采用高温固相法在弱还原气氛中, 1300℃合成了掺杂Eu2+和Dy3+离子的SrAl2O4.对比研究了SrAl2O4:Eu2+和SrAl2O4:Eu2+,Dy3+的余辉特性和热释光谱.并探讨了Dy3+的掺杂对SrAl2O4:Eu2+陷阱能级的影响.XRD分析表明: Eu2+和Dy3+的掺杂没有改变SrAl2O4的晶相.光致发光分析表明:Dy3+的掺杂没有改变SrAl2O4:Eu2+的光致发光光谱和发光中心.热释光谱对比分析结果显示: Eu2+的掺杂在SrAl2O4的禁带中引入了两个深度不同的陷阱能级;Dy3+的掺杂不改变原来陷阱能级的深度,却能够显著地增加原来浅陷阱能级的密度,从而改善SrAl2O4:Eu2+的余辉特性.不同等待时间的热释光谱曲线显示:在室温下,不同陷阱能级衰减规律的差异以及陷阱能级间存在的电子转移,可能造成了SrAl2O4:Eu2+,Dy3+长余辉材料复杂的余辉衰减规律.
参考文献
| [1] | Shi C S,Qi Z M.New development of long afterglow phosphorescent materials[J].Journal of Inoryanic Materials (无机化学学报),2004,19(5):961-970(in Chinese). |
| [2] | Zhang L J,Hun Y L,Wu X M,et al.A novel white organic electroluminescent device with both phosphorescent and fluorescent dopants[J].Acta.Physs.Sin.(物理学报),2008,57(3):1913-1917(in Chinese). |
| [3] | Katsumata T,Kohno Y,Kubo H,et al.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,et al.Characteristics of long afterglow phosphorescent calcium aluminate crystals for fluorescence thermometer application[J].J.Cryst.Growth,2005,275:e1767-e1771. |
| [5] | Aitasalo T,Dere(n) P,et al.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,et al.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,et al.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 UVirradiated SrAl2O4:Eu2+,Dy3+ phosphors[J].J.Lumin.,2008,128:173-184. |
| [10] | Ryu H,Singh B K,et al.Effect of Sr substitution on photoluminescent properties of BaAl2O4:Eu2+,Dy3+[J]Physica B,2008,403:126-130. |
| [11] | Wang Xiaojun,Jia Dongdong,Yen W M.Mn2+ activated green,yellow,and red long persistent phophors[J].J.Lumin.,2003,102-103:34-37. |
| [12] | Kuang Jinyong,Liu Yingliang,Zhang Jingxian,et al.Blue-emitting long-lasting phosphor,SrsAl10SiO20:Eu2+,Ho3+[J].Solid State Communication,2005,136:6-10. |
| [13] | Zhang J Y,Zhang Z T,Wang T M,et al.Preparation and characterization of a new long afterglow indigo phosphor Cal2Al14O33:Nd,Eu[J].Material Letters,2003,57:4315-4318. |
| [14] | Ngaruiya J M,Nieuwoudt S,Ntwaeaborwa O M,et al.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,et al.Studies on the decay characteristics of strontium aluminate phosphor On thermal treatment[J].Material Chem.Phys.,2002,78:6-10. |
| [17] | Li J Y.Rare Earth Lighting Material and Application(稀土发光材料及其应用)[M].Beijing:Chemistry Industry Press,2003,105(in Chinese). |
| [18] | Aitasalo T,HōlsāJ,Jungener H,et al.Effect of temperature on the luminescence processes of SrAl2O4:Eu 2+[J].Radiation Measurement,2004,38:727-730. |
| [19] | Tang M D,Li C K,Gao Z W,et al.The study on long persistence of SrAl2O4:Eu2+[J].Chinese Journal of Luminescence(发光学报),1995,16(1):51-56(in Chinese). |
| [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,Fh Y B,Liu B,et al 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,et al 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,et al.Thermoluminescence glow curves analysis of pure and CeO2-doped Li2O-Al2O3-SiO2 glass ceramics[J].,Lumin.,2009,129:657-660. |
| [24] | Chen R,Wang Y H,Hu Y H,et al.Modification on luminescent properties of SrAl2O4:Eu2+,Dy3+ phosphor by Yb3+ ions doping[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-lasting phosphorescence SrAl2O4: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,et al.Thermal excitations in SrAl12O19:Pr3+[J].Acta.Phys.Sin.(物理学报),2003,52(4):1009-1013(in Chinese). |
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