Abstract
The fluorescence of Cu☎ in RbBr was investigated in the temperature range 20–300 K, by recording both emission and excitation spectra and by performing accurate lifetime and quantum yield measurements. The de-excitation mechanism has been interpreted in terms of the traditional Pedrini model. Nevertheless, a change of the compression conditions for Cu☎ at low temperature was observed, which implies two temperature regions (above and below 40 K) for the decay parameters. This occurrence is related not only to off-centre configuration but also to a very low value for the Cu☎ radius when compared to the Rb☎ one in RbBr.
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