Carlo Taliani

TL;DR: Research in the use of organic polymers as active semiconductors in light-emitting diodes has advanced rapidly, and prototype devices now meet realistic specifications for applications.

TL;DR: In this article, the first experimental evidence of room temperature direct spin polarized injection in sexithienyl (T 6 ), a prototypical organic semiconductor, from colossal magnetoresistance manganite La 0.7 Sr 0.3 MnO 3 (LSMO), was reported.

Abstract: Since 1987, high-luminance low-voltage driven devices based on tris(8-hydroxyquinoline)aluminum(III) (Alq3) opened the route to design low-cost large area displays and illuminators. Despite the large number of studies devoted to this material, very little is known about its basic structural and optical properties in the solid state. Therefore, we have investigated the structure(s) and the correlation between intermolecular interactions and optical properties in various Alq3 systems, including solution, amorphous thin films, and different crystalline forms. Two novel unsolvated polymorphs of Alq3, namely, α-Alq3 and β-Alq3, have been synthesized and their crystalline structures determined from X-ray diffraction data on powders (α) and single crystals (β). Crystals of α-Alq3 are triclinic, space group P-1, a = 6.2586(8) A, b = 12.914(2) A; c = 14.743(2) A, α = 109.66(1)°; β = 89.66(1)°, and γ = 97.68(1)°; crystals of β-Alq3 are triclinic, space group P-1, a = 8.4433(6) A, b = 10.2522(8) A; c = 13.1711(10) A...

TL;DR: In this article, the initial stages of the interface formation by depositing the metal onto the surface of a polymer film were studied, and charge transfer processes between the metal and the polymer were analyzed using corelevel x-ray photoelectron spectroscopy (XPS).

TL;DR: The presence of preferential directions suggests that orientational ordering is induced by the mica substrate, and the possibility of obtaining ordered aggregates by a suitable choice of substrate and temperature during evaporation has relevance towards the realization of molecular devices with anisotropic properties.