Browsing by Author "Vilches Astudillo, Diego Pablo"

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    Effect of Alkyl Side Chains in BDT and 2D-BDT Small-Molecules as Donor Materials for Vacuum-Processed Organic Photovoltaic Devices
    (WILEY-V C H VERLAG GMBH, 2024) Antoine Ortiz, Cristian Miguel Luis; Vilches Astudillo, Diego Pablo; Preuss, Paulo; Ángel Figueroa, Felipe Alfonso
    Nine molecules based on benzo[1,2-b:4,5-b ']dithiophene (BDT) and 2D-BDT derivatives are studied as donor materials in organic photovoltaic (OPV) devices fabricated by thermal evaporation, aiming to understand how different alkyl lateral substituents affect the molecular packing, the charge transport, and, subsequently, the device performance. Synthesis of the molecules is followed by a comprehensive characterization using thermal and differential scanning calorimetry analyses, which confirm their thermal stability and suitability for vacuum-processed OPV devices. Thermal analysis also demonstrates a strong correlation between the melting point reduction of the molecules and the disorder caused by the alkyl chains. As the synthesized molecules present similar optical properties, the differences in the device performance are caused by the different substituents. BDT derivatives with low melting point temperatures produce reduced current density, hole mobility, and overall device performance, which are attributed to poor molecular packing. Additionally, energy-dispersive X-ray spectroscopy analysis suggests phase separation with fullerene, further impacting the efficiency of the devices. The findings indicate that the photovoltaic performance of BDT-based molecules can be modulated by avoiding aliphatic substituents, providing a strategy for the design of more efficient materials, with thermal evaporation as an ideal method to evaluate and decouple molecular packing from solubility.
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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.