Polymer‐Based Composites for Engineering Organic Memristive Devices

Memristive materials are related to neuromorphic applications as they can combine information processing with memory storage in a single computational element, just as biological neurons. Many of these bioinspired materials emulate the characteristics of memory and learning processes that happen in the brain. In this work, we report the memristive properties of a two-terminal (2-T) organic device based on ionic migration mediated by an ion-transport polymer. The material possesses unique memristive properties: it is reversibly switchable, shows tens of conductive states, presents Hebbian learning demonstrated by spiking time dependent plasticity (STDP), and behaves with both short- (STM) an…

Green light-emitting electrochemical cells based on platinum(ii) complexes with a carbazole-appended carbene ligand

This article is part of the themed collections: Paul R. Raithby at 70: in celebration of a life in chemistry, Recent Open Access Articles and 2022 Journal of Materials Chemistry C Most Popular Articles.

Stable Light-Emitting Electrochemical Cells Using Hyperbranched Polymer Electrolyte

The choice of an adequate electrolyte is a fundamental aspect in polymer light-emitting electrochemical cells (PLECs) as it provides the in situ electrochemical doping and influences the performance of these devices. In this study, a hyperbranched polymer (Hybrane DEO750 8500) blended with a Li salt is used as a novel electrolyte in state-of-the-art Super Yellow (a polyphenylenevinylene) based LECs. Due to the desirable properties of the hyperbranched polymer and the homogeneous and smooth films that it forms with the emitting polymer, PLEC with excellent electroluminescent properties are obtained using a pulsed current bias scheme. The devices are very stable, with lifetimes in excess of 2…

Transparent Light‐Emitting Electrochemical Cells

Single layer light-emitting electrochemical cells (LECs) are amongst the simplest electroluminescent devices and operate with air-stable electrodes. Transparent light-emitting devices are of great interest as they can enable new applications in consumer electronics. In this work, a transparent ionic transition metal complex based LEC is fabricated by developing a transparent top contact based on tin (IV) oxide (SnO2) and indium-tin oxide, processed by low-temperature atomic layer deposition and pulsed laser deposition, respectively. The resulting devices present transparency in excess of 75% over the full visible spectrum (380-750 nm), with 82% transmission at the emission peak (563 nm). Th…

Efficient Semitransparent Perovskite Solar Cells Based on Thin Compact Vacuum Deposited CH3NH3PbI3 Films

Lead halide perovskite materials are promising candidates for the application of semitransparent solar cells due to their bandgap tunability and high device efficiencies. The high absorption coefficient of these materials, however, makes it difficult to attain high average visible transmittance values without compromising the power conversion efficiencies (PCEs). In this work, a co-evaporation process is employed to fabricate thin (50 and 100 nm) methylammonium lead iodide (MAPI) perovskite films and integrate them in semitransparent perovskite solar cells (ST-PSCs). Due to the compact nature of the thin MAPI films, the resultant fully vacuum and room temperature-processed devices demonstra…

A counterion study of a series of [Cu(P^P)(N^N)][A] compounds with bis(phosphane) and 6-methyl and 6,6′-dimethyl-substituted 2,2′-bipyridine ligands for light-emitting electrochemical cells†

The syntheses and characterisations of a series of heteroleptic copper(i) compounds [Cu(POP)(Mebpy)][A], [Cu(POP)(Me2bpy)][A], [Cu(xantphos)(Mebpy)][A] and [Cu(xantphos)(Me2bpy)][A] in which [A]− is [BF4]−, [PF6]−, [BPh4]− and [BArF4]− (Mebpy = 6-methyl-2,2′-bipyridine, Me2bpy = 6,6′-dimethyl-2,2′-bipyridine, POP = oxydi(2,1-phenylene)bis(diphenylphosphane), xantphos = (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphane), [BArF4]− = tetrakis(3,5-bis(trifluoromethyl)phenyl)borate) are reported. Nine of the compounds have been characterised by single crystal X-ray crystallography, and the consequences of the different anions on the packing interactions in the solid state are discussed. T…

Tunable luminescent lead bromide complexes

Lead halides are used extensively to prepare perovskite-based devices but it is less known that lead halides can also form luminescent complexes in solvents. Using polyethylene glycol as a solvent, a lead bromide complex with a photoluminescence quantum yield over 20% is obtained and the photoluminescence peak can be shifted around 50 nm with different alkylammonium bromides.

Innovative Approaches for Light-Emitting Electrochemical Cells

El uso de nuevos materiales, como las moléculas emisoras de luz o los polímeros transportadores de iones, tiene una importancia fundamental a la hora de mejorar la vida útil o de conseguir altos niveles de luminancia en dispositivos de tipo LEC. Al mismo tiempo, los avances más recientes han llevado a la tecnología LED y OLED a una nueva clase de dispositivos con propiedades atractivas, como la flexibilidad o la transparencia, desarrollo que se ha llevado a cabo de forma muy limitada en los LECs. Teniendo esto en cuenta, el trabajo de esta Tesis se centró en la implementación de nuevos materiales, en particular nuevos emisores iTMC y un polímero conductor iónico, y el diseño y fabricación d…

Ionic multiresonant thermally activated delayed fluorescence emitters for light emitting electrochemical cells

Funding: M. K. would like to thank 2214-A International Research Fellowship Programme for Ph.D. students (1059B141900585). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreement No 838885 (NarrowbandSSL). S.M.S. acknowledges support from the Marie Skłodowska-Curie Individual Fellowship (grant agreement No 838885 NarrowbandSSL). A. K. G. is grateful to the Royal Society for Newton International Fellowship NF171163. L.M acknowledges that the project who gave rise to these results received support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and inno…

Dimensionality Controls Anion Intermixing in Electroluminescent Perovskite Heterojunctions.

Metal halide perovskites have emerged as a promising group of materials for optoelectronic applications such as photovoltaics, light emission, and photodetectors. So-far, in particular, the stability of light-emitting devices is limited, which is in part attributed to the intrinsic ionic conductivity of these materials. High-performance devices inevitably contain heterojunctions similar to other optoelectronic devices based on oxide perovskites, II-VI, or III-V group semiconductors. To enable efficient heterojunctions, ion exchange at the interface between different layers should be controlled. Herein, we report a method that enables to control and monitor the extent of anion intermixing be…

CCDC 2081388: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

CCDC 2081386: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

Ionic Multi-Resonant Thermally Activated Delayed Fluorescence Emitters for Light Emitting Electrochemical Cells (dataset)

CCDC 2081394: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

CCDC 2081387: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

CCDC 2151291: Experimental Crystal Structure Determination

Related Article: Sara Fuertes, Lorenzo Mardegan, Ignacio Martínez, Silvia Ventura, Irene Ara, Daniel Tordera, Henk J. Bolink, Violeta Sicilia|2022|J.Mater.Chem.C|10|15491|doi:10.1039/D2TC02539F

CCDC 2151293: Experimental Crystal Structure Determination

Related Article: Sara Fuertes, Lorenzo Mardegan, Ignacio Martínez, Silvia Ventura, Irene Ara, Daniel Tordera, Henk J. Bolink, Violeta Sicilia|2022|J.Mater.Chem.C|10|15491|doi:10.1039/D2TC02539F

CCDC 2151294: Experimental Crystal Structure Determination

Related Article: Sara Fuertes, Lorenzo Mardegan, Ignacio Martínez, Silvia Ventura, Irene Ara, Daniel Tordera, Henk J. Bolink, Violeta Sicilia|2022|J.Mater.Chem.C|10|15491|doi:10.1039/D2TC02539F

CCDC 2081391: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

CCDC 2081389: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

CCDC 2081393: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

CCDC 2081390: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

CCDC 2081392: Experimental Crystal Structure Determination

Related Article: Marco Meyer, Lorenzo Mardegan, Daniel Tordera, Alessandro Prescimone, Michele Sessolo, Henk J. Bolink, Edwin C. Constable, Catherine E. Housecroft|2021|Dalton Trans.|50|17920|doi:10.1039/D1DT03239A

CCDC 2151292: Experimental Crystal Structure Determination

Related Article: Sara Fuertes, Lorenzo Mardegan, Ignacio Martínez, Silvia Ventura, Irene Ara, Daniel Tordera, Henk J. Bolink, Violeta Sicilia|2022|J.Mater.Chem.C|10|15491|doi:10.1039/D2TC02539F