Core-valence Luminescence Research Articles

Impurity‐Induced Core–Valence Luminescence in Halide Compounds

AbstractInvestigation of the impurity‐induced core–valence luminescence (IICVL) in doped RbCl:Cs, SrCl2:Cs, and RbCaCl3:Cs crystals is made under pulsed X‐ray excitation (δt ≈ 1 ns). It is shown that the spectral structure and emission intensity of IICVL is determined by the spatial structure of the nearest anion environment of the cesium ion. The model of an isolated emission centre (cluster [CsCln]) for the interpretation of the IICVL peculiarities is proposed.

Ordering behaviors of Cd-Mg and Cd-Zn alloys with the H.C.P.-type structure

The decay of 5pCs-core excitons and holes is studied in halide crystals with intrinsic and impurity core valence luminescence (CVL). Under excitation in the range of 5pCs(j=32) core exciton creation, the CVL does not appear in CsCl and CsBr crystals. However impurity CVL is observed for RbCl–CsCl and RbBr–CsBr mixed crystals under the excitation in the above mentioned region. This peculiarity is interpreted to be a result of thermal decay of core excitations and subsequent interaction of released core holes with valence electrons. The change in the intrinsic CVL decay time in CsCl–Tl crystals is ascribed to the interaction of core holes with impurity Tl ions.