A porphyrin pentamer as a bright emitter for NIR OLEDs
Artikel i vetenskaplig tidskrift, 2022

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 (lambda > 700 nm), indicating that conjugated porphyrin oligomers are promising emitters for non-toxic NIR OLEDs.

Författare

Lara Tejerina

University of Oxford

Alexandros G. Rapidis

University College London (UCL)

Michel Rickhaus

University of Oxford

Petri Henrik Murto

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

Zewdneh Genene Wolkeba

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

Ergang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

Alessandro Minotto

University College London (UCL)

Harry L. Anderson

University of Oxford

Franco Cacialli

University College London (UCL)

Journal of Materials Chemistry C

2050-7534 (ISSN)

Vol. In Press

Ämneskategorier

Atom- och molekylfysik och optik

Energisystem

Den kondenserade materiens fysik

DOI

10.1039/d1tc05951c

Mer information

Senast uppdaterat

2022-04-12