LUMINESCENCE OF KCL SINGLE-CRYSTALS DOPED WITH GE ATOMS

The emission from KCl:Ge-0 excited in the UV range was measured as a f unction of the exciting photon energy and temperature. The polarized e mission spectrum and the angular dependence of polarization ratio were also investigated. Like KCl:Bi3+, KCl:Ge-0 single crystals produce tw o emission bands peaking at 345 and 395 nm. The interstitial Cl- ion i s assumed to be responsible for the colour centre of the 345 and 395 n m emissions. The definitive assignment of these bands is presented in terms of the adiabatic potential energy surface, in which the Jahn-Tel ler effect is taken into account.