Funct. Mater. 2013; 20 (3): 295-299.

http://dx.doi.org/10.15407/fm20.03.295

Thallium-doped sulphate potassium crystals as materials for radiation detectors

M.Myrzakhmet[1], M.Nikl[2], V.Jary[2], B.Dalelkhan[1], A.Zhanabergenov[1]

[1]Eurasian National University, 5 Munaytpasov St., 010008 Astana, Kazakhstan
[2]Institute of Physics, Academy of Sciences of Czech Republic, 10 Cukrovarnicka, 16253 Prague, Czech Republic

Abstract: 

Luminescence characteristics of potassium sulphate (K2SO4) crystals doped with thallium were studied. Crystals were grown from water solution at slightly elevated temperature. The nature and properties of the luminescence centres in these crystals have been determined. The main monovalent thallium luminescence centres show the absorption peak at 216  nm and emission one peaking at 285  nm at room temperature. Thallium is substituting potassium which has two different positions in K2SO4 structure. Consequently, two different Tl+ centers were found for thallium centers in these crystals and the third center includes an unspecified perturbation agent nearby. Tl+ centers differ in radiative lifetime at low temperatures and in temperature dependence of decay times measured within 8—300  K.

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