Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties
Abstract We take advantage of a recent breakthrough in the synthesis of α,β-unfunctionalised 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) moieties, which we symmetrically conjugate with oligothienyls in an unexpectedly stable form, and produce a “metal-free” A-D-A (acceptor-donor-acceptor) ol...
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2017
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oai:doaj.org-article:adbdd5b2bad440cf83b5eecd6a30e08a2021-12-02T15:05:49ZHighly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties10.1038/s41598-017-01785-22045-2322https://doaj.org/article/adbdd5b2bad440cf83b5eecd6a30e08a2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01785-2https://doaj.org/toc/2045-2322Abstract We take advantage of a recent breakthrough in the synthesis of α,β-unfunctionalised 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) moieties, which we symmetrically conjugate with oligothienyls in an unexpectedly stable form, and produce a “metal-free” A-D-A (acceptor-donor-acceptor) oligomer emitting in the near-infrared (NIR) thanks to delocalisation of the BODIPY low-lying lowest unoccupied molecular orbital (LUMO) over the oligothienyl moieties, as confirmed by density functional theory (DFT). We are able to retain a PL efficiency of 20% in the solid state (vs. 30% in dilute solutions) by incorporating such a dye in a wider gap polyfluorene matrix and demonstrate organic light-emitting diodes (OLEDs) emitting at 720 nm. We achieve external quantum efficiencies (EQEs) up to 1.1%, the highest value achieved so far by a “metal-free” NIR-OLED not intentionally benefitting from triplet-triplet annihilation. Our work demonstrates for the first time the promise of A-D-A type dyes for NIR OLEDs applications thereby paving the way for further optimisation.Andrea ZampettiAlessandro MinottoBenedetta Maria SqueoVasilis G. GregoriouSybille AllardUllrich ScherfChristos L. ChochosFranco CacialliNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017) |
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Medicine R Science Q Andrea Zampetti Alessandro Minotto Benedetta Maria Squeo Vasilis G. Gregoriou Sybille Allard Ullrich Scherf Christos L. Chochos Franco Cacialli Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties |
| description |
Abstract We take advantage of a recent breakthrough in the synthesis of α,β-unfunctionalised 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) moieties, which we symmetrically conjugate with oligothienyls in an unexpectedly stable form, and produce a “metal-free” A-D-A (acceptor-donor-acceptor) oligomer emitting in the near-infrared (NIR) thanks to delocalisation of the BODIPY low-lying lowest unoccupied molecular orbital (LUMO) over the oligothienyl moieties, as confirmed by density functional theory (DFT). We are able to retain a PL efficiency of 20% in the solid state (vs. 30% in dilute solutions) by incorporating such a dye in a wider gap polyfluorene matrix and demonstrate organic light-emitting diodes (OLEDs) emitting at 720 nm. We achieve external quantum efficiencies (EQEs) up to 1.1%, the highest value achieved so far by a “metal-free” NIR-OLED not intentionally benefitting from triplet-triplet annihilation. Our work demonstrates for the first time the promise of A-D-A type dyes for NIR OLEDs applications thereby paving the way for further optimisation. |
| format |
article |
| author |
Andrea Zampetti Alessandro Minotto Benedetta Maria Squeo Vasilis G. Gregoriou Sybille Allard Ullrich Scherf Christos L. Chochos Franco Cacialli |
| author_facet |
Andrea Zampetti Alessandro Minotto Benedetta Maria Squeo Vasilis G. Gregoriou Sybille Allard Ullrich Scherf Christos L. Chochos Franco Cacialli |
| author_sort |
Andrea Zampetti |
| title |
Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties |
| title_short |
Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties |
| title_full |
Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties |
| title_fullStr |
Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties |
| title_full_unstemmed |
Highly Efficient Solid-State Near-infrared Organic Light-Emitting Diodes incorporating A-D-A Dyes based on α,β-unsubstituted “BODIPY” Moieties |
| title_sort |
highly efficient solid-state near-infrared organic light-emitting diodes incorporating a-d-a dyes based on α,β-unsubstituted “bodipy” moieties |
| publisher |
Nature Portfolio |
| publishDate |
2017 |
| url |
https://doaj.org/article/adbdd5b2bad440cf83b5eecd6a30e08a |
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