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1. Experimental Demonstration of Staggered CAP Modulation for Low Bandwidth Red-Emitting Polymer-LED based Visible Light Communications

Author

Haigh, Paul Anthony, Minotto, Alessandro, Burton, Andrew, Ghassemlooy, Zabih, Murto, Petri, Genene, Zewdneh, Mammo, Wendimagegn, Andersson, Mats R., Wang, Ergang, Cacialli, Franco, and Darwazeh, Izzat

Subjects
Computer Science - Networking and Internet Architecture, Electrical Engineering and Systems Science - Signal Processing, Physics - Applied Physics
Abstract

In this paper we experimentally demonstrate, for the first time, staggered carrier-less amplitude and phase (sCAP) modulation for visible light communication systems based on polymer light-emitting diodes emitting at ~639 nm. The key advantage offered by sCAP in comparison to conventional multiband CAP is its full use of the available spectrum. In this work, we compare sCAP, which utilises four orthogonal filters to generate the signal, with a conventional 4-band multi-CAP system and on-off keying (OOK). We transmit each modulation format with equal energy and present a record un-coded transmission speed of ~6 Mb/s. This represents gains of 25% and 65% over the achievable rate using 4-CAP and OOK, respectively., Comment: 6 pages, 9 figures, IEEE ICC 2019 conference

Published
2019

17. A porphyrin pentamer as a bright emitter for NIR OLEDs

Author

Tejerina, Lara, Rapidis, Alexandros G, Rickhaus, Michel, Murto, Petri, Genene, Zewdneh, Wang, Ergang, Minotto, Alessandro, Anderson, Harry L, Cacialli, Franco, Tejerina, L, Rapidis, A, Rickhaus, M, Murto, P, Genene, Z, Wang, E, Minotto, A, Anderson, H, Cacialli, F, University of Zurich, Anderson, Harry L, and Cacialli, Franco

Subjects
10120 Department of Chemistry, Porphyrin, Near-infrared, OLED, 540 Chemistry, Materials Chemistry, 1600 General Chemistry, General Chemistry, 7. Clean energy, 2505 Materials Chemistry
Abstract

The luminescence and electroluminescence of an ethyne-linked zinc(ii) porphyrin pentamer have been investigated, by testing blends in two different conjugated polymer matrices, at a range of concentrations. The best results were obtained for blends with the conjugated polymer PIDT-2TPD, at a porphyrin loading of 1 wt%. This host matrix was selected because the excellent overlap between its emission spectrum and the low-energy region of the absorption spectrum of the porphyrin oligomer leads to efficient energy transfer. Thin films of this blend exhibit intense fluorescence in the near-infrared (NIR), with a peak emission wavelength of 886 nm and a photoluminescent quantum yield (PLQY) of 27% in the solid state. Light-emitting diodes (LEDs) fabricated with this blend as the emissive layer achieve average external quantum efficiencies (EQE) of 2.0% with peak emission at 830 nm and a turn-on voltage of 1.6 V. This performance is remarkable for a singlet NIR-emitter; 93% of the photons are emitted in the NIR (λ > 700 nm), indicating that conjugated porphyrin oligomers are promising emitters for non-toxic NIR OLEDs.

Published
2022
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18. Nanoscale Photoluminescence Manipulation in Monolithic Porous Silicon Oxide Microcavity Coated with Fluorescent Polyelectrolytes Via Electrostatic Nanoassembling

Author

Chen, Zhi, primary, Robbiano, Valentina, additional, Paternò, Giuseppe M, additional, Carnicella, Giseppe, additional, Debrassi, Aline, additional, La Mattina, Antonino A., additional, Mariani, Stefano, additional, Minotto, Alessandro, additional, Egri, Gabriella, additional, Daehne, Lars, additional, Cacialli, Franco, additional, and Barillaro, Giuseppe, additional

Published
2022
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25. Preface

Author

Cacialli, Franco, Anderson, Harry L., and Friend, Richard H.

Published
2007
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26. A porphyrin pentamer as a bright emitter for NIR OLEDs

Author

Tejerina, Lara, primary, Rapidis, Alexandros G., additional, Rickhaus, Michel, additional, Murto, Petri, additional, Genene, Zewdneh, additional, Wang, Ergang, additional, Minotto, Alessandro, additional, Anderson, Harry L., additional, and Cacialli, Franco, additional

Published
2022
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28. Biomimetic Approaches to "Transparent" Photovoltaics: Current and Future Applications.

Author

Pompilio, Michele, Ierides, Ioannis, and Cacialli, Franco

Subjects
PHOTOVOLTAIC power generation, ELECTROCHROMIC windows, PHOTOVOLTAIC cells
Abstract

There has been a surge in the interest for (semi)transparent photovoltaics (sTPVs) in recent years, since the more traditional, opaque, devices are not ideally suited for a variety of innovative applications spanning from smart and self-powered windows for buildings to those for vehicle integration. Additional requirements for these photovoltaic applications are a high conversion efficiency (despite the necessary compromise to achieve a degree of transparency) and an aesthetically pleasing design. One potential realm to explore in the attempt to meet such challenges is the biological world, where evolution has led to highly efficient and fascinating light-management structures. In this mini-review, we explore some of the biomimetic approaches that can be used to improve both transparent and semi-transparent photovoltaic cells, such as moth-eye inspired structures for improved performance and stability or tunable, coloured, and semi-transparent devices inspired by beetles' cuticles. Lastly, we briefly discuss possible future developments for bio-inspired and potentially bio-compatible sTPVs. [ABSTRACT FROM AUTHOR]

Published
2023
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30. A Porphyrin Pentamer as a Bright Emitter for NIR OLEDs

Author

Tejerina, Lara, primary, Rapidis, Alexandros, additional, Rickhaus, Michel, additional, Murto, Petri, additional, Genene, Zewdneh, additional, Wang, Ergang, additional, Minotto, Alessandro, additional, Anderson, Harry, additional, and Cacialli, Franco, additional

Published
2021
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32. Molecular Encapsulation of Naphthalene Diimide (NDI) Based π‐Conjugated Polymers: A Tool for Understanding Photoluminescence

Author

Royakkers, Jeroen, primary, Guo, Kunping, additional, Toolan, Daniel T. W., additional, Feng, Liang‐Wen, additional, Minotto, Alessandro, additional, Congrave, Daniel G., additional, Danowska, Magda, additional, Zeng, Weixuan, additional, Bond, Andrew D., additional, Al‐Hashimi, Mohammed, additional, Marks, Tobin J., additional, Facchetti, Antonio, additional, Cacialli, Franco, additional, and Bronstein, Hugo, additional

Published
2021
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35. Nanoscale Photoluminescence Manipulation in Monolithic Porous Silicon Oxide Microcavity Coated with Rhodamine‐Labeled Polyelectrolyte via Electrostatic Nanoassembling

Author

Chen, Zhi, primary, Robbiano, Valentina, additional, Paternò, Giuseppe M., additional, Carnicella, Giuseppe, additional, Debrassi, Aline, additional, La Mattina, Antonino A., additional, Mariani, Stefano, additional, Minotto, Alessandro, additional, Egri, Gabriella, additional, Dähne, Lars, additional, Cacialli, Franco, additional, and Barillaro, Giuseppe, additional

Published
2021
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44. Lanthanide-Induced Photoluminescence in Lead-Free Cs2AgBiBr6 Bulk Perovskite: Insights from Optical and Theoretical Investigations

Author

Schmitz, Fabian, primary, Guo, Kunping, additional, Horn, Jonas, additional, Sorrentino, Roberto, additional, Conforto, Gioele, additional, Lamberti, Francesco, additional, Brescia, Rosaria, additional, Drago, Filippo, additional, Prato, Mirko, additional, He, Zhubing, additional, Giovanella, Umberto, additional, Cacialli, Franco, additional, Schlettwein, Derck, additional, Meggiolaro, Daniele, additional, and Gatti, Teresa, additional

Published
2020
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45. Expanded Multiband Super-Nyquist CAP Modulation for Highly Bandlimited Organic Visible Light Communications

Author

Chvojka, Petr, primary, Haigh, Paul Anthony, additional, Minotto, Alessandro, additional, Burton, Andrew, additional, Murto, Petri, additional, Genene, Zewdneh, additional, Mammo, Wendimagegn, additional, Andersson, Mats R., additional, Wang, Ergang, additional, Ghassemlooy, Zabih, additional, Cacialli, Franco, additional, Darwazeh, Izzat, additional, and Zvanovec, Stanislav, additional

Published
2020
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46. Modulating the luminance of organic light-emitting diodes via optical stimulation of a photochromic molecular monolayer at transparent oxide electrode

Author

Ligorio, Giovanni, primary, Cotella, Giovanni F., additional, Bonasera, Aurelio, additional, Zorn Morales, Nicolas, additional, Carnicella, Giuseppe, additional, Kobin, Björn, additional, Wang, Qiankun, additional, Koch, Norbert, additional, Hecht, Stefan, additional, List-Kratochvil, Emil J. W., additional, and Cacialli, Franco, additional

Published
2020
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47. Molecular-scale interface engineering for polymer light-emitting diodes

Author

Ho, Peter K. H., Kim, Ji-Seon, Burroughes, Jeremy H., Becker, Heinrich, Li, Sam F. Y., Brown, Thomas M., Cacialli, Franco, and Friend, Richard H.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Peter K. H. Ho [1, 2]; Ji-Seon Kim [1]; Jeremy H. Burroughes [2]; Heinrich Becker [3]; Sam F. Y. Li [4]; Thomas M. Brown [1]; Franco Cacialli [1]; Richard [...]

Published
2000
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48. Work functions and surface functional groups of multiwall carbon nanotubes

Author

Ago, Hiroki, Kugler, Thomas, Cacialli, Franco, Salaneck, William R., Shaffer, Milo S.P., Windle, Alan H., and Friend, Richard H.

Subjects
Chemistry, Physical and theoretical -- Research, Carbon -- Research, Valence -- Research, Spectrum analysis -- Usage, Chemicals, plastics and rubber industries
Abstract

Ultraviolet photoelectron spectroscopy has been used to study the work function and density of states of multiwall carbon nanotubes. Results indicate that oxidative treatments increase the work function and influence the valence bands DOS.

Published
1999

49. Diarylethenes in Optically Switchable Organic Light‐Emitting Diodes: Direct Investigation of the Reversible Charge Carrier Trapping Process.

Author

Cotella, Giovanni F., Bonasera, Aurelio, Carnicella, Giuseppe, Minotto, Alessandro, Hecht, Stefan, and Cacialli, Franco

Subjects
PHOTOCHROMIC materials, LIGHT emitting diodes, CHARGE carriers, ATOMIC force microscopy, ELECTRON transport, THRESHOLD voltage
Abstract

The design, fabrication, and characterization of optically switchable organic light‐emitting diodes (OSOLEDs) based on the combination of the commercially available light‐emitting polymer poly(9,9′‐dioctylfluorene‐alt‐benzothiadiazole), F8BT, doped with a diarylethene derivative is reported. The photochromic activity of the dopant in the solid state has been investigated both via UV/vis absorption and photoluminescence spectroscopy, whereas the morphology of different blends is investigated via atomic force microscopy. OSOLEDs embedding dopant loadings of 1, 5, and 10 wt% exhibit optical responsivity with a maximum reversible optical threshold voltage shift of 4 V. The best performing devices containing 5 wt% dopant show a maximum current density and luminance ON/OFF ratio of ≈20 and ≈90, respectively. For the first time, the impact of the diarylethene isomerization on hole and electron transport has been decoupled and directly investigated, via the design, fabrication, and characterization of single‐carrier switchable devices based on the same blends. Not only do these results confirm the photo‐responsive trapping activity of the diarylethenes on both charge carriers, but they also demonstrate its asymmetry, with a predominant effect on electron transport that is over 3.4 times larger as compared to hole transport. [ABSTRACT FROM AUTHOR]

Published
2022
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