Funct. Mater. 2016; 23 (4): 540-545.
Time-resolved Ax-luminescence of NaI:Tl under electron pulse irradiation
1Tomsk Polytechnic University, 30 Lenin Ave., 634034 Tomsk, Russian Federation
2National University of Civil Protection, 94 Chernyshevska Str., 61023 Kharkiv, Ukraine
3Institute for Scintillation Materials, STC Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
This paper studies spectral-kinetic properties of NaI:Tl cathodoluminescence registered in the region of Ax-band with maximum 425 nm within the time interval of 10-8-10-2 s. Ax-luminescence of NaI:Tl crystal has been excited with an electron pulse (Ee = 0.25 MeV, t1/2 = 10 ns, W = 0.003...0.16 J/cm2) at temperatures in the range of 65-300 K. It has been found that the cathodoluminescence kinetics of NaI:Tl crystal at 425 nm has beside the exponential decay (τ = 235 ns at T = 295 K) also three more components: the fastest exponential decay (τ = 12 ns at T = 78 K), post-irradiation rise on a submicrosecond time scale at T≥128 K and slow exponential decay at T≥160 K. A model has been suggested according to which Ax-luminescence at 425 nm is caused by 11→1S0 electron transition of Tl+ ion. It has been explained that the fast decay and post-irradiated rise components are caused by 3P1→1P1 and 3P0→3P1 electron transitions of Tl<m^>+ ion, respectively. The scintillation process in NaI:Tl has been discussed.
1. I.K.Plyavin, Opt. Spektr., 7, 71 (1959).
2. M.P.Fontana, W.J.Van Sciver, Phys. Rev., 168, 960 (1968). https://doi.org/10.1103/PhysRev.168.960
3. R.G.Kaufman, W.B.Hadley, H.N.Hersh, IEEE Trans. Nucl. Sci., 17, 82 (1970). https://doi.org/10.1109/TNS.1970.4325679
4. H.B.Dietrich, A.E.Purdy, R.B.Murray, R.T.Williams, Phys. Rev. B, 8, 5894 (1973). https://doi.org/10.1103/PhysRevB.8.5894
5. M.Ishikane, M.Kawanishi, Jap. J. Appl. Phys., 14, 64 (1975). https://doi.org/10.1143/JJAP.14.64
6. H.Nishimura, T.Kubota, M.Tomura, J. Phys. Soc. Jap., 42, 175 (1977). https://doi.org/10.1143/JPSJ.42.175
7. B.S.Alexandrov, K.D.Ianakiev, P.B.Littlewood, Nucl. Instr. Meth. Phys. Res. A, 358, 432 (2008). https://doi.org/10.1016/j.nima.2007.12.010
8. R.G.Deich, M.S.Abdrakhmanov, D.P.Erts, A.P.Kuyanov, Sol. Stat. Com., 80, 63 (1991). https://doi.org/10.1016/0038-1098(91)90599-Q
9. K.D.Ianakiev, B.S.Alexandrov, P.B.Littlewood, M.C.Browne, Nucl. Instr. Meth. Phys. Res. A, 607, 432 (2009). https://doi.org/10.1016/j.nima.2009.02.019
10. L.Trefilova, V.Yakovlev, A.Meleshko, N.Kosinov, Radiat. Meas., 45, 328 (2010). https://doi.org/10.1016/j.radmeas.2009.10.099
11. M.Henderson. L.J.Curtis, J. Phys. B: At. Mol. Opt. Phys., 29, L629 (1996). https://doi.org/10.1088/0953-4075/29/17/001
12. T.Brage, D.S.Leckrone, C.Froese Fischer, Phys. Rev. A, 53, 192 (1996). https://doi.org/10.1103/PhysRevA.53.192
13. D.R.Beck, Z.Cai, Phys. Rev. A, 41, 301 (1990). https://doi.org/10.1103/PhysRevA.41.301
14. J.Migdalek, W.E.Baylis, J. Phys. B: At. Mol. Phys., 18, 1533 (1985). https://doi.org/10.1088/0022-3700/18/8/012
15. J.Migdalek, A.Bojara, J. Phys. B: At. Mol. Opt. Phys., 21, 2221 (1988). https://doi.org/10.1088/0953-4075/21/12/009
16. B.P.Das, M.Idrees, Phys. Rev. A, 42, 6900 (1990). https://doi.org/10.1103/PhysRevA.42.6900
17. H.S.Chou, K.N.Huang, Phys. Rev. A, 45, 1403 (1992). https://doi.org/10.1103/PhysRevA.45.1403
18. R.Illingworth, Phys. Rev. V, 236, A508 (1964). https://doi.org/10.1103/PhysRev.136.A508
19. M.F.Trinkler, I.K Plyavin, Phys. Stat. Sol., 11, 277 (1965). https://doi.org/10.1002/pssb.19650110125
20. M.P.Fontana, W.J.Van Sciver, H.Blume, Abstr., Intern. Symposium, Rome, September 23-27 (1968), p.99.
21. V.Yakovlev, L.Trefilova, A.Meleshko, Yu.Ganja, J. Luminescence., 131, 2579 (2011). https://doi.org/10.1016/j.jlumin.2011.06.037
22. R.D.Popp, R.B.Murray, J. Phys. Chem. Sol., 33, 601 (1972). https://doi.org/10.1016/0022-3697(72)90069-8
23. D.Shoemaker, Phys. Rev. B, 7, 786 (1973). https://doi.org/10.1103/PhysRevB.7.786
24. R.G.Deich, Izvestiya Akademii Nauk Latviiskoi SSR, Seriya Fiz. -Tekh. Nauk, 2, 51 (1981).
25. V.Yakovlev, L.Trefilova, A.Meleshko, J. Luminescence., 129, 790 (2009). https://doi.org/10.1016/j.jlumin.2009.02.012
26. E.D.Aluker, R.G.Deich, C.A.Chernov, Problems Atomic Science and Technology, Ser. Phys. Rad. Damages and Rad. Mat. Science, 2, 63 (1982).