EU Project MSCA IF - H2020 - LEFKO - PHOS Binuclear Iridium(III) Complexes for White-Emitting OLEDs -- (DCM.AD006.140)

Thematic area

Chemical sciences and materials technology

Project area

Structure responsible for the research project

Institute for organic syntheses and photoreactivity (ISOF)

Project manager

ROBERTO ZAMBONI
Phone number: 0516399770
Email: direzione@isof.cnr.it

Abstract

The European Union set the ambitious target of increasing energy efficiency by 27% within 2030. Since H 20% of the EU electrical energy is used for lighting, more efficient lighting concepts need to be developed. At present, LEDs are the best alternative for lighting devices, but organic LEDs (OLEDs) are predicted to become the ultimate solution, since they allow fabrication of large-area flat and flexible devices; consequently, white-emitting OLEDs (WOLEDs) are actively investigated.
Current WOLEDs require the use of multiple luminophores in a single device, leading to imbalanced white-light emission, colour instability and high costs. To overcome these drawbacks, attempts have been made to generate white-emission from a single material. However, strong limitations were faced due to complex syntheses, inability to control energy-transfer processes.
We propose a new strategy for easy-to-synthesize binuclear cyclometalated iridium(III) complexes, displaying dual-emission for white-light generation from a single molecular entity, with the simultaneous generation of blue and orange emission from two electronically uncoupled centres, linked together by a non-conjugated bridge.

Goals

The main scientific objective of Lefko-Pho is the development of white-light emissive materials that are highly efficient, thermally, photochemically and electrochemically stable, and ultimately suitable for the development of WOLEDs. The target materials are binuclear cyclometalated Ir(III) complexes, whose emitting units are linked by a non-conjugated bridging ligand.
The main objective will be reached through a series of intermediate specific scientific objectives (SOs):
SO-a. Synthesis and characterization of bridging ligands to develop binuclear Ir(III) complexes.
SO-b. Synthesis and characterization of mononuclear bluish-green and orange-red model Ir(III) complexes.
SO-c. Synthesis and characterization of white-light emitting binuclear Ir(III) assemblies.
SO-d. Fabrication and optoelectronic characterization of white-emitting OLEDs.

Start date of activity

01/01/2020

Keywords

Photochemistry, Theoretical and computational chemistry, Organometallic chemistry

Last update: 07/08/2025