Nonradiative DKR processes: revisiting the theory. IV. On the controversy over a polaron state bound to an F center in alkali halides

TL;DR

This paper discusses the controversy over the existence of polaron states bound to F centers in alkali halides, emphasizing their potential role in concentration-dependent luminescence quenching and calling for further experimental studies.

Contribution

It revisits the theoretical debate on polaron states bound to F centers and highlights the need for additional research in various alkali halide hosts.

Findings

Limited experimental evidence on polaron-bound F centers.

Polaron states may influence luminescence quenching.

Further studies needed across different alkali halides.

Abstract

We are commenting on an earlier hypothesis of polaron states bound to F centers in alkali halides. These states increasing the effective size of the color centers, they play an active role in concentration-dependent phenomena, such as the observed quenching of F center luminescence. Our record shows only one related study on NaBr and NaI which has also been aimed at checking the bound polaron hypothesis. Further studies of the concentration quenching in other alkali halide hosts whould eventually shine more light on the problem.