Optical Properties of CsI : Tl and CsBr : Tl

Assignment of the Optical Absorption Bands in CsI:Tl and CsBr:Tl by Application of High Pressure

“…I n cesium halide thallous phosphors (CsC1-type crystal structure), we can also observe several absorption bands, but the assignment of these bands is not yet successful [2]. The difficulty in the assignment above comes from the fact that in this case we cannot find the phonon assisted band (the B band) whose intensity has a characteristic temperature dependence.…”

“…On the system of CsBr : T1, only two absorption bands which are lacking the phonon assisted band have been reported [ 2 ] . We obtained, however, two more absorption bands a t 5.78 and 5.16 eV.…”

CsI:Tl+,Yb2+: ultra-high light yield scintillator with reduced afterglow

“…5 presents the optical absorption spectra of group B crystals in the range of 300-800 nm. The abrupt absorbance increase below 330 nm is due to the onset of A-absorption band of Tl + center, 28 30 However, due to the strongly spin forbidden character of 4f-5d transition in Yb 2+ it can be hardly observed in this concentration range. 31 Besides, in the Yb 2+ codoped crystals, the apparent shift of Tl + absorption edge in the codoped crystal was observed (inset of Fig.…”

Low lying resonant band modes in CsBr and CsI crystals doped with In+ and Tl+

“…The eight nearest neighbours located on the corners of a cube form an ample cage around one impurity. (iii) The uv absorption spectrum of the Tl+ centre in CsI caused by electronic transitions is known to display some anomalies compared with the spectrum of T1+ in other alkali halides [14]. There are more absorption bands partly with different temperature dependence than expected for an (ns)2-ion in a crystal field of Oh symmetry.…”