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Competing roles of defects in SrAl2O4:Eu2+,Dy3+ phosphors detected by luminescence techniques

Published online by Cambridge University Press:  26 May 2016

Y. Wang ,
M. Cui ,
Y. Zhao ,
Z.G. Xia ,
A.A. Finch  and
P.D. Townsend
Y. Wang*
Affiliation:
School of Science, China University of Geosciences, Beijing, 100083, China
M. Cui
Affiliation:
School of Science, China University of Geosciences, Beijing, 100083, China
Y. Zhao
Affiliation:
School of Science, China University of Geosciences, Beijing, 100083, China
Z.G. Xia
Affiliation:
School of Materials Science & Engineering, University of Science and Technology, Beijing, Beijing, 100083, China
A.A. Finch
Affiliation:
Department of Earth & Environmental Sciences, University of St Andrews, Fife, KY16 9AL, UK
P.D. Townsend
Affiliation:
Physics Building, University of Sussex, Brighton, BN1, 9QH, UK
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Thermoluminescence (TL) and radioluminescence (RL) spectra of the long-lasting phosphorescence of SrA12O4:Eu2+,Dy3+ with A1N addition and commercially used SrA12O4:Eu2+,Dy3+ were compared. Their spectra were slowly recorded over the temperature range from 25 to 673 K (400 °C). A1N offers a higher temperature TL peak, which should lengthen the phosphor lifetime. However, both TL and RL, especially that below room temperature, reveal that there are additional decay paths for the samples of SrA12O4:Eu2+,Dy3+ with A1N additions. These new defect sites reduce the phosphor efficiency. Some speculative models of potential sites are proposed and discussed. In addition, discontinuous intensity changes have been observed for both sample types in TL and RL spectra, which are assigned to the transitions of embedded impurity phases. The justification for this model is explained. Suggestions for future experimentation are also considered.

Keywords

defectsdopantluminescence
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 10 , 28 May 2016 , pp. 1403 - 1412
Copyright
Copyright © Materials Research Society 2016 

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References

REFERENCES

Palilla, C.F., Levine, K.A., and Tomkus, R.M.: Fluorescent properties of alkaline earth aluminates of the type MAl2O4 activated by divalent europium. J. Electrochem. Soc. 115, 642 (1968).CrossRefGoogle Scholar
Murayama, M., Takeuchi, N., Aoki, Y., and Matsuzawa, T.: Phosphorescent phosphor. US Patent, 5424006 (1995).Google Scholar
Nakamura, T., Kaiya, K., Takahashi, N., Matsuzawa, T., Rowlands, C.C., Beltran-Lopez, V., Smith, G.M., and Riedi, P.C.: High frequency EPR of europium(II)-doped strontium aluminate phosphors. J. Mater. Chem. 10, 2566 (2000).CrossRefGoogle Scholar
Qiu, J., Gaeta, A.L., and Hirao, K.: Long-lasting phosphorescence in oxygen-deficient Ge-doped silica glasses at room temperature. Chem. Phys. Lett. 333, 236 (2001).CrossRefGoogle Scholar
Murayama, Y., Takeuchi, N., Aoki, Y., and Matsuzawa, T.: ChemInform abstract: A new long phosphorescent phosphor with high brightness, SrAl2O4:Eu2+,Dy3+. J. Electrochem. Soc. 143, 2670 (1996).Google Scholar
Kshatri, D.S. and Karhre, A.: Characterization and optical properties of doped nanocyrstalline SrAl2O4:Eu2+ phosphor. J. Alloys Compd. 588, 488 (2014).CrossRefGoogle Scholar
Jia, W., Yuan, H., Lu, L., Liu, H., and Yen, W.M.: Phosphorescent dynamics in SrAl2O4:Eu2+,Dy3+ single crystal fibers. J. Lumin. 76–77, 424 (1998).CrossRefGoogle Scholar
Aitasaloa, T., Derenc, P., Holsaa, J., Jungnerd, H., Krupae, J.C., Lastusaaria, M., Legendziewiczf, J., Niittykoskia, J., and Strękc, W.: Persistent luminescence phenomena in material doped with rare earth ions. J. Solid State Chem. 1–2, 114 (2003).CrossRefGoogle Scholar
Clabau, F., Rocquefelte, X., Jobic, S., Deniard, P., Whangbo, M.H., Garcia, A., and Le Mercier, T.: Mechanism of phosphorescence appropriate for the long-lasting phosphors Eu2+-doped SrAl2O4 with codopants Dy3+ and B3+. Chem. Mater. 17, 3904 (2005).CrossRefGoogle Scholar
Katsumata, T., Nabae, T., Sasajime, K., and Matsuzawa, T.: Growth and characteristics of long persistent SrAl2O4 and CaAl2O4 based phosphor crystals by a floating zone technique. J. Cryst. Growth 183, 361 (1998).CrossRefGoogle Scholar
Yamamoto, H. and Matsuzawa, T.: Mechanism of long phosphorescence of SrAl2O4:Eu2+,Dy3+ and CaAl2O4:Eu2+,Nd3+. J. Lumin. 72–74, 287 (1997).CrossRefGoogle Scholar
Katsumata, T., Sakai, R., Komuro, S., Morikawa, T., and Kimura, H.: Growth and characteristics of long duration phosphor crystal. J. Cryst. Growth 198, 869 (1999).CrossRefGoogle Scholar
Aitasalo, T., Jungnerd, G., Lastusaari, M., and Niittykoski, J.: Mechanisms of persistent luminescence in Eu2+, Re2+ doped alkaline earth aluminates. J. Lumin. 94, 59 (2001).CrossRefGoogle Scholar
Chen, R.: On the calculation of activation energies and frequency factors from glow curves. J. Appl. Phys. 40, 570 (1969).CrossRefGoogle Scholar
Ege, A., Wang, Y., and Townsend, P.D.: Systematic errors in thermoluminescence. Nucl. Instrum. Methods Phys. Res., Sect. A 2–3, 411 (2007).CrossRefGoogle Scholar
Wang, Y., Can, N., and Townsend, P.D.: Influence of Li dopants on thermoluminescence spectra of CaSO4 doped with Dy or Tm. J. Lumin. 131, 1864 (2011).CrossRefGoogle Scholar
Zhao, Y., Zhou, Y., Jiang, Y., Zhou, W., Finch, A.A., Townsend, P.D., and Wang, Y.: Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate. J. Mater. Res. 30, 3443 (2015).CrossRefGoogle Scholar
Wang, Y., Yang, B., Can, N., and Townsend, P.D.: Correlations between low temperature thermoluminescence and oxygen vacancies in ZnO crystals. J. Appl. Phys. 109, 053508 (2011).CrossRefGoogle Scholar
Raymond, S.G. and Townsend, P.D.: The influence of rare earth ions on the low temperature thermoluminescence of Bi4Ge3O12. J. Phys.: Condens. Matter 12, 2103 (2000).Google Scholar
Ma, L., Xia, Z., and Liu, Q.: Effect of A1N addition on the photoluminescence and phosphorescence properties of SrAl2O4 : Eu2+,Dy3+ phosphors. Opt. Eng. 54, 067105 (2015).CrossRefGoogle Scholar
Luff, B.J. and Townsend, P.D.: High sensitivity thermoluminescence spectrometer. Meas. Sci. Technol. 4, 65 (1993).CrossRefGoogle Scholar
Finch, A.A., Wang, Y., Townsend, P.D., and Ingle, M.: High sensitivity luminescence measurements of materials. in preparation.Google Scholar
Wang, Y. and Townsend, P.D.: Potential problems in collection and data processing of luminescence signals. J. Lumin. 142, 202 (2013).CrossRefGoogle Scholar
Townsend, P.D., Yang, B., and Wang, Y.: Luminescence detection of phase transitions, local environment and nanoparticle inclusions. Contemp. Phys. 49, 255 (2008).CrossRefGoogle Scholar
Peto, A., Townsend, P.D., Hole, D.E., and Harmer, S.: Luminescence characterisation of lattice site modifications of Nd in Nd:YAG surface layers. J. Mod. Opt. 44, 1217 (1997).CrossRefGoogle Scholar
Maghrabi, M., Townsend, P.D., and Vazquez, G.: Low temperature luminescence from the near surface region of Nd:YAG. J. Phys.: Condens. Matter 13, 2497 (2001).Google Scholar
Ayvacikli, M., Ege, A., and Can, N.: Radioluminescence of SrAl2O4:Ln3+ (Ln = Eu, Sm, Dy) phosphor ceramic. Opt. Mater. 34, 138 (2011).CrossRefGoogle Scholar