[Comparisons of spectral properties of CsI:T1 crystals with various Tl(+)-doped concentrations].

Absorption Spectra and Photoluminescence(PL) spectra of CsI∶Tl crystals with various Tl+-concentrations were measured for absorption and luminescent research in CsI∶Tl.Their UV absorption spectra contained three peaks at 297,273 and 247 nm.The experiments were demonstrated that the peaks in the high Tl+-concentration CsI∶Tl crystals are broader than ones in the low Tl+-concentration crystals and their absorption A-peak shift by 20 nm,but their PL with UV excitations are similar.It was suggested that lattice distortions in the high Tl+-concentration CsI∶Tl lead to the changes in absorption or fluorescence excitation peaks,but no changes in the fluorescence band widths and locations at room temperature.