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Title: Subgap absorption in conjugated polymers

Abstract

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.

Authors:
;  [1]; ;  [2];  [3]
  1. (Sandia National Labs., Albuquerque, NM (USA))
  2. (California Univ., Santa Barbara, CA (USA))
  3. (Bell Communications Research, Inc., Red Bank, NJ (USA))
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (USA)
OSTI Identifier:
5883862
Report Number(s):
SAND-90-3023C; CONF-910406-10
ON: DE91012655
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: Spring meeting of the Materials Research Society (MRS), Anaheim, CA (USA), 29 Apr - 3 May 1991
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; POLYMERS; OPTICAL PROPERTIES; ABSORPTION; ACETYLENE; SPECTROSCOPY; ALKYNES; HYDROCARBONS; ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; 360603* - Materials- Properties

Citation Formats

Sinclair, M., Seager, C.H., McBranch, D., Heeger, A.J., and Baker, G.L. Subgap absorption in conjugated polymers. United States: N. p., 1991. Web.
Sinclair, M., Seager, C.H., McBranch, D., Heeger, A.J., & Baker, G.L. Subgap absorption in conjugated polymers. United States.
Sinclair, M., Seager, C.H., McBranch, D., Heeger, A.J., and Baker, G.L. Tue . "Subgap absorption in conjugated polymers". United States. doi:. https://www.osti.gov/servlets/purl/5883862.
@article{osti_5883862,
title = {Subgap absorption in conjugated polymers},
author = {Sinclair, M. and Seager, C.H. and McBranch, D. and Heeger, A.J. and Baker, G.L.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}

Conference:
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