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Novel Organometallic Complexes and Polymers Based Luminescent Materials

English title Novel Organometallic Complexes and Polymers Based Luminescent Materials
Applicant Venkatesan Koushik
Number 156967
Funding scheme Project funding (Div. I-III)
Research institution Institut für Chemie Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Inorganic Chemistry
Start/End 01.02.2015 - 30.11.2019
Approved amount 331'508.00
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All Disciplines (2)

Discipline
Inorganic Chemistry
Organic Chemistry

Keywords (4)

Polymers; Light emitting devices; Organometallic complexes; Luminescence

Lay Summary (German)

Lead
Lichtemittierende Materialien, welche auf organometallischen Komplexen basieren, spielen eine wesentliche Rolle auf dem Gebiet der energieerzeugenden Technologien, insbesondere der Raumbeleuchtung. Obwohl die Forschung zu organischen Leuchtdioden (engl. organic light emitting diodes / OLEDs), elektrochemischen Leuchtzellen (engl. light emitting electrochemical cells / LECs) oder Photovoltaik Systemen auf Hochtouren laufen, fehlen noch immer geeignete Applikationen im tiefblauen/blauen sowie im nahen Infrarot Bereich. Eine kommerzielle Nutzung solcher lichtemittierenden Verbindungen wird durch die schwache Lichtquantenausbeute, die geringe Stabilität und die zu anspruchsvollen Synthesewege enorm erschwert.
Lay summary

Im Rahmen dieses Forschungsprojekt sollen verschiedene Modellansätze und Konzepte angewendet werden, um Substanzen – beispielsweise organometallische Polymere – zu erhalten, welche die oben beschriebenen Nachteile überwinden können. Im Fokus stehen Verbindungen mit Gold oder Platin als Zentralatome, umgeben von elektronisch unterschiedlichen Ligandsystemen. Der Schwerpunkt dieses Projektes liegt sowohl in der Synthese neu designter Produkte wie auch der präzisen Analyse und Interpretation der photophysikalischen Eigenschaften. Ebenfalls sollen neue theoretische Erkenntnisse gewonnen und genutzt werden, um weitere lichtemittierende Materialien zu synthetisieren, welche die gegebenen Anforderungen erfüllen und weit darüber hinausgehen.

Zum einen soll ein besseres Verständnis für fundamentale naturwissenschaftliche Zusammenhänge erhalten und zum anderen, Einfluss auf die Entwicklung dieses Forschungsbereiches genommen werden. Die Resultate sollen den Weg für energieeffiziente Anwendungen in den Technologien der Raumbeleuchtung und Photovoltaik ebnen. Da der Energiehaushalt ein allgegenwärtiges Thema darstellt und nicht ausschliesslich die Schweiz betrifft, soll die gesamte Weltbevölkerung von der breiten Einführung solcher energiefreundlichen Applikationen profitieren können. 

 

Direct link to Lay Summary Last update: 12.03.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Highly Stable and Strongly Emitting N -Heterocyclic Carbene Platinum(II) Biaryl Complexes
Suter Dominik, van Summeren Luuk T. C. G., Blacque Olivier, Venkatesan Koushik (2018), Highly Stable and Strongly Emitting N -Heterocyclic Carbene Platinum(II) Biaryl Complexes, in Inorganic Chemistry, 57(14), 8160-8168.
Stable N-heterocyclic carbene (NHC) cyclometalated (C^C) gold( iii ) complexes as blue–blue green phosphorescence emitters
von Arx Tobias, Szentkuti Alexander, Zehnder Thomas N., Blacque Olivier, Venkatesan Koushik (2017), Stable N-heterocyclic carbene (NHC) cyclometalated (C^C) gold( iii ) complexes as blue–blue green phosphorescence emitters, in Journal of Materials Chemistry C, 5(15), 3765-3769.
Stable N-heterocyclic carbene (NHC) cyclometalated (C^C) gold( iii ) complexes as blue–blue green phosphorescence emitters
von Arx Tobias, Szentkuti Alexander, Zehnder Thomas N., Blacque Olivier, Venkatesan Koushik (2017), Stable N-heterocyclic carbene (NHC) cyclometalated (C^C) gold( iii ) complexes as blue–blue green phosphorescence emitters, in Journal of Materials Chemistry C, 5(15), 3765-3769.
Tunable and Efficient White Light Phosphorescent Emission Based on Single Component N-Heterocyclic Carbene Platinum(II) Complexes
Bachmann Michael, Suter Dominik, Blacque Olivier, Venkatesan Koushik (2016), Tunable and Efficient White Light Phosphorescent Emission Based on Single Component N-Heterocyclic Carbene Platinum(II) Complexes, in Inorganic Chemistry, 55(10), 4733-4745.
Monocyclometalated Gold(III) Complexes Bearing π-Accepting Cyanide Ligands: Syntheses, Structural, Photophysical, and Electrochemical Investigations
Szentkuti Alexander, Garg Jai Anand, Blacque Olivier, Venkatesan Koushik (2015), Monocyclometalated Gold(III) Complexes Bearing π-Accepting Cyanide Ligands: Syntheses, Structural, Photophysical, and Electrochemical Investigations, in Inorganic Chemistry, 54(22), 10748-10760.
Stable and color tunable emission properties based on non-cyclometalated gold( iii ) complexes
Bachmann Michael, Blacque Olivier, Venkatesan Koushik (2015), Stable and color tunable emission properties based on non-cyclometalated gold( iii ) complexes, in Dalton Transactions, 44(21), 10003-10013.

Collaboration

Group / person Country
Types of collaboration
Prof. Trisha Andrew, University of Wisconsin, Madison United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
IC 19 Talk given at a conference Next Generation Gold(III) Luminophores 15.12.2019 Wollongong, Australia Venkatesan Koushik;
AUCAOS 2018 Poster Highly Stable Platinum(II) Triplet Emitters Displaying High Photoluminescent Quantum Efficiencies 02.12.2018 Hahndorf, Australia Suter Dominik;
CECP 18 Talk given at a conference Conceptual Approaches to Blue and White Light Emitting Gold(III) Complexes 04.02.2018 BAd Hofagstein, Austria Venkatesan Koushik;


Associated projects

Number Title Start Funding scheme
135488 Novel Organometallic Complexes and Polymers Based Luminescent Materials 01.02.2012 Project funding (Div. I-III)

Abstract

Light emitting materials based on heavy metal containing organometallic complexes and polymers play a crucial role in applications that involve different fields of technology such as organic light emitting diodes, (OLED), photovoltaic devices, chemical sensors etc. The long-lived (phosphorescence) nature of the emission from the organometallic complexes theoretically allow for 100% harvesting of the excitons. However, several challenging issues remain in regard to their widespread applications such as light emitting efficiencies particularly in the deep blue/blue and near infrared region (NIR), thermal stability for thermal evaporation, solubility in common organic solvents for processability, and device stability during long operational times. Within this framework of the project, various different conceptual approaches are proposed that will be undertaken to the design of novel organometallic complexes and conjugated metallopolymers that are aimed at solving some of these drawbacks. In particular, highly efficient emission properties in the deep blue and near infrared (NIR) range of the electromagnetic spectrum based on small molecule gold(III) and platinum(II) complexes and also conjugated polymers containing gold(I) and platinum(II) moiety will be targeted. The uniquely tailored ligand environments of these metal centers is expected to help to stabilize these resulting complexes in the desired oxidation states and also allow to obtain efficient emission at the desired energies. Several approaches here in proposed will be employed to facilitate significant improvements in luminescence efficiencies along with enabling long-term thermal and photostability for these classes of materials. The specific conception of the various molecular scaffolds are targeted to serve as good model compounds (small molecules) that would favor the immediate generation of polymers with little structural modification. Such an approach provides an added advantage in order to draw close correlation of the observed luminescent properties between the model compounds (small molecules) and the polymers. The research project places a strong emphasis to expand the investigations into the development of new synthetic methodologies, which is a key requirement for preparing the targeted materials with unique structural features that eventually have the desired properties. Extensive photophysical characterization will be carried out to examine the influence arising from the different structural modifications on the properties. Theoretical calculations to gain deep insights into the photophysical behavior and detailed testing and evaluation of the materials in a device (OLED) environment will be pursued. The combination of these different platforms is expected to allow the build-up of several unique classes of light emitting materials suitable for the targeted application and beyond.
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