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A porphyrin pentamer as a bright emitter for NIR OLEDs


Tejerina, Lara; Rapidis, Alexandros G; Rickhaus, Michel; Murto, Petri; Genene, Zewdneh; Wang, Ergang; Minotto, Alessandro; Anderson, Harry L; Cacialli, Franco (2022). A porphyrin pentamer as a bright emitter for NIR OLEDs. Journal of Materials Chemistry C, 10(15):5929-5933.

Abstract

The luminescence and electroluminescence of an ethyne-linked zinc(ii) porphyrin pentamer have been investigated, by testing blends in two different conjugated polymer matrices, at a range of concentrations. The best results were obtained for blends with the conjugated polymer PIDT-2TPD, at a porphyrin loading of 1 wt%. This host matrix was selected because the excellent overlap between its emission spectrum and the low-energy region of the absorption spectrum of the porphyrin oligomer leads to efficient energy transfer. Thin films of this blend exhibit intense fluorescence in the near-infrared (NIR), with a peak emission wavelength of 886 nm and a photoluminescent quantum yield (PLQY) of 27% in the solid state. Light-emitting diodes (LEDs) fabricated with this blend as the emissive layer achieve average external quantum efficiencies (EQE) of 2.0% with peak emission at 830 nm and a turn-on voltage of 1.6 V. This performance is remarkable for a singlet NIR-emitter; 93% of the photons are emitted in the NIR (λ > 700 nm), indicating that conjugated porphyrin oligomers are promising emitters for non-toxic NIR OLEDs.

Abstract

The luminescence and electroluminescence of an ethyne-linked zinc(ii) porphyrin pentamer have been investigated, by testing blends in two different conjugated polymer matrices, at a range of concentrations. The best results were obtained for blends with the conjugated polymer PIDT-2TPD, at a porphyrin loading of 1 wt%. This host matrix was selected because the excellent overlap between its emission spectrum and the low-energy region of the absorption spectrum of the porphyrin oligomer leads to efficient energy transfer. Thin films of this blend exhibit intense fluorescence in the near-infrared (NIR), with a peak emission wavelength of 886 nm and a photoluminescent quantum yield (PLQY) of 27% in the solid state. Light-emitting diodes (LEDs) fabricated with this blend as the emissive layer achieve average external quantum efficiencies (EQE) of 2.0% with peak emission at 830 nm and a turn-on voltage of 1.6 V. This performance is remarkable for a singlet NIR-emitter; 93% of the photons are emitted in the NIR (λ > 700 nm), indicating that conjugated porphyrin oligomers are promising emitters for non-toxic NIR OLEDs.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > General Chemistry
Physical Sciences > Materials Chemistry
Uncontrolled Keywords:Materials Chemistry, General Chemistry
Language:English
Date:1 January 2022
Deposited On:09 Jan 2023 09:50
Last Modified:28 Jun 2024 01:37
Publisher:Royal Society of Chemistry
ISSN:2050-7526
OA Status:Hybrid
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1039/d1tc05951c
PubMed ID:35517642
Project Information:
  • : FunderH2020
  • : Grant ID643238
  • : Project TitleSYNCHRONICS - SupramolecularlY eNgineered arCHitectures for optoelectRonics and photONICS: a multi-site initial training action
  • : FunderEPSRC
  • : Grant IDEP/P006280/1
  • : Project Title
  • : FunderSwiss National Science Foundation
  • : Grant IDP2BSP2_168919
  • : Project Title
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)