Theoretical and experimental investigations on the photoconductivity and nonlinear optical properties of donor acceptor π conjugated copolymer poly 2 5 3 4 ethylenedioxythiophene alt 2 7 9 9 dioctylfluorene Journal Article


Author(s): Narayanan S; Abbas A; Raghunathan S P; Sreekumar, K; Kartha, C.S.; Joseph, R.
Article Title: Theoretical and experimental investigations on the photoconductivity and nonlinear optical properties of donor acceptor π conjugated copolymer poly 2 5 3 4 ethylenedioxythiophene alt 2 7 9 9 dioctylfluorene
Alternate Title: RSC Advances
Journal Title: Unknown
Volume: 5
Issue: 12
Publisher: Kerala Science Congress  
Date Published: 2015
Start Page: 8657
End Page: 8668
DOI/URL:
Notes: --- - "The donor-acceptor (D-A) \xCF\x80 conjugated copolymer, poly(2,5-(3,4-ethylenedioxythiophene)-alt-2,7-(9,9-dioctylfluorene)) (P(EDOT-FL)), a photoconductive and nonlinear optical material has been synthesized via, a direct arylation method using palladium acetate as a catalyst and characterized. The theoretical studies along with photophysical and electrochemical studies confirmed that the copolymer exhibited a relatively lower band gap (2.29 eV) than that of polyfluorene. The photoconductivity properties of the P(EDOT-FL):PC61BM films under various illuminations were studied and high photosensitivity was observed at 488 nm. The field dependence of the photoconductivity in P(EDOT-FL):PC61BM blend films showed that the films could withstand up to 75 V \xCE\xBCm-1 and the photosensitivity at higher electric fields was even greater than two lakh (at 75 V \xCE\xBCm-1, the photosensitivity was 289 742). At higher electric fields, the photocurrent entered into micro ampere ranges. The intensity dependence on the photocurrent in these films was also investigated. Third-order nonlinear optical properties of P(EDOT-FL) under nanosecond laser excitation at 532 nm have been studied by a Z-scan technique. The polymer exhibited a high nonlinear absorption and refraction coefficient. The polymer also showed a good optical limiting response at 532 nm. These results provide an avenue for application of P(EDOT-FL) in photo conducting and nonlinear optical devices." - "<p>Export Date: 11 February 2015</p>"