Description du projet
Matériaux fluorescents améliorés pour la technologie OLED de nouvelle génération
La fluorescence implique généralement la conversion d’une lumière de courte longueur d’onde en une lumière de plus grande longueur d’onde. Certains matériaux fluorescents sont caractérisés par une fluorescence retardée activée thermiquement (TADF pour «thermally activated delayed fluorescence»), un mécanisme qui améliore l’efficacité des diodes électroluminescentes organiques (OLED) et de l’imagerie par fluorescence. En dépit de ses avantages, ce mécanisme est encore trop peu compris. Qui plus est, les matériaux fluorescents qui présentent une TADF sont sensibles aux changements structurels. Financé par le programme Actions Marie Skłodowska-Curie, le projet MEGA permettra de cribler et de synthétiser les composés TADF les plus prometteurs, de préparer des échantillons de très haute pureté et d’augmenter la durée de vie des émetteurs TADF afin qu’ils puissent répondre aux exigences de l’industrie.
Objectif
Organic heavy metal free fluorescent materials show exceptional potential for use in new-generation light sources, such as organic light-emitting devices (OLEDs) and organic lasers. It is anticipated that these new materials will enable organic electronic devices to be constructed with higher efficiency, simpler device structures, lower fabrication costs, and reduced environmental impact.
Amongst the different types of materials currently being investigated, two show particular promise:
• Fluorescence materials exhibiting thermally activated delayed fluorescence (TADF) for use in OLEDs in displays and lighting devices .
• Fluorescent materials with low thresholds for amplified spontaneous emission (ASE) for use in organic lasers in spectroscopy and telecommunication .
However, in order to develop these materials for commercial industrial use, several challenges still remain to be overcome, including:
• Theories explaining TADF and ASE are still in their infancy.
• Organic material samples need to be extremely pure (>99.5%). Consequently, new synthesis routes need to be developed.
• TADF emitters for OLEDs have lifetimes that fall well short of industry requirements.
• Fluorescence emitters for lasers need high available optical gain, solution processability and narrow emission spectra with high efficiency.
• Properties of TADF and lasing materials are very sensitive to structural changes.
Thus, the overall goal of the MEGA project is to help develop organic heavy metal free fluorescent materials for commercial use by tackling these challenges. In order to develop the new materials, the following S&T objectives will be targeted:
• Objective 1: Screen compounds with TADF or lasing properties by means of molecular modelling
• Objective 2: Synthesise most promising compounds with TADF or lasing properties
• Objective 3: Characterise most promising compounds with TADF or lasing properties
• Objective 4: Test materials in device structures to meet industry requirement
Champ scientifique
Mots‑clés
Programme(s)
Régime de financement
MSCA-RISE - Marie Skłodowska-Curie Research and Innovation Staff Exchange (RISE)Coordinateur
LT-44029 Kaunas
Lituanie