Abstract
Luminescence from relaxed excitons associated with guest halogen dimers was investigated for KBr:I and KCl:Br through time-resolved measurements of emission and excitation spectra using synchrotron radiation pulses from UVSOR under single-bunch operation. A weak slow decay component was found in addition to a main fast one in the 4.89 eV band in KCl:Br, in contrast to the 4.35 eV band of KBr:I which consists of a weak fast decay component and a main slow one. The fast and the slow decay components are assigned to transition from the singlet and the triplet relaxed excitons in the on-center configuration. It is suggested that the adiabatic potential energy surface for the triplet state, as well as that for the singlet state, must have a local minimum at the on-center configuration but that the triplet exciton in KCl:Br relaxes preferentially into the off-center configuration.
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