ABSTRACT
Experimental and computer-modeling studies of the spectral properties of crystalline AgCl doped with metal bismuth or bismuth chloride are performed. The broad near-IR luminescence band in the 0.8-1.2 µm range with time dependence described by two exponential components corresponding to the lifetimes of 1.5 and 10.3 µs is excited mainly by 0.39-0.44 µm radiation. Computer modeling of probable Bi-related centers in the AgCl lattice is performed. On the basis of experimental and calculation data, a conclusion is drawn that IR luminescence can be caused by Bi+ ion centers substituted for Ag+ ions.
ABSTRACT
Experimental and theoretical studies of spectral properties of crystalline TlCl:Bi are performed. Two broad near-infrared luminescence bands with a lifetime of about 0.25 ms are observed: a strong band near 1.18 µm excited by 0.40, 0.45, 0.70, and 0.80 µm radiation and a weak band at â³1.5 µm excited by 0.40 and 0.45 µm radiation. Computer modeling of Bi-related centers in TlCl lattice suggests that a Bi(+) VCl(Cl)(-) center (Bi(+) in Tl site and a negatively charged Cl vacancy in the nearest anion site) is most likely responsible for the IR luminescence.
