Effect of interaction between electronic excitations on luminescence from fast charged particle’s track’s region

• Main Authors: I. Yu. Goliney, V. I. Sugakov, A. A. Chernyuk
• Format: Article
• Language: English
• Published: Institute for Nuclear Research, National Academy of Sciences of Ukraine 2015-04-01
• Series: Âderna Fìzika ta Energetika
• Subjects: track; high energy particles; exciton; luminescence; anisotropy
• Online Access: http://jnpae.kinr.kiev.ua/16.1/html/16.1.0047.html

The paper studies the effect of the interaction between the electronic excitations (excitons) on the light emission yield of the high energy charged particle in the dielectric medium. It is assumed that after being created in the track, the excitons diffuse from its core. Exciton annihilation and the non-radiative part of its lifetime contribute to the losses that manifest themselves as the decrease of the luminescence intensity. The dependence of the losses on the direction of propagation of the high energy charged particle with respect to the crystal axes for crystals with the exciton diffusion anisotropy is calculated. Dynamic interaction between excitons leads to the changes of their motion, affects the inter-exciton distance, and, hence, causes losses due to annihilation. The estimates of the losses are made depending on the interaction: an increase for the exciton attraction, a decrease for the repulsion. The possibility of the exciton condensation in the track region in the inorganic semiconductors is evaluated.