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Electrical conductivity and luminescence of 9-chloro-10,10′-bis-(dichloromethyleno)-(9′H)-10,10′-dihydro-9,9′-bianthryl (CDDB)
A K Chattopadhyay S Basu S Das N B Palit S C Chakraborty
Volume 16 Issue 4 August 1993 pp 287-296
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https://www.ias.ac.in/article/fulltext/boms/016/04/0287-0296 -
Keywords
Bichromophoric molecule ;dual fluorescence ;twisted intramolecular charge transfer ;dark and photoelectrical conductivities -
Abstract
The absorption and fluorescenc of 9-chloro-10,10′-bis-(dichloromethyleno)-(9′H)-10,10′-dihydro-9,9′-bianthryl (CDDB) has been studied in polar and nonpolar solvents and also in microcrystal. In polar solvents CDDB emits from two molecular forms, the normal charge transfer form (locally excited, LE form) and the solvent-induced twisted intramolecular charge transfer (TICT) form. Electrically, CDDB possesses semiconducting property with conductivity approximately 10−9 S cm−1 and this conductivity further increases to 10−7 S cm−1 on photoexcitation. Intramolecular charge transfer by hopping mechanism is assumed to be the main process for controlling activation energy and electronic conduction.
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Author Affiliations
A K Chattopadhyay1 S Basu1 S Das1 N B Palit1 S C Chakraborty1
- Solid State Physics Laboratory, Jadavpur University, Calcutta - 700 032, India
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Dates
- Published
- August 1993
- Manuscript received
- 20 February 1993
- Manuscript revised
- 14 June 1993
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