Author： HEBER J. DEMIRBILEK R. LEU B. PAPASHVILI A. G. VOROB'EV I. N. ALIMOV O. K.
Publisher： Taylor & Francis Ltd
ISSN： 1042-0150
Source： Radiation Effects and Defects in Solids, Vol.158, Iss.1-6, 2003-01, pp. : 251-256
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Abstract
CsCdBr3 consists of linear chains of [CdBr6]4− octahedra separated by Cs+ ions. The excited states of the covalently bound [CdBr6]4− octahedra form the lowest excitonic states of the crystal lattice. The trivalent Pr ions substitute for the divalent Cd ions. For reasons of charge compensation in the linear Cd2+ chains, pair centers of the form Pr3+-(Cd vacancy)-Pr3+ are predominantly formed. In CsCdBr3 the optical band gap is wider than the electronic one. This allows to study the interaction between Pr3+ ions and excitons by means of optical spectroscopy. The interaction leads to quantum up- and down-conversion generating one photon from two lower ones in energy and vice versa. Related experiments are discussed.
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