On the Luminescence of KCl:Pb and KBr:Pb Crystals

Abstract

The emission spectra of KCl :Pb and KBr:Pb are measured as a function of the impurity concentration in the crystals. The low energy emission depends stronger on the impurity concentration in crystals than the principal emission andisless excited within the A absorption band than within the C band. The low energy emission is well explained by the existence of a resonant transfer between -v IlP,) + , u I3P1) and p IlP,) + v I3P1) electronic states.Les spectres d'kmission de KC1:Pb et KBr:Pb ont 6th mesur6s en fonction de la concentration des impuretBs dans les crist6aux. L'Bmission de basse 6nergie depend plus fortement que 1'6mission principale de la concentration des impuret6s dans le cristal, et d'autre part, le randament quantique de l'excitation dans la bande C est plus grand que celui de la bande A #absorption. L'Bmission de basse 6nergie est expliquBe par un transfert resonant d'hergie entre lea Btats 6lectroniques -v IlP,) + p lap,) et p llPl> + v ISP,).

On the luminescence of Sn in MaCl crystals

“…Therefore, a unified model for the luminescence behaviour of tin centres in any dispersion state seems possible. The experimental data arc consistent with the luminescent model proposed earlier by us [14]. This model implies a resonant energy transfer between nearby centres belonging to the same dispersion state (Sn2+ ions in dipoles, dimers, etc.).…”

Luminescence of lead‐activated sodium chloride single crystals

“…A luminescent-centre model for free dipoles in a KC1 matrix was proposed in [14]. A similar model able to explain the two emissions under the same excitation is suitable also for the free dipoles in a NaCl matrix.…”