Temperature-dependence measurements of the luminescence spectra, the decay times and the luminescence intensities of some Cu' complexes are reported. The results are interpreted in terms of a three-level scheme. The lifetimes of these complexes vary considerably due to the differences in quantum efficiencies of the complexes. The charge-transfer character of the transitions involved is confirmed. E X P E R I M E N T A LCur complexes were prepared and characterized by the methods described previ~usly.'.'~ We found no significant variation of the luminescence properties of the complexes due to 595

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The 5D3–5D4 cross relaxation process of Tb3+ in CsCdBr3 has been evaluated by analysis of the decay curves of the 5D3 and 5D4 emission. The temperature dependence of the cross relaxation rate can be explained assuming phonon-assisted processes. The results show that the larger amount of Tb3+ ions is incorporated in pairs into the CsCdBr3 lattice.

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