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Proceedings Paper

Electronic and optical properties of novel carbazole-based donor-acceptor compounds for applications in blue-emitting organic light-emitting diodes
Author(s): Christian M. Legaspi; Regan E. Stubbs; David J. Yaron; Linda A. Peteanu; Matthew Y. Sfeir; Abraham Kemboi; Jesse Picker; Eric Fossum
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Paper Abstract

Organic light-emitting diodes (OLEDs) have received a significant attention over the past decade due to their energy-saving potential. We have recently synthesized two novel carbazole-based donor-acceptor compounds and analyzed their optical properties to determine their suitability for use as blue emitters in OLEDs. These compounds show remarkable photo-stability and high quantum yields in the blue region of the spectrum. In addition, they have highly solvatochromic emission. In non-polar solvents, bright, blue-shifted (λmax ≈ 398 nm), and highly structured emission is seen. With increasing solvent dielectric constant, the emission becomes weaker, red-shifted (λmax ≈ 507 nm), and broad. We aim to determine the underlying cause of these changes. Electronic structure calculations indicate the presence of multiple excited states with comparable oscillator strength. These states are of interest because there are several with charge-transfer (CT) character, and others centered on the donor moiety. We theorize that CT states play a role in the observed changes in emission lineshape and may promote charge mobility for electrofluorescence in OLEDs. In the future, we plan to use Stark spectroscopy to analyze the polarity of excited states and transient absorption spectroscopy to observe the dynamics in the excited state.

Paper Details

Date Published: 20 August 2015
PDF: 6 pages
Proc. SPIE 9549, Physical Chemistry of Interfaces and Nanomaterials XIV, 95491M (20 August 2015); doi: 10.1117/12.2188634
Show Author Affiliations
Christian M. Legaspi, Carnegie Mellon Univ. (United States)
Regan E. Stubbs, Carnegie Mellon Univ. (United States)
David J. Yaron, Carnegie Mellon Univ. (United States)
Linda A. Peteanu, Carnegie Mellon Univ. (United States)
Matthew Y. Sfeir, Brookhaven National Lab. (United States)
Abraham Kemboi, Wright State Univ. (United States)
Jesse Picker, Wright State Univ. (United States)
Eric Fossum, Wright State Univ. (United States)

Published in SPIE Proceedings Vol. 9549:
Physical Chemistry of Interfaces and Nanomaterials XIV
Sophia C. Hayes; Eric R. Bittner, Editor(s)

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