Pressure influence on excitonic luminescence of CsPbBr perovskite.

This study investigates the effect of hydrostatic pressure on the luminescence properties of CsPbBr single crystals at 12 K. The luminescence at the edge of the band gap reveals a structure attributed to free excitons, phonon replica of the free excitons, and Rashba excitons. Changes in the relative intensity of the free and Rashba excitons were observed with increasing pressure, caused by changes in the probability of nonradiative deexcitation.

The Influence of Halide Ion Substitution on Energy Structure and Luminescence Efficiency in CeBrI and CeBrI Crystals.

This study aims to determine the optimum composition of the CeBrI compound to achieve the maximum light output. It is based on calculations of the band energy structure of crystals, specifically taking into account the characteristics of the mutual location of local and band 5d states of the Ce ions. The band energy structures for CeBrI and CeBrI crystals were calculated using the projector augmented wave method.

Computer Modelling of Energy Structure of Yb and Lu Doped LaF Crystals.

The energy band structure, as well as partial and total densities of states have been calculated for LaF:Yb and LaF:Lu crystals within density functional theory using the projector augmented wave method and Hubbard corrections (DFT + U). The influence of geometric optimization on the results of energy band calculations of LaF:Ln crystals (Ln = Yb, Lu) was analysed and the absence of relaxation procedure is confirmed to negatively influence the energy position of states, and the variability between obtained results of different optimization algorithms are within the calculation accuracy. The top of the valence band of LaF is confirmed to be formed by the 2pF-states and the bottom of the conduction band is formed by the 5d-states of La.