Funct. Mater. 2013; 20 (4): 451-456.
Time-resolved luminescence spectroscopy study of CsI:Eu crystal
[1]National Research Tomsk Polytechnic University, 30 Lenin Ave., 634034 Tomsk, Russian Federation
[2]Institute for Scintillation Materials, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Lenin Ave., 61001 Kharkiv, Ukraine
[3]Institute for Single Crystals, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Lenin Ave., 61001 Kharkiv, Ukraine
This paper studies the spectral-kinetic properties of CsI:0.8·10–4 % Eu, CsI:1·10–2 % Eu and CsI:3.9·10–1 % Eu crystals. It has been found that spectrum and decay kinetics of photoluminescence depend on concentration of an activator and degree of thermal-dynamic disbalance of CsI:Eu. The emission of all the crystals decays exponentially, but each crystal differs from each other in temperature behavior of the emission decay kinetics. Possible types of the emission centers have been suggested such as single dipole Eu2+–vc, two- and three-dipole clusters of Eu2+–vc– which are responsible for the bands with maxima at 2.69, 2.78 and 2.67 eV, respectively. Criterion for discrimination of the emission centers in CsI:Eu is the temperature behavior of their emission decay kinetics.
1.J.Rubio, J.Phys.Chem.Solids, 52, 101 (1991). http://dx.doi.org/10.1016/0022-3697(91)90062-5
2.E.A.Shuraleva, P.A.Parfianovich, P.S.Ivakhnenko, Spectroscopy of Crystals, Nauka, Moscow (1975) [in Russian].
3.G.A.Babich, L.I.Pashneva, K.F.Kravzova, Single Crystals and Scintillation Materials, ISC Publ., Kharkov (1978) [in Russian].
4.G.A.Babich, E.P.Kisil, Optical and Scintillation Materials, ISC Publ., Kharkov (1988) [in Russian].
5.F.G.Thomas, G.Henze, Introduction to Voltammetric Analysis: Theory and Practice, CSIRO Publishing, Collingwood VIC (2001).
6.G.D.Varenko, V.P.Avdonin, B.T.Plachenov et al., Opt.Spectrosc., 28, 954 (1970).
7.N.M.Bannon, J.Corish, P.W.M.Jacobs, Phil.Mag.A, 51, 797 (1985). http://dx.doi.org/10.1080/01418618508237588
8.M.V.Fohk, Entering into the Kinetics of the Crystal Phosphor Luminescence, Nauka, Moscow (1964) [in Russian].
9.V.Yakovlev, L.Trefilova, A.Meleshko, N.Ovcharenko, J.Lumin., 132, 2476 (2012). http://dx.doi.org/10.1016/j.jlumin.2012.04.026
10.V.P.Savel′ev, V.P.Avdonin, L.D.Dugarova et al., Phys.Solid State, 16, 1090 (1974).
11.A.A.Blistanov, V.S.Bondarenko, V.V.Chkalova et al., Acoustic Crystals, Nauka, Moscow (1982) [in Russian].
12.S.Unger, M.Perlman, Phys.Rev.B, 10, 3973 (1972). http://dx.doi.org/10.1103/PhysRevB.6.3973