HyperDyad · Optimising Energy Transfer in Hyperfluorescence
Horizon Europe — Marie Skłodowska-Curie Actions
- Duration
- 2023-11-01 → 2025-10-31
- EU contribution
- €188,345
- Participants
- 2
- Scheme
- HORIZON-TMA-MSCA-PF-EF
Lines connect the coordinator with its partners.
Results in brief
Optimising Energy Transfer in Hyperfluorescence
Organic light-emitting diodes (OLEDs) represent a key technology for future energy-efficient lighting and displays. However, further improvements in efficiency, colour purity and stability are required, particularly for blue emission. This so-called ‘blue problem’ is a long-standing challenge in OLEDs, with current devices typically requiring a trade-off between efficiency and stability. Hyperfluorescence has emerged as a promising strategy to overcome this challenge by combining two emitters within the emissive layer, each with a separate role. However, current hyperfluorescent OLEDs incorporate these as blended systems, where energy transfer is governed by random intermolecular distances and orientations, limiting reproducibility and performance optimisation. To provide meaningful improvements in hyperfluorescent OLED performance, these interactions must be carefully controlled. The HyperDyad project aimed to demonstrate intramolecular hyperfluorescence by combining the two components within a single molecular architecture – a covalently linked donor–acceptor dyad (HyperDyad). This approach represents a step change in design, transforming hyperfluorescence from a formulation problem into a molecular design paradigm. By removing the random nature of blended systems, HyperDyads offer a pathway toward OLEDs that are predictably both efficient and stable, addressing a critical bottleneck in blue OLED technology with relevance at an industrial and societal scale.
Data: CORDIS, © European Union
Project objective
With an ever-growing population, reducing our demand for energy is a key challenge in building a sustainable future. As part of tackling this problem, Organic Lighting-emitting Diodes (OLEDs) show great potential for application in low-energy consumption displays, lighting, and lasers. OLEDs are increasingly featured in high end consumer electronics; however, their potential is yet to be realised. Undoubtedly, the largest problem OLEDs face today is the instability of the blue emitter. Commercial OLEDs currently employ either an inefficient but stable blue emitter (resulting in energy wastage) or an efficient but unstable blue emitter (resulting in short-lived devices). By splitting the task of energy conversion and emission between two molecules within a device, stable and efficient blue emission is achievable. However, the current approach is to disperse these two molecules within a host, which leads to unpredictable orientations and distances between molecules. This results in detrimental processes within the device that reduce both efficiency and lifetime. Traditionally thought to be a device engineering problem, I propose a step change in thought. In a new approach to molecule design, I aim to tether the molecules together using a rigid bridging unit, forming a ‘dyad’ which gives precise control over the orientation and distances within a device. I aim to explore the efficiency of energy transfer as a function of the bridging unit to develop a structure-function relationship. The results of this work will establish design criteria for dyads which will facilitate the development of both efficient and stable blue emitters.
Original text from CORDIS.
Participants
Links
- View on CORDIS
- DOI: 10.3030/101108406
- https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e50a713df0&appId=PPGMS
- https://ec.europa.eu/research/participants/documents/downloadPublic?documentIds=080166e526c83d1b&appId=PPGMS
Data: CORDIS, © European Union