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International Conference on Luminescence - 1984

Cooperative Optical Transitions in CaF2:Yb3+

H.Y. Zhang, Richard T. Brundage, William M. Yen

Published Jan 1, 1984• 0 citations
Publisher

Abstract

It has been shown that Yb3+ ions in crystalline hosts can exhibit optical transitions involving pairs of ions, either two Yb3+ ions1 or Yb3+ paired with another rare earth, such as Gd3+, 2 or upconversion processes involving a number of Yb3+ ions.3 We have studied such transitions in CaF2:Yb using tunable laser spectroscopy.
DOI
10.1364/icol.1984.tud20

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Recently, we observed ultraviolet luminescence in CaF2:Yb3+ under the excitation of a 980 nm laser. In this paper, cooperative transition theory of three identical lanthanide ions is built through perturbed wave functions of a three-body system with electric multipole interactions. The theoretical results show that d-dd-dq and crystal field effected d-dd-dfd are the main mechanisms in the triple transition processes. The transition rate ratio of Yb3+-dimers and Yb3+-trimers in an Yb3+-hexamer is calculated to be ∼1.86×104. This is in reasonable agreement with the experimentally obtained cooperative luminescence intensity ratio of ∼2.0×104 in CaF2:Yb3+ under the excitation of a 980 nm laser.
In CsCdBr3 the trivalent Rare-Earth (RE) ions substitute for the divalent Cd ions. For reasons of charge compensation and the specific crystal structure, RE centers of the form RE3+ - (Cd vacancy) - RE3+ are preferentially formed. These symmetric pair centers are very suitable for studying cooperative effects of RE ions. These include processes between the ions of the pair as well as processes between the coupled pair and the electronic excitations of the host lattice. Experiments will be shown and discussed on: (i) cross relaxation and up-conversion by direct ion-ion interaction; (ii) cooperative cross relaxation of the Pr3+ pairs with the host lattice; and (iii) cooperative vibronic emission of the Pr3+ pairs with high phonon progressions.