Issue 15, 2022

A porphyrin pentamer as a bright emitter for NIR OLEDs


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.

Graphical abstract: A porphyrin pentamer as a bright emitter for NIR OLEDs

Supplementary files

Article information

Article type
13 Dec 2021
06 Mar 2022
First published
14 Mar 2022
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2022,10, 5929-5933

A porphyrin pentamer as a bright emitter for NIR OLEDs

L. Tejerina, A. G. Rapidis, M. Rickhaus, P. Murto, Z. Genene, E. Wang, A. Minotto, H. L. Anderson and F. Cacialli, J. Mater. Chem. C, 2022, 10, 5929 DOI: 10.1039/D1TC05951C

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