Descripción del proyecto
Materiales fluorescentes mejorados para la tecnología de diodos orgánicos emisores de luz de próxima generación
La fluorescencia suele implicar la conversión de luz a longitudes de onda más cortas en luz a longitudes de onda más largas. Ciertos materiales fluorescentes presentan fluorescencia retardada activada térmicamente (TADF, por sus siglas en inglés), un mecanismo que mejora la eficacia de los diodos orgánicos emisores de luz (OLED, por sus siglas en inglés) y de la imagenología de fluorescencia. A pesar de sus beneficios, aún no se comprende bien este mecanismo. Además, los materiales fluorescentes que presentan TADF son sensibles a los cambios estructurales. Financiado por las Acciones Marie Skłodowska-Curie, el equipo del proyecto MEGA probará y sintetizará los compuestos TADF más prometedores, preparará materiales de muestra de pureza muy alta y prolongará la vida útil de los emisores de TADF para que puedan cumplir los requisitos de la industria.
Objetivo
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
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MSCA-RISE - Marie Skłodowska-Curie Research and Innovation Staff Exchange (RISE)Coordinador
LT-44029 Kaunas
Lituania