Issue 5, 2023

High-efficiency and stable red to near-infrared organic light-emitting diodes using dinuclear platinum(ii) complexes

Abstract

Increasing the radiative decay rates of triplet excited states to overcome the energy-gap law is important for the development of high-efficiency and short-lived phosphorescent metal complexes in the red to near-infrared (NIR) region. Herein, a series of robust dinuclear Pt(II) complexes featuring strong intramolecular noncovalent Pt–Pt and π–π interactions has been developed by using N-deprotonated α-carboline as the bridging ligands. Combined crystallography, electrochemical and computational studies reveal their rigid structures and triplet metal–metal-to-ligand charge transfer (3MMLCT) excited states. The new complexes exhibit efficient red to NIR phosphorescence with excited lifetimes shorter than 2 μs. Organic light-emitting diodes (OLEDs) doped with these complexes show high maximum external quantum efficiencies (EQEs) up to 26.4% (λmax = 615 nm) and 10.8% for red and NIR (λmax = 740 nm) devices, respectively, which are among the best devices doped with discrete Pt(II) complexes. Both the red and NIR devices also show small efficiency roll-offs at high brightness. Appealing operational lifetimes have also been revealed which promise their practicality.

Graphical abstract: High-efficiency and stable red to near-infrared organic light-emitting diodes using dinuclear platinum(ii) complexes

Supplementary files

Article information

Article type
Research Article
Submitted
12 noy 2022
Accepted
30 yan 2023
First published
01 fev 2023

Mater. Chem. Front., 2023,7, 873-880

High-efficiency and stable red to near-infrared organic light-emitting diodes using dinuclear platinum(II) complexes

L. Wang, Z. Wen, Y. Xu, Y. Zhang, J. Miao, Z. Chen and K. Li, Mater. Chem. Front., 2023, 7, 873 DOI: 10.1039/D2QM01163H

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