Magneto-optical effects on the emission of self-trapped exciton perturbed by Na impurity in CsI:Na crystal

The tunnelling recombination of trapped holes (VK) and electron (Na0)pairs in CsI:Na crystal was studied by optical detection of ESR and magnetic CD in the 420 nm emission. A model explains the data and allows determine of the tunnelling probabilities

Optical properties of F centers in KCN crystal

Absorption, excitation and emission spectra of F centers in KCN were measured between 4.5-175 K. Due to the cubic to orthorhombic structural phase transition at 168 K, the F band splits into 3 components. Their properties in the antiferroelectric phase (T <83 K) are explained by an internal Stark effect due to the local electric field. The single emission band has a decay time of 21.5 ns at 4.5 K