The deformation stimulated luminescence in KCl, KBr and KI crystals

The features of deformation-stimulated RbI luminescence

“…To date, the nature of E x -luminescence in RbI and KI crystals has been actively discussed, or at least there are two points of view. Most researchers believe that E x -luminescence is an intrinsic luminescence of STEs with a weak-off configuration [8-9, 16, 21], and there is also an opinion that E x -luminescence refers to the emission of electron excitation involving a light sodium cation in RbI lattice [11,[22][23].…”

“…In AHCs, the molecular two-center structure of self-trapped excitons (STEs) is very dependent (sensitive) on the symmetrical arrangement of crystal-forming particles, and the slightest decrease in the lattice symmetry increases the probability of an unstable state of STEs ending in their decay, mainly through two channels: primary radiation defects and luminescence [8][9][10][11].…”

“…Local deformations due to the difference in the sizes of both anionic and cationic homologues [2,5], point vacancy and radiation defects [12][13], as well as uniaxial elastic deformation [6, 11,14] have traditionally been used as reducing the symmetry of the lattice of AHCs.…”

Exciton-like luminescence of KCl matrix under thermoelastic, local and uniaxial deformation

“…A series of original researches have been carried out under direct impact on the channels of radiative relaxation of electronic excitations (EE) in AHC by lowering symmetry of lattice by local deformation due to various sizes of both homologous cations [7,8] and homologous anions [9,10], uniaxial [11][12][13][14][15][16][17] and comprehensive deformation [18][19][20][21][22][23].…”

The nature of luminescence of KI and KI-Na crystals at low temperature deformation after natural decrease in the symmetry of the lattice

“…The luminescence of self-trapped excitons with maxima at 4.42 eV and 2.3 eV was recorded in KI crystals at low temperature deformation along the <100> and <110> directions [9].…”