0000000001302621
AUTHOR
Gonzalo García-espejo
showing 13 related works from this author
Tenfold increase in efficiency from a reference blue OLED
2018
Abstract Starting from a reference single-layer light-emitting diode based on the blue phosphorescent bis-cyclometallated iridium complex FIrpic as guest, hosted in a PVK (non-conjugated poly(vynilcarbazole)) matrix, different strategies are followed to improve the efficiency of the devices through the combination of solution processed and evaporated layers. Injection of charges from the electrodes has been varied by using different conductive PEDOT: PSS as hole injection layer and a nanoscale Cs2CO3 interlayer as electron injection and hole-blocking film. Furthermore, a separated electron injection/hole blocking evaporated layer, TPBi or 3TPYMB, is introduced in double-layer devices to enh…
Heterovalent BiIII/PbII ionic substitution in one-dimensional trimethylsulfoxonium halide pseudo-perovskites (X = I, Br)
2021
We report on the synthesis and characterization of novel lead and bismuth hybrid (organic-inorganic) iodide and bromide pseudo-perovskites (ABX3) containing the trimethylsulfoxonium cation (CH3)3SO+ (TMSO) in the A site, Pb/Bi in the B site, and Br or I as X anions. All of these compounds are isomorphic and crystallize in the orthorhombic Pnma space group. Lead-based pseudo-perovskites consist of one-dimensional (1D) chains of face-sharing [PbX6] octahedra, while in the bismuth-based ones, the chains of [BiX6] are interrupted, with one vacancy every third site, leading to a zero-dimensional (0D) local structure based on separated [Bi2I9]3- dimers. Five solid solutions for the iodide with di…
Long-Term Stability of TiS2–Alkylamine Hybrid Materials
2022
Layered TiS2 intercalated with linear alkylamines has recently attracted significant interest as a model compound for flexible n-type thermoelectric applications, showing remarkably high power factors at room temperature. The thermal and, particularly, environmental stability of such materials is, however, a still an open challenge. In this paper, we show that amine-intercalated TiS2 prepared by a simple mechanochemical process is prone to chemical decomposition through sulfur exsolution, and that the presence of molecular oxygen is likely to mediate the decomposition reaction. Through computational analysis of the possible reaction pathways, we propose that Ti-N adducts are formed as a con…
The structural versatility of proton sponge bismuth halides
2022
Hybrid halometalates containing lead, tin, bismuth and antimony and organic cations have recently shown a bevy of interesting photophysical properties. Aiming at finding chemically stable and thermally inert species, three halobismutate species of this class, crystallized with proton sponge-derived cations (PRSH), have been isolated as microcrystalline powders by mixing 1,8-bis(dimethylamino)-naphthalene (proton sponge, or PRS) and bismuth oxide in concentrated HX acids (X = Cl, Br and I). The two isomorphous (PRSH)3Bi2X9 (X = Br, I) species, containing isolated [Bi2X9]3- anions, are triclinic at room temperature and convert upon heating into a monoclinic structure through a displacive …
Ultralow thermal conductivity in 1D and 2D imidazolium-based lead halide perovskites
2021
Low-dimensional hybrid organic–inorganic metal halide perovskites are rapidly emerging as a fascinating sub-class of the three-dimensional parent structures, thanks to their appealing charge and thermal transport properties, paired to better chemical and thermal stabilities. Extensive investigations of the thermal behavior in these systems are of paramount relevance to understand their optoelectronic and thermoelectric applications. Herein, we present a complete thermophysical characterization of imidazolium lead iodide, (IMI)PbI3, a 1D pseudo-perovskite with chains of face-sharing octahedra, and histammonium lead iodide, (HIST)PbI4, a 2D layered perovskite with corner-sharing octahedra. Up…
Conformationally rigid molecular and polymeric naphthalene-diimides containing C6H6N2 constitutional isomers
2021
Organic thin films based on naphthalenediimides (NDIs) bearing alkyl substituents have shown interesting properties for application in OLEDs, thermoelectrics, solar cells, sensors and organic electronics. However, the polymorphic versatility attributed to the flexibility of alkyl chains remains a challenging issue, with detrimental implications on the performances. Aryl analogues containing C6H6N2 constitutional isomers are herein investigated as one of the possible way-out strategies. The synthesis of molecular and polymeric species is described, starting from naphthaleneteracarboxyldianhydride with isomeric aromatic amines and hydrazine. The materials are fully characterized by spectrosco…
CCDC 2059772: Experimental Crystal Structure Determination
2022
Related Article: Vincenzo Mirco Abbinante, Gonzalo García-Espejo, Gabriele Calabrese, Silvia Milita, Luisa Barba, Diego Marini, Candida Pipitone, Francesco Giannici, Antonietta Guagliardi, Norberto Masciocchi|2021|J.Mater.Chem.C|9|10875|doi:10.1039/d1tc00564b
CCDC 2153969: Experimental Crystal Structure Determination
2022
Related Article: Gonzalo García-Espejo, Candida Pipitone, Francesco Giannici, Norberto Masciocchi|2022|J.Solid State Chem.|312|123165|doi:10.1016/j.jssc.2022.123165
CCDC 2059771: Experimental Crystal Structure Determination
2022
Related Article: Vincenzo Mirco Abbinante, Gonzalo García-Espejo, Gabriele Calabrese, Silvia Milita, Luisa Barba, Diego Marini, Candida Pipitone, Francesco Giannici, Antonietta Guagliardi, Norberto Masciocchi|2021|J.Mater.Chem.C|9|10875|doi:10.1039/d1tc00564b
CCDC 2153967: Experimental Crystal Structure Determination
2022
Related Article: Gonzalo García-Espejo, Candida Pipitone, Francesco Giannici, Norberto Masciocchi|2022|J.Solid State Chem.|312|123165|doi:10.1016/j.jssc.2022.123165
CCDC 2153968: Experimental Crystal Structure Determination
2022
Related Article: Gonzalo García-Espejo, Candida Pipitone, Francesco Giannici, Norberto Masciocchi|2022|J.Solid State Chem.|312|123165|doi:10.1016/j.jssc.2022.123165
CCDC 2059770: Experimental Crystal Structure Determination
2022
Related Article: Vincenzo Mirco Abbinante, Gonzalo García-Espejo, Gabriele Calabrese, Silvia Milita, Luisa Barba, Diego Marini, Candida Pipitone, Francesco Giannici, Antonietta Guagliardi, Norberto Masciocchi|2021|J.Mater.Chem.C|9|10875|doi:10.1039/d1tc00564b
CCDC 2059769: Experimental Crystal Structure Determination
2022
Related Article: Vincenzo Mirco Abbinante, Gonzalo García-Espejo, Gabriele Calabrese, Silvia Milita, Luisa Barba, Diego Marini, Candida Pipitone, Francesco Giannici, Antonietta Guagliardi, Norberto Masciocchi|2021|J.Mater.Chem.C|9|10875|doi:10.1039/d1tc00564b