Subgap absorption in conjugated polymers

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Along with X{sup (3)}, the magnitude of the optical absorption in the transparent window below the principal absorption edge is an important parameter which will ultimately determine the utility of conjugated polymers in active integrated optical devices. With an absorptance sensitivity of < 10{sup {minus}5}, Photothermal Deflection Spectroscopy (PDS) is ideal for determining the absorption coefficients of thin films of transparent'' materials. We have used PDS to measure the optical absorption spectra of the conjugated polymers poly(1,4-phenylene-vinylene) (and derivitives) and polydiacetylene-4BCMU in the spectral region from 0.55 eV to 3 eV. Our spectra show that the shape of the absorption ... continued below

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Sinclair, M.; Seager, C.H. (Sandia National Labs., Albuquerque, NM (USA)); McBranch, D.; Heeger, A.J. (California Univ., Santa Barbara, CA (USA)) & Baker, G.L. (Bell Communications Research, Inc., Red Bank, NJ (USA)) January 1, 1991.

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Along with X{sup (3)}, the magnitude of the optical absorption in the transparent window below the principal absorption edge is an important parameter which will ultimately determine the utility of conjugated polymers in active integrated optical devices. With an absorptance sensitivity of < 10{sup {minus}5}, Photothermal Deflection Spectroscopy (PDS) is ideal for determining the absorption coefficients of thin films of transparent'' materials. We have used PDS to measure the optical absorption spectra of the conjugated polymers poly(1,4-phenylene-vinylene) (and derivitives) and polydiacetylene-4BCMU in the spectral region from 0.55 eV to 3 eV. Our spectra show that the shape of the absorption edge varies considerably from polymer to polymer, with polydiacetylene-4BCMU having the steepest absorption edge. The minimum absorption coefficients measured varied somewhat with sample age and quality, but were typically in the range 1 cm{sup {minus}1} to 10 cm{sup {minus}1}. In the region below 1 eV, overtones of C-H stretching modes were observed, indicating that further improvements in transparency in this spectral region might be achieved via deuteration of fluorination. 11 refs., 4 figs.

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Pages: (6 p)

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OSTI; NTIS; GPO Dep.

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  • Spring meeting of the Materials Research Society (MRS), Anaheim, CA (USA), 29 Apr - 3 May 1991

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  • Other: DE91012655
  • Report No.: SAND-90-3023C
  • Report No.: CONF-910406--10
  • Grant Number: AC04-76DP00789
  • Office of Scientific & Technical Information Report Number: 5883862
  • Archival Resource Key: ark:/67531/metadc1100781

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  • January 1, 1991

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  • Feb. 18, 2018, 3:59 p.m.

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  • May 18, 2018, 4:22 p.m.

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Sinclair, M.; Seager, C.H. (Sandia National Labs., Albuquerque, NM (USA)); McBranch, D.; Heeger, A.J. (California Univ., Santa Barbara, CA (USA)) & Baker, G.L. (Bell Communications Research, Inc., Red Bank, NJ (USA)). Subgap absorption in conjugated polymers, article, January 1, 1991; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc1100781/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.