Abstract
Luminescence line narrowing and hole-burning spectroscopy of Ir(5,6-Me2-phen)2Cl2]+ in glycerol is reported. The homogeneous line width of the electronic origin of the emission is less than 140 MHz at 1.5 K. The Zeeman effect in the resonantly narrowed luminescence spectrum shows the five features typical of the triplet state in an amorphous host. A maximum ZFS of 3±0.5 cm−1 is deduced. From a comparison with the related [Ir(phen)3]3+ complex which shows a maximum ZFS of less than 1 cm−1 we conclude that in Ir(5,6-Me2-phen)2Cl2]+ the close-lying 3MLCT states are responsible for the large ZFS. Modelling of the Zeeman effect of the triplet state in amorphous hosts shows that the Zeeman line narrowing experiments can in principal unravel the ZFS parameters and the spread of ZFSs within the probed isoenergetic luminophores.
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