Project description
New study investigates the mechanism of exciton transfer to quantum dots
Spin-dependent processes play a key role in organic semiconductors, with examples ranging from organic photovoltaics to light-emitting diodes (LEDs). The process of extraction of triplet excitons from organic semiconductors to quantum dots remains largely unexplored. Researchers within the EU-funded TRITON project have demonstrated triplet exciton transfer from molecular acenes to semiconductor nanocrystals. The process allows dark triplet excitons to be converted into photons. The team will now investigate the underlying mechanism controlling the triplet exciton transfer from molecular systems to quantum dot surfaces. Results will prove very useful for improving the efficiency of light generation in LEDs and solar cell systems.
Objective
The generation, control and transfer of triplet excitons in molecular and hybrid systems is of great interest for optoelectronic applications such as light emission, singlet fission, up/down-conversion and photovoltaics. While coupling triplet excitons from inorganic QDs to organic molecules has been well demonstrated, the reverse process, the transfer of triplets from organic semiconductors to QDs is much more challenging and the underlying reasons are still unclear to the field. Recently, the host group has demonstrated that it is possible to transfer triplet excitons from molecular acenes to emissive nanocrystal quantum dots (QDs). This allows the direct conversion of dark triplet excitons to photons in the hybrids. As triplets generation yield through singlet fission in acene molecules can be up to 200%, this discovery opens a new avenue for highly efficient down-conversion. However, the exact factors that govern the transfer, especially the role of interfaces between the two components, remains unknown. The project will build on the host group’s discovery to develop the fundamental science of this new hybrids platform for optoelectronics. Specifically, we will develop a series of highly controlled solution/solid phase systems, where the interfacial conditions of the hybrid will be intentionally modified. The surface ligands, passivation, energy states of the QDs and the distance to the molecules will be precisely controlled. The molecules will also be covalently attached to the QD surface by a range of functional groups. These systems will be studied with steady-state and time-resolved spectroscopies with the aim of elucidating the underlying mechanism controlling the wavefunction overlap and triplet exciton transfer in the hybrids. We will also conduct proof of concept experiments to demonstrate the use of the optimised hybrid materials for down-convertor. These fundamental investigations will open up new possibilities for down-conversion and optoelectronics.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences condensed matter physics quasiparticles
- natural sciences physical sciences electromagnetism and electronics optoelectronics
- natural sciences physical sciences electromagnetism and electronics semiconductivity
- natural sciences physical sciences theoretical physics particle physics photons
- natural sciences physical sciences optics spectroscopy
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Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions
MAIN PROGRAMME
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H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility
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Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
MSCA-IF-EF-ST - Standard EF
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Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) H2020-MSCA-IF-2018
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
CB2 1TN CAMBRIDGE
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.