Photoinduced absorption spectra of different polycarbazolyldiacetylenes in the visible and infrared regions are reported. Long-lived bipolaronic defects, photogenerated by excitation above the band-gap (2.54 eV), are found responsible for the observed signals. Associated with these defects, photogenerated infrared active vibrations (IRAV) are observed as absorption bands or apparent bleachings arising from Fano-type interference. This different behaviour originates from the different degree of overlap of the IRAV modes with the associated low-energy bipolaronic absorption.
LONG-LIVED DEFECTS IN POLYCARBAZOLYLDIACETYLENES. PHOTOINDUCED VIS AND INFRARED SPECTRA
DELLEPIANE, GIOVANNA;CUNIBERTI, CARLA EMILIA;COMORETTO, DAVIDE;MUSSO, GIANFRANCO;PIAGGIO, PAOLO;
1994-01-01
Abstract
Photoinduced absorption spectra of different polycarbazolyldiacetylenes in the visible and infrared regions are reported. Long-lived bipolaronic defects, photogenerated by excitation above the band-gap (2.54 eV), are found responsible for the observed signals. Associated with these defects, photogenerated infrared active vibrations (IRAV) are observed as absorption bands or apparent bleachings arising from Fano-type interference. This different behaviour originates from the different degree of overlap of the IRAV modes with the associated low-energy bipolaronic absorption.
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