Optical Absorption Spectra of KBr:Pb²⁺ Crystals

Abstract

The fundamental properties of the absorption spectra of KBr:Pb2+ crystals have been studied at various temperatures from the liquid helium range to room temperature. The observed absorption bands are assigned to the so-called A, B, C, and D' bands by analogy with the absorption bands of other s2-configuration ions in alkali halide crystals. The B, C, and D ' bands overlap but have been resolved into their components by nonlinear least squares analysis. A discussion is given of the energy separation between the B and C bands in Sn2+-, TI+-, and Pb2+-doped alkali halide crystals.Les proprietCs fondamentales des spectres d'absorption des cristaux de KBr:Pb2+ ont Ct C Ctudites, pour diverses tempiratures allant de la region de I'helium liquide jusqu'i la temperature ambiante. Les bandes d'absorption observCes sont identifiees avec les bandes dites A, B, C et D', par analogie avec les bandes d'absorption de d'autres configurations s 2 d'ions dans des cristaux d'haloginures alcalins. I1 y a superposition entre les bandes B, C et D'; les composantes peuvent cependant &tre sCparCes par un calcul non-linCaire de moindres carres. On prCsente une discussion de la separation en Cnergie des bandes B et C dans des cristaux d'halogenures alcalins dopis avec SnZ+, TI+ et Pb2+.[Traduit par le journal]Can.

Identification of the absorption bands in KI:Pb2+ crystals

“…The C band has been clarified to have a triplet structure, i.e. C,, C,, and C, components [6]. L4s shown in Fig.…”

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

“…For KBr : Pb a t 80 K, the excitation in the region corresponding to the C,, C,, C, components [6] produces an emission band peaking a t 360nm and another large band peaking a t 510 nm. The excitation a t 232 nm produces an additional band a t 390nm, in the same position as the emission a t A, band excitation (Fig.…”

Aggregate Centers in Lead‐Doped Alkali Halides

“…of the s -ion present and has been observed clearly in alkali halides doped with Sn and In , whereas with the heavier ions T1 , Pb only a single asymmetric A band i s observed (4,7,8). Thus a third component for the A band is not to be expected on increasing the concentration of the Pb2+ ions.…”