Cited by 93Organic Electronics and PhotovoltaicsOrganic Light-Emitting Diodes ResearchPhotochemistry and Electron Transfer Studies

Ultranarrow Bandwidth Organic Photodiodes by Exchange Narrowing in Merocyanine H‐ and J‐Aggregate Excitonic Systems

Liess, Andreas, Arjona‐Esteban, Alhama, Kudzus, Astrid, Albert, Julius, Krause, Ana‐Maria, Lv, Aifeng, Stolte, Matthias, Meerholz, Klaus +1 more·2019·Advanced Functional Materials

Abstract

Ultranarrowband organic photodiodes (OPDs) are demonstrated for thin film solid state materials composed of tightly packed dipolar merocyanine dyes. For these dyes the packing arrangement can be controlled by the bulkiness of the donor substituent, leading to either strong H‐ or strong J‐type exciton coupling in the interesting blue (H‐aggregate) and NIR (J‐aggregate) spectral ranges. Both bands are shown to arise from one single exciton band according to fluorescence measurements and are not just a mere consequence of different polymorphs within the same thin film. By fabrication of organic thin‐film transistors, these dyes are demonstrated to exhibit hole transport behavior in spin‐coated thin films. Moreover, when used as organic photodiodes in planar heterojunctions with C 60 fullerene, they show wavelength‐selective photocurrents in the solid state with maximum external quantum efficiencies of up to 11% and ultranarrow bandwidths down to 30 nm. Thereby, narrowing the linewidths of optoelectronic functional materials by exciton coupling provides a powerful approach to produce ultranarrowband organic photodiodes.

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Crossref · 10.1002/adfm.201805058

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Authors
Liess, A., Arjona‐Esteban, A., Kudzus, A., Albert, J., Krause, A., Lv, A., Stolte, M., Meerholz, K., & Würthner, F.
Affiliations
  • University of Würzburg (DE)
  • University of Cologne (DE)
Corresponding author
Würthner, Frank
Venue
Advanced Functional Materials
Publisher
Wiley
Published
2018-09-21
Volume
29
Issue
21
ISSN
  • 1616-301X (ISSN-L)
  • 1616-3028
OpenAlex
W2892569190
Cited by
93
References
65
Citations by year
2026: 8 · 2025: 10 · 2024: 15 · 2023: 19 · 2022: 11 · 2021: 18 · 2020: 10 · 2019: 2
FWCI
2.87
Type
journal article
Language
en
Open access
closed
Locations
  • Advanced Functional Materials (publishedVersion)
  • Kölner Universitäts PublikationsServer (Universität zu Köln) (publishedVersion)
Funders
Bayerisches Staatsministerium für Wissenschaft und Kunst
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Electronics and Photovoltaics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
Keywords
organic photodiodes, exchange narrowing, merocyanine dyes, H-aggregates, J-aggregates, exciton coupling, organic thin-film transistors, hole transport, external quantum efficiency

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