学报) 2008,57(3):1913-1917(in chinese) [张丽娟、华玉林、吴晓明、张国辉、王宇、印寿根同时掺杂磷光和荧光染料的白色有机电致发光器件性能研究 2008 物理学报 57 1913]
[3]Katsumata T., Kohno Y., Kubo H., Komuro S., Morikawa T.. Low temperature flourescence thermometer application of long afterglow phosphorescent SrAl12O19:Eu2+,Dy3+ crystals[J].Rev.Sci.Instrum.2005，76：084901(1-4)
[4]Kubo H.,Aizawa H., Katsumata T., Komuro S., Morikawa T. Characteristics of long afterglow phosphorescent calcium aluminate srystals for fluorescence thermometer application[J].J.Crystal Growth.2005,275:e1767-e1771
[5]Aitasalo T.,Dereń P.,Hōlsā J., Jungener H , Krupa J.C., Lastusaari M..Persistent luminescence phenemena in materials doped with rare earth ions[J].J.Sol.State Chem. 2003,171:114-122
[6]Matsuzawa T., Aoki Y., Takeuchi T. Murayama Y.Mechanism of long phosphorescence of SrAl2O4:Eu2+,Dy3+ and CaAl2O4:Eu2+,Nd3+[J]J.Lumin.1997,72-74:287-289
[7]Dorenbos P.Mechanism of persistent luminescence in Eu2+ and Dy3+ codoped aluminate and silicae eompounds[J].J.Eletrochem.Soc. 2005，152： H107-H110.
[8]Takeyama T.,Nakamura T..Takahashi N., Ohta M.Electron paramagnetic resonance studies on the defects formed in the Dy(Ⅲ)-doped SrAl2O4[J].Solid State Sciences 2007,6:345-348
[9]Arellano-Tánori O., Meléndrez R.Pedroza-Montero M..Persistent luminescence dosimetric properties of UV-irradiated SrAl2O4:Eu2+,Dy3+ Phosphors J.Lumin.2008,128:173-184
[10]Ryu H., Singh B.K., Bartwal K.S..Effect of Sr substitution on photoluminescent properties of BaAl2O4:Eu2+,Dy3+[J]. Physica B 2008，403： 126-130
[11]Wang Xiao-Jun,Dongdong Jia,W.M.Yen.Mn2+ activated green,yellow,and red long persistent phophors[J] J.Lumin. 2003,102-103:34-37
[12]Kuang Jinyong,Liu Yingliang, Zhang Jingxian, Huang Langhua, Rong Jianhua,Dingsheng Yuan.Blue-emittion long-lasting phosphor,Sr3Al10SiO20:Eu2+,Ho3+ Solid State Communication 2005,136:6-10
[13] Zhang J Y,Zhang Z T,Wang T M,Hao W C.Preparation and characterization of a new long afterglow indigo phosphor Ca12Al14O33:Nd,Eu[J].Material Letters 2003，57：4315-4318
[14]Ngaruiya J.M.,Nieuwoudt S.,Ntwaeaborwa O.M.,Terblans J.J., Swart H.C..Resolution of Eu2+ asymmetrical emission peak of SrAl2O4:Eu2+,Dy3+ phosphor by cathodoluminescence measurements[J].Materials Letters 2008，62：3192-3194
[15]Dorenbos P..Energy of the Eu2+ 5d state relative to the conduction band in compounds[J].J.Lumin 2008,128:578-582
[16]Haranath D.,Shanker Virendra,Chander Harish, Sharma Pooja.Studies on the decay characteristics of strontium aluminate phosphor on thermal treatment[J].Material Chem. Phys. 2002,78:6-10 [17]Li J Y 稀土发光材料及其应用[M]（北京：化学工业出版社）2003， p105
[18] Aitasalo T, HōlsāJ, Jungener H ,J Krupa, Lastusaari M, Legendziewicz J, Niittykoski J. Effect of temperature on the luminescence processes of SrAl2O4:Eu2+ [J].Radiation Measurement2004，38：727-730
[19]Tang M D,Li C K,Gao Z W,Xu S H,Jiang X Y,Cai K.The study on long persistence of SrAl2O4:Eu2+ [J].Chinese Journal Of Luminescence (发光学报).1995，16(1)：51-56(in chinese)[唐明道、李长宽、高志武、许少鸿、蒋雪茵、蔡锟 1995 发光学报 16 51]
[20]Nakazawa E., Mochida T.Traps in SrAl2O4:Eu2+ phosphor with rare-earth ion doping[J]. J.Lumin. 1997，72-74：236-237
[21]Shi C S,Fu Y B,Liu B,Zhang G B,Chen Y H,Qi X M,Luo X X.The roles of Eu2+ and Dy3+ in the blue long-lasting phosphor Sr2MgSi2O7:Eu2+,Dy3+[J].J.Lumin 2007，122-123：11-13
[22]Guo C F,Tang Q,Zhang C X,Huang D X,Su Q.Thermoluminescent properties of Eu2+and RE3+ co-doped phosphors CaGa2S4: Eu2+,RE3+(RE=Ln,excluding Pm,Eu and Lu)[J]. J.Lumin. 2007，126：333-338
[23]Osorio E.,Gutierrez O D., Paucar C G., Hadad C.Z..Thermoluminescence glow curves anylysis of pure and CeO2-doped Li2O-Al2O3-SiO2 glass ceramics[J]. J.Lumin. 2009,129:657-660
[24] Chen R, Wang Y H,Hu Y H, Hu Z F, Liu C.Modification on luminescent properties of SrAl2O4:Eu2+,Dy3+ Phosphor by Yb3+ ions doping[J]. J.Lumin. 2008，128：1180-1184
[25]Lü X D,Shu W G.Formation and Roles of Point Defects in SrAl2O4:Eu2+,Dy3+ Phosphors[J].Chinese Journal of Inorganic Chemistry(无机化学学报) 2006,22(5):808 -812(in chinese)
[26]Song H H,Liu W F,Gao Y Z. Microwave Synthesis of Long-1asting Phosphorescence SrAI2O4：Eu2+,RE3+ and Its Luminescent Properties[J].Journal of Synthetic Crystals(人工晶体学报) 2008，37(2)：327-331(in chinese).
[27]Lu S Z,Chen B J, Huang S H,Wang X J,Lu L Z,W M Yen.Thermal excitations in SrAl12O19:Pr3+.Acta.Phys.Sin (物理学报) 2003，52(4)：1009-1013(in chinese).