Browsing by Author "Angel Figueroa, Felipe Alfonso"

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    Degradation of self-assembled monolayers in organic photovoltaic devices
    (2014) Angel Figueroa, Felipe Alfonso; Lyubarskaya, Yekaterina; Shestopalov, Alexander A.; Tang, Ching W.
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    Electroluminescent performance and color tuning of heteroleptic Cu(I) complex via controlled doping and layer engineering
    (2025) Vilches Astudillo, Diego Pablo; Antonie, Cristian; Lara Gonzalez, Fabián Andrés; Cabrera Caballero, Alan Raúl; Angel Figueroa, Felipe Alfonso; González Pavez, Iván
    Wereport the electroluminescent properties of a well-known Cu(I) complex based on P^P-type ligands—specifically bis[2-(diphenylphosphino)phenyl] ether (DPEphos)—and N^N-type ligands, namely, 2,9-dimethyl-1,10-phenanthroline (dmphen), [Cu(dmphen)(DPEphos)]BF4 (Cu1), as the emissive layer, transitioning from a light-emitting electrochemical cell (LEEC) to an organic light-emitting diode (OLED) configuration. No electroluminescence was observed in simple LEEC-type devices. However, the progressive introduction of injection and transport layers, and using 1,3-bis(carbazol-9-yl)benzene (mCP) as a host matrix, enabled efficient emission centered at 530nm. We achieved effective charge balance and confinement of the recombination zone within the host through systematic optimization of host and transport layer thicknesses. We further investigated the effect of Cu1 doping concentration in mCP (0%–30%) on the device performance and emission color. While 10% doping yielded the highest luminance and efficiency, the emission color was also modulated—from green with bluish hues at low doping to yellowish green at higher levels—demonstrating a straightforward strategy for color tuning using a single Cu(I) complex. Although Cu1 is not the most efficient emitter available, its well-characterized nature and response to device architecture make it an ideal model for understanding structure–function relationships. This study offers valuable insights into layer engineering and compositional tuning, which can facilitate the development of more efficient and color-tunable devices with next-generation Cu(I)-based emitters.
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    Electroluminescent performance and color tuning of heteroleptic Cu(I) complex via controlled doping and layer engineering
    (2025) Vilches Astudillo, Diego Pablo; Antonie, Cristian; Lara Gonzalez, Fabián Andrés; Cabrera Caballero, Alan Raúl; Angel Figueroa, Felipe Alfonso; González Pavez, Iván
    Wereport the electroluminescent properties of a well-known Cu(I) complex based on P^P-type ligands—specifically bis[2-(diphenylphosphino)phenyl] ether (DPEphos)—and N^N-type ligands, namely, 2,9-dimethyl-1,10-phenanthroline (dmphen), [Cu(dmphen)(DPEphos)]BF4 (Cu1), as the emissive layer, transitioning from a light-emitting electrochemical cell (LEEC) to an organic light-emitting diode (OLED) configuration. No electroluminescence was observed in simple LEEC-type devices. However, the progressive introduction of injection and transport layers, and using 1,3-bis(carbazol-9-yl)benzene (mCP) as a host matrix, enabled efficient emission centered at 530nm. We achieved effective charge balance and confinement of the recombination zone within the host through systematic optimization of host and transport layer thicknesses. We further investigated the effect of Cu1 doping concentration in mCP (0%–30%) on the device performance and emission color. While 10% doping yielded the highest luminance and efficiency, the emission color was also modulated—from green with bluish hues at low doping to yellowish green at higher levels—demonstrating a straightforward strategy for color tuning using a single Cu(I) complex. Although Cu1 is not the most efficient emitter available, its well-characterized nature and response to device architecture make it an ideal model for understanding structure–function relationships. This study offers valuable insights into layer engineering and compositional tuning, which can facilitate the development of more efficient and color-tunable devices with next-generation Cu(I)-based emitters.
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    Electroluminescent performance and color tuning of heteroleptic Cu(I) complex via controlled doping and layer engineering
    (2025) Vilches Astudillo, Diego Pablo; Antonie, Cristian; Lara Gonzalez, Fabián Andrés; Cabrera Caballero, Alan Raúl; Angel Figueroa, Felipe Alfonso; González Pavez, Iván
    Wereport the electroluminescent properties of a well-known Cu(I) complex based on P^P-type ligands—specifically bis[2-(diphenylphosphino)phenyl] ether (DPEphos)—and N^N-type ligands, namely, 2,9-dimethyl-1,10-phenanthroline (dmphen), [Cu(dmphen)(DPEphos)]BF4 (Cu1), as the emissive layer, transitioning from a light-emitting electrochemical cell (LEEC) to an organic light-emitting diode (OLED) configuration. No electroluminescence was observed in simple LEEC-type devices. However, the progressive introduction of injection and transport layers, and using 1,3-bis(carbazol-9-yl)benzene (mCP) as a host matrix, enabled efficient emission centered at 530nm. We achieved effective charge balance and confinement of the recombination zone within the host through systematic optimization of host and transport layer thicknesses. We further investigated the effect of Cu1 doping concentration in mCP (0%–30%) on the device performance and emission color. While 10% doping yielded the highest luminance and efficiency, the emission color was also modulated—from green with bluish hues at low doping to yellowish green at higher levels—demonstrating a straightforward strategy for color tuning using a single Cu(I) complex. Although Cu1 is not the most efficient emitter available, its well-characterized nature and response to device architecture make it an ideal model for understanding structure–function relationships. This study offers valuable insights into layer engineering and compositional tuning, which can facilitate the development of more efficient and color-tunable devices with next-generation Cu(I)-based emitters.
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    Rhenium and Rhenium–Copper Nanoparticles: Evaluation of the Catalytic Activity for the Decomposition of Ammonium Perchlorate
    (2023) Preuss, P.; Méndez, G.Y.; Hormazábal-Campos, C.; Ramírez, A.M.R.; Angel Figueroa, Felipe Alfonso; Camarada, M.B.
    © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.Composites of rhenium (ReNP) and rhenium–copper nanoparticles (ReCuNP) were studied as catalysts for the decomposition of the oxidizer ammonium perchlorate (AP) for composite solid propellants. Both composites were prepared by reducing ammonium perrhenate (NH4ReO4) and copper chloride (CuCl2) in the presence of polyamidoamine (PAMAM) dendrimers. The PAMAM-based nanostructures were characterized by transmission electron microscopy (TEM), high resolution TEM, and X-ray photoelectron spectroscopy. ReNP@PAMAM samples showed rhenium clusters and partially oxidized spherical nanoparticles of approx. 1 nm in diameter, while ReCuNP@PAMAM comprised nanoparticles of 6 nm in average size with different shapes and high-size dispersion. The computational description demonstrated the higher stability of the interaction between copper and PAMAM than perrhenate anion due to the charge transfer from the dendrimer to the cation. The materials were evaluated for the catalytic decomposition of AP by calorimetry. The catalytic performance of ReCuNP@PAMAM was superior to that of ReNP@PAMAM, lowering the decomposition of AP at high temperatures. However, the latter composite increased the energy release drastically due to the exothermic oxidation of rhenium metal. Graphical Abstract: [Figure not available: see fulltext.].
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    Silver-induced activation of 8-hydroxyquinolinato lithium as electron injection material in single-stack and tandem OLED devices
    (2018) Angel Figueroa, Felipe Alfonso; Gao, Rui; Wallace, Jason U.; Tang, Ching W.
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    Synthesis and characterization of a 2,3-dialkoxynaphthalene-based conjugated copolymer via direct arylation polymerization (DAP) for organic electronics
    (2020) Jessop, I.A.; Chong, A.; Graffo, L.; Camarada, M.B.; Espinoza, C.; Angel Figueroa, Felipe Alfonso; Saldías, C.; Tundidor-Camba, A.; Terraza, C.A.
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    Synthesis of amorphous monomeric glass mixture for organic electronic applications
    (2015) Mason Wu, You-Chi; Molaire, Michel F.; Weiss, David S.; Angel Figueroa, Felipe Alfonso; Deblase, Catherine R.; Fors, Brett P.
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    Tailoring of titanium dioxide thin film in dual radiofrequency plasma enhanced pulsed laser deposition
    (2025) Villegas Dissett, Rodrigo Benjamín; Tomlinson Cornejo, Matías Paul; Ureta De La Fuente, Valentina Isidora; Carrasco Navarro, Camilo Antonio; Miranda, Maximiliano; Fernández Adell, José Ignacio; Saavedra, Daniel; Retamal, María José; Inestrosa-Izurieta, Maria Jose; Singh, Dinesh Pratap; Angel Figueroa, Felipe Alfonso; Volkmann, Ulrich Georg; Takamura, Yayoi; Bhuyan, Heman
    Efficient and cost-effective methods to create photovoltaic materials are constantly being sought, with metal oxides like TiO2 playing a key role in this field. In this study, TiO2 thin films were grown on glass substrates using a dual radiofrequency (RF) plasma-enhanced pulsed laser deposition (PLD) system with a thermal budget that remained below 400 °C. The physical, chemical, and optical properties of the deposited thin films were studied as a function of low- and high-RF powers as well as deposition time. These parameters were found to impact the proportion of anatase and rutile phase and their crystallinity, as well as the oxygen vacancy concentration and band gap energy. These findings demonstrated the utility of dual RF plasma-enhanced PLD for precise modulation of TiO2 thin-films, offering promising applications in photovoltaics and photocatalysis