Relation between the thermal activation energy of conduction and the first excited singlet state energy-a case of photo-conducting organic materials

The thermal activation energy of dark conductivity has been measured for a new series of cationic cyanine dyes (seven in numbers) derived from different heterocyclic nuclei. The thin layers of the dyes were obtained by vacuum deposition on a surface type raster cell in a vacuum of the order of 10−4 Torr. The results concerning the nature of charge transport have been discussed. A relationship between the thermal activation energy (ΔED) and the first excited singlet state energy of the molecules (1E) has also been attempted.