Thermally Activated Delayed Fluorescence Sensitization for Highly Efficient Blue Fluorescent Emitters
AffiliationUniv Arizona, Dept Chem & Biochem
MetadataShow full item record
PublisherJohn Wiley & Sons, Inc.
CitationAbroshan, H., Zhang, Y., Zhang, X., Fuentes‐Hernandez, C., Barlow, S., Coropceanu, V., Marder, S. R., Kippelen, B., Brédas, J.‐L., Thermally Activated Delayed Fluorescence Sensitization for Highly Efficient Blue Fluorescent Emitters. Adv. Funct. Mater. 2020, 2005898. https://doi.org/10.1002/adfm.202005898
JournalAdvanced Functional Materials
Rights© 2020 Wiley‐VCH GmbH.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractHyperfluorescence is emerging as a powerful strategy to develop optoelectronic devices with high‐color purity and enhanced stability. It requires appropriate integration of a sensitizer displaying efficient thermally activated delayed fluorescence (TADF) and an emitter displaying strong, narrow‐band fluorescence. Here, through a joint computational and experimental approach, an unprecedented, end‐to‐end systems level description of the electronic and optical processes that take place in a hyperfluorescent emissive layer composed of a TADF sensitizer, 2,5‐bis(2,6‐di(9H‐carbazol‐9‐yl)phenyl)‐1,3,4‐oxadiazole (4CzDPO), and a fluorescent emitter, 2,5,8,11‐tetra‐tert‐butylperylene (TBPe) is provided. The photophysical properties measurement of the emissive layer is combined with the computational determination of the electronic properties, film morphology, and excitation transfer phenomena. The Förster resonance energy transfer rates from 4CzDPO to TBPe are on the order of 1011 s−1, considerably higher than the radiative and nonradiative recombination rates for 4CzDPO. These features ensure nearly complete energy transfer to TBPe, leading to a five‐fold increase in the photoluminescence quantum yields in the 4CzDPO:TBPe system in comparison to neat films of 4CzDPO. This approach highlights the factors that can provide efficient energy transfer from TADF molecules to fluorescent emitters, suppress energy transfer among TADF molecules, and avoid the need for a host material within the emissive layer.
Note12 month embargo; first published 22 September 2020
VersionFinal accepted manuscript