Recombination processes during excitation of AgCl:Me2+ crystals by ionizing radiation

Abstract

Spectra and temperature vs. intensity plot of radioluminescence of AgCl single crystals both, pure and doped with Cd2+, Pb2+, Mn2+ ions, are studied. Introduction of bivalent activators not only creates new emission bands in the long-wavelength spectral region, but also strongly affects the position and configuration of the only band present in the emission spectrum of nominally pure AgCl (cationic impurities < 10−7): the band maximum shifts from 498 to 480 nm, its halfwidth changes from 0.39 to 0.29 to 0.35 eV and the activation energy of thermal quenching, from 0.05 to 0.18 to 0.21 eV. The experimental data give reasons to ascribe the short-wavelength luminescence to a [Ag++Cl−6Ag11Vk]Me2+ complex and that of long-wavelength luminescence to the Me2+ activator ion. In the first case free electrons radiatively recombine with trapped holes, while in the second case a recombination of holes with localized electrons takes place. [Russian text Ignored.]