An Analvsis of the Decay Properties of the F and M Centers in LiF Crystals

Abstract

An Analv,sis of the Decay Properties of the F and M Centers in L i F Crystals By 1) 2 ) L. BOSI and M. MMISIn the last few years the ag'gregate centers in alkali halides have been extensively studied because of their importance in applied physics (for instance, laser physics). Furthermore, L i F crystals, pure and doped with suitable impurities, have been investigated and utilized f o r dosimetry.

On the M‐Centre Luminescence in Alkali Halides. The Case of NaF and LiF

“…LiF crystals, pure and doped with suitable impurities, have been extensively studied in literature because of their importance in applied physics (for instance laser physics and dosimetry). A very large quantity of different defects are always present in samples coloured by irradiation; unfortunately, nobody has succeeded in obtaining a suitable additive colouration of pure or doped LiF samples [13]. Bosi et al, in the past, studied the decay properties of aggregate centres in LiF and in particular those concerning the M centres (see [13] and references therein).…”

“…A very large quantity of different defects are always present in samples coloured by irradiation; unfortunately, nobody has succeeded in obtaining a suitable additive colouration of pure or doped LiF samples [13]. Bosi et al, in the past, studied the decay properties of aggregate centres in LiF and in particular those concerning the M centres (see [13] and references therein). Nevertheless, an accurate study of the band shapes and peak positions is not present in literature.…”

Charge evolution of F2 centers being in different spin states

“…As compared to other crystals where the triplet state can be created by optical excitation [6,7], in LiF crystal the filling of S-T level crossing seem to occur only in the process of band electron thermalization. That is why the PL intensity of F 2 (S 1 ) centers does not depend on temperature in the interval 80-250 K [8] while the RL intensity decreases with temperature growth (Fig. 1).…”

Medidas de transições ópticas em candidatos a meio laser ativo: aplicação a centros de cor

“…Besides, several other Tl aggregates due to the crystal preparation that perturb o the Tl (1) center were also observed. 43 44 45 46…”