Title

Donor-Acceptor-Donor-based pi-Conjugated Oligomers for Nonlinear Optics and Near-IR Emission

Authors

Authors

S. Ellinger; K. R. Graham; P. J. Shi; R. T. Farley; T. T. Steckler; R. N. Brookins; P. Taranekar; J. G. Mei; L. A. Padilha; T. R. Ensley; H. H. Hu; S. Webster; D. J. Hagan; E. W. Van Stryland; K. S. Schanze;J. R. Reynolds

Comments

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Abbreviated Journal Title

Chem. Mat.

Keywords

near-infrared emission; PLED; two-photon absorption; donor-acceptor; oligomers; controlled HOMO-LUMO gap; EXCITED-STATE ABSORPTION; FIELD-EFFECT TRANSISTORS; FRANCK-CONDON; FACTORS; BAND-GAP; 2-PHOTON ABSORPTION; PHOTOPHYSICAL PROPERTIES; POLYMETHINE DYES; CHARGE-TRANSFER; CROSS-SECTIONS; SINGLE-BEAM; Chemistry, Physical; Materials Science, Multidisciplinary

Abstract

A family of multi-heterocycle donor acceptor donor (DAD) telechelic conjugated oligomers designed for two-photon absorption (2PA) and emission in the near-infrared (near-IR) were prepared, and the relationship between their spectral, structural, and electrochemical properties were investigated. These oligomers, based on electron-rich thiophene, phenylene, and 3,4-ethylenedioxythiophene (EDOT) units as donors along with electron-deficient benzothiadiazole or its derivative units as acceptors, have been characterized through linear absorbance and fluorescence measurements, nonlinear absorbance, cyclic voltammetry, and differential pulse voltammetry to demonstrate the evolution of narrow HOMO-LUMO gaps ranging from 1.05 to 1.95 eV, with the oligomers composed of EDOT and benzo[1,2-c,3,4-c']bis[1,2,5]thiadiazole (BBT) exhibiting the narrowest gap. The absorption maxima ranges from 517 to 846 nm and the fluorescence maxima ranges from 651 to 1088 nm for the different oligomers. Z-scan and two-photon fluorescence were used to measure the frequency degenerate 2PA of the different oligomers. The oligomer's 2PA cross sections ranged from 900-3500 GM, with the oligomer containing EDOT donor units and a BBT acceptor unit exhibiting the largest 2PA cross section. The use of these oligomers in red to near-IR emitting polymer light-emitting diodes (PLEDs) was demonstrated by blending the soluble emitting oligomers into a suitable host matrix. Energy transfer from the matrix to the emitting oligomer can be achieved, resulting in PLEDs with pure oligomer emission.

Journal Title

Chemistry of Materials

Volume

23

Issue/Number

17

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

3805

Last Page

3817

WOS Identifier

WOS:000294647700003

ISSN

0897-4756

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