Thermally Assisted Fluorescent Polymers: Polycyclic Aromatic Materials for High Color Purity and White-Light Emission
| Autor: | Zachary M. Hudson, Nathan R. Paisley, Cheyenne J. Christopherson, Annelie C. Reyes, Alexander M. Polgar, Christopher M. Tonge |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Förster resonance energy transfer chemistry Color purity High color White light General Materials Science Fluorescent polymer 0210 nano-technology Common emitter |
| Zdroj: | ACS Applied Materials & Interfaces. 12:38602-38613 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Thermally activated delayed fluorescence (TADF) sensitization of fluorescence is a promising strategy to improve the color purity and operational lifetime of conventional TADF organic light-emitting diodes (OLEDs). Here, we propose a new design strategy for TADF-sensitized fluorescence based on acrylic polymers with a pendant energy-harvesting host, a TADF sensitizer, and fluorescent emitter monomers. Fluorescent emitters were rationally designed from a series of homologous polycyclic aromatic amines, resulting in efficient and color-pure polymeric fluorophores capable of harvesting both singlet and triplet excitons. Macromolecular analogues of blue, green, and yellow fourth-generation OLED emissive layers were prepared in a facile manner by Cu(0) reversible deactivation radical polymerization, with emission quantum yields up to 0.83 in air and narrow emission bands with full width at half-maximum as low as 57 nm. White-light emission can easily be achieved by enforcing incomplete energy transfer between a deep blue TADF sensitizer and yellow fluorophore to yield a single white-emissive polymer with CIE coordinates (0.33, 0.39) and quantum yield 0.77. Energy transfer to the fluorescent emitters occurs at rates of 1-4 × 10 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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