A5047162430- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Thin-Film Transistor Technologies
- melanin and skin pigmentation
- Organic Electronics and Photovoltaics
- Photochromic and Fluorescence Chemistry
- Olfactory and Sensory Function Studies
- Semiconductor materials and devices
- Silicon Nanostructures and Photoluminescence
- Molecular Junctions and Nanostructures
- Laser Material Processing Techniques
- Advanced Sensor and Energy Harvesting Materials
- Photoreceptor and optogenetics research
- Garlic and Onion Studies
- Advancements in Semiconductor Devices and Circuit Design
- Modular Robots and Swarm Intelligence
- bioluminescence and chemiluminescence research
- ZnO doping and properties
- Green IT and Sustainability
- Photochemistry and Electron Transfer Studies
- Luminescence Properties of Advanced Materials
- Transition Metal Oxide Nanomaterials
- Luminescence and Fluorescent Materials
- Advanced Thermoelectric Materials and Devices
- Photonic Crystals and Applications
National Agency for New Technologies, Energy and Sustainable Economic Development
2014-2025
University of Naples Federico II
2024
ENEA Portici Research Centre
2005-2024
Melanin denotes a variety of mammalian pigments, including the dark electrically conductive eumelanin and reddish, sulphur-containing, pheomelanin. Organic (bio)electronics is showing increasing interests in exploitation, e.g. for bio-interfaces, but low conductivity material limiting development eumelanin-based devices. Here, first time, we report an abrupt increase electrical conductivity, revealing highest value presented to date 318 S/cm. This result, obtained via simple thermal...
Typical non-linear current–voltage curves with a closed hysteresis loop (memristive-like behavior) were observed in aPS/PANI/Au hybrid nanocomposite devices.
The growing interest toward biocompatible and bioinspired materials is boosting the investigation engineering of natural products as active components in electronic devices. human pigment melanin, particularly its subgroup composed by eumelanins, black‐brown pigments derived from oxidative polymerization L‐3,4‐dihydroxyiphenylalanine ( l ‐DOPA) via 5,6‐dihydroxy‐indole intermediates are increasingly emerging valuable candidates for organic (bio)electronics applications. Capitalizing on a...
Indium tin oxide (ITO) is a transparent conductive (TCO) commonly used in the realization of optoelectronic devices needing at least electrode. In this work, ITO thin films were deposited on glass substrates by non-reactive RF magnetron sputtering, investigating effects power density, sputtering pressure, and substrate temperature electrical, optical, structural properties as-grown films. High-quality films, terms crystallinity, transparency, conductivity obtained. The 120 nm thick grown 225...
Highly sensitive alternate current (ac) impedance measurements with variable temperature have been performed to investigate the optical and electrical failure mechanisms during glass transition phenomena in archetypal ITO/TPD/Alq3/Al organic light emitting diode (OLED) structure. Since device degradation is mainly related lower (Tg) of N,N′-Bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD), this study focused on frequency response thin TPD films approaching glassy region. The experimental...
In this paper, we present a new type of parallax barrier, for switchable 2D/3D display vision, obtained by using Reverse Mode Polymer Dispersed Liquid Crystal (RV-PDLC). The barrier was prepared sandwiching the RV-PDLC film between two ITO conductive glass supports. Strips were removed from one supports, in order to alternate not strips. way films could be electrically switched able turn 2D image 3D one. tree steps: (1) nematic diacrylate monomer (NDM) dissolved liquid crystal (NLC) presence...
Abstract The oxidative polymerization of 5,6‐dihydroxyindoles and related hydroxyindoles at pH<3 is diverted from the usual eumelanin‐forming pathway to produce mixtures symmetric asymmetric triazatruxenes (TATs), which could be separated characterized for their opto‐electronic properties with aid TD‐DFT calculations. Data showed that isomers exhibit higher fluorescence quantum efficiencies, lower HOMO–LUMO gaps, better film homogeneity, a more definite aggregation behavior than...
Abstract A recently developed protocol allows to prepare high quality thin films integrating eumelanin pigment with standard commercial poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The new blend combines noteworthy water stability and substrate adhesion valuable electro‐optical properties, so it can be used as anodic material in indium tin oxide‐free organic light emitting diodes. Starting from these results, the present work systematically addresses parameters...
By pursuing the strategy of manipulating natural compounds to obtain functional materials, in this work, we report on synthesis and characterization a luminescent cationic iridium complex (cis-1), designed starting from catecholic neurotransmitter dopamine, exhibiting unusual cis arrangement C∧N ligands. Through an integrated experimental theoretical approach, it was possible delineate optoelectronic properties cis-1. In detail, (a) series absorption maxima range 300-400 nm assigned...
Zinc oxide nanoparticles (ZnONPs) and stearic acid are herein used for the preparation of hydrophobic coatings with good moisture barrier property on flexible plastic substrates. Fast, high throughput, mild easy-to-run processing techniques, like airbrushing gravure printing, applied thin films deposition these materials. The results this study indicated that best coating in terms water contact angle (115°) is obtained through a two-steps printing ZnONPs layer followed by layer. All...
Organic Light Emitting Diodes (OLEDs) are a cutting-edge lighting technology that allows to create thin, light weight, diffuse-emitting, glare-free, and even transparent sources having low power consumption, wide color gamut, fast response time, precise dimming. Transparent OLEDs (TrOLEDs) can be integrated into architectural glass windows, car windshields, divider panels, or lamps, thus enabling the creation of objects with captivating innovative designs, allowing natural pass through,...
The integration of the pristine not-doped commercial poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) PH1000 with eumelanin, brown to black kind melanin pigment, was achieved by dissolving melanogenic precursors 2-carboxy-5,6-dihydroxyindole (DHICA) in suspension. Solid state oxidative polymerization catecholic indole allowed obtaining ternary blend PEDOT:PSS/eumelanin. introduction DHICA into produced a noticeable increase conductivity PEDOT thin films akin that dimethyl...
This study investigates the influence of deposition temperature hexamethyldisilazane (HMDS) on performances organic thin film transistors (OTFTs) using [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM) as semiconductor. N-type OTFTs have been fabricated this fullerene derivative, deposited from solution by drop casting technique HMDS self-assembled monolayer (SAM) at three different temperatures, 7 °C, 25 °C and 60 in order to evaluate these conditions morphology PC70BM films electrical...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper is focused on the stability of n-channel laser-crystallized polysilicon thin-film transistors (TFTs) submitted to a hydrogenation process during fabrication and with small grains dimension. With aid numerical simulations, we investigate effects static stress using two types procedures: hot carrier stress. Results show that variations trap state density into whole layer not only near...
The aim of this paper is to investigate the electrical and optical property modifications that can be related presence a nanometric metallic layer at interface between two organic emissive materials in stacked structure. For purposes comparison, reference devices have also been analyzed emphasize increase switching hysteresis behaviors current-voltage plots spectral variations electroluminescence. In paper, we tried summarize effects floating thin by extracting small number parameters which...
In this work, n-type organic thin film transistors (OTFTs) were fabricated in the bottom-gate bottom-contact configuration, depositing a fullerene-derived semiconductor (PC70BM) by drop-casting technique on SiO2 substrates treated with self-assembled monolayer, namely HMDS. The influence of deposition temperature HMDS device performance was investigated, using three different temperatures. relationship between properties resulting films and electrical characteristics evaluated through...
In this paper we present and discuss experimental results to evaluate performances aging behaviour of two Hole Transporting Material (HTM), TPD NPD, in Organic Light Emitting Device (OLED) with structure: ITO/HTM/Alq3/Al. For each these HTMs, devices several thicknesses have been built, measure emphasize behaviours material-geometry combinations. Electro-optical properties measured estimate compare brightness, power efficiency decays.
Organic light emitting diodes (OLEDs) are nowadays the most attractive technology for displays and lighting applications. However, their short lifetime remains important limit broad commercialization. In particular, blue OLEDs generally present worst stability respect to other colors. While extrinsic degradation can be easily controlled by proper encapsulation, understanding origins of intrinsic a challenge: up now, proposed mechanisms have not considered possible phenomena that occur during...
Abstract In recent years, the interest in structured hydrophobic surfaces has considerably grown, finding applications many industrial fields, including aerospace, automotive, and biomedical. Three‐dimensional (3D) printing technology is a simple, rapid, economic process to fabricate based on neat polymers composite materials, allowing working with wide variety of plastic materials. The manufactured show roughness depending design resolution: this characteristic ideal achieve...
Abstract Among the solid‐state lighting technologies, OLEDs occupy a prominent position for high efficiencies associated with low CO 2 emissions. In line recent studies aimed at designing sustainable and biodegradable devices, herein we report on synthesis of series iridium(III) complexes featuring, as β‐diketone ligands, curcumin 6‐dehydrogingerdione, two natural compounds found in rhizome Curcuma longa Zingiber officinale . To improve solubility both ligands prevent aggregation complexes,...
The impact of eumelanin integration into PEDOT:PSS is explored here by means in-depth electron paramagnetic resonance measurements to shed light on the possible contribution mammalian pigment thermopower improvement PEDOT:PSS.