INVESTIGATION OF INTRINSIC LUMINESCENCE OF KI CRYSTALS BY USING POLARIZED LIGHT

As to the intrinsic luminescence of KI and RbI the correlation of polarization between exciting light and emitted light was measured at 4.2°K. The degree of polarization is zero throughout the energy range of the first exciton absorption band. Further no azimuthal dependence is found. These results are discussed in comparison with the emission from α center in KI, for which polarization correlation was observed. In the case of the intrinsic luminescence, it seems most plausible to consider that exciton state relaxes via some unknown intermediate states to the lowest excited state of the (Vk+e) system to emit the luminescence, and the memory of polarization is lost during this relaxation process. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.