The piezoluminescence emission spectra in γ‐irradiated ultra pure KBr and KCl single crystals are investigated. An isothermal blue shift is observed which increases with the increasing uniaxial pressure. The isobaric thermoluminescence spectra of the same crystals are also measured for comparison. A red shift is observed in this case which increases with the increasing temperature. The results are explained on the basis of the change in the lattice parameter and the band gap energy with pressure and temperature. Glow curve measurements are made to support the proposed explanation.

No abstract

No abstract

It is observed that the intensity of lyoluminescence (LL) (the emission during the dissolution of irradiated crystals) is considerably enhanced in the presence of certain transition metal ions in low concentration, while the LL is quenched due to the presence of certain other transition metal ions. A detailed investigation is carried out to. understand the effect of these metal ions and probable mechanisms are proposed.

No abstract