SHORT-LIVED LUMINESCENCE OF MIXED SILVER-HALIDES

Two kinds of excitonic luminescence were investigated for the entire s eries of solid solutions, AgBr1-xClx, (0 less than or equal to x less than or equal to 1). The time-resolved spectra observed around 2.5 eV after both pulsed high-power electron beam and N-2-laser irradiations are analyzed in terms of the diffusion-controlled recombination of Fre nkel defects Ag-i(0) and Ag2+Vc-. It is shown that the effective activ ation energy of Ag-i(0) migration is a linear function of the composit ion x; and predominantly two kinds of nearest neighbours contribute to this process. The position of maximum of the excitonic molecule lumin escence found in mixed monocrystals ana fibers reveals a distinctive d ependence on the composition x. Its amplitude and half-width correlate with the optical losses in fibers which could be used for their chara cterization.