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Journal Article

Spin-polarisation effects in luminescence


Schulz,  Hans-Joachim
Fritz Haber Institute, Max Planck Society;

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Schulz, H.-J. (1991). Spin-polarisation effects in luminescence. Journal of Luminescence, 48-49(2), 675-679. doi:10.1016/0022-2313(91)90217-J.

Cite as: https://hdl.handle.net/21.11116/0000-0009-6BFA-6
A model of one-electron states is devised to describe within the strong-field limit the chromium states Cr2+(d4) and Cr+(d5) in tetrahedral crystal fields. The proposed advancement is the inclusion of spin-correlation effects, i.e. a differentiation between the energies of spin-up and spin-down electron configurations. The method comprises the known spin-allowed 5E(D)⇆5T2(D) transitions of Cr2+ and, above all, spin-forbidden transitions. The 4T1(G)→6A1(S) luminescence of ZnSe:Cr+ peaking near v=10 300cm-1 is interpreted as a t2↓→e transition of the d5 configuration. A weak emission band of ZnSe:Cr peaking near 6100 cm at cryo-temperatures and its analogues in ZnS and other II–VI materials are now assigned to the t2↑t2↓e2→t2↑2e2 spin-flip process of the Cr2+ (d4) configuration whose Jahn-Teller-stabilised ground state had earlier been proved to participate in this luminescence. The described emission bands provide for the first time direct means to derive from an experiment the spin-flip energy within the one-electron limit.