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Chiral Oligothiophenes with Remarkable Circularly Polarized Luminescence and Electroluminescence in Thin Films
Author(s) -
Albano Gianluigi,
Aronica Laura Antonella,
Minotto Alessandro,
Cacialli Franco,
Di Bari Lorenzo
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202003547
Subject(s) - electroluminescence , materials science , luminescence , carbazole , oled , active layer , optoelectronics , circular polarization , supramolecular chemistry , thin film , phenylene , layer (electronics) , photochemistry , molecule , nanotechnology , optics , chemistry , polymer , physics , organic chemistry , thin film transistor , microstrip , composite material
Abstract This work reports the first observation of circularly polarized electroluminescence (CPEL) in thin films of self‐organized oligothiophenes. Four new 1,4‐phenylene and 9 H ‐carbazole‐based oligothiophenes were ad hoc designed to ensure efficient spontaneous formation of chiral supramolecular order. They were easily synthesized and their chiroptical properties in thin films were measured. Circularly polarized luminescence (CPL) spectra revealed g lum in the order of 10 −2 on a wide wavelengths range, originating from their self‐organized chiral supramolecular organization. These molecules have reasonable properties as organic semiconductors and for this reason they can constitute the active layer of circularly‐polarized organic light‐emitting diodes (CP‐OLEDs). Thus, we could investigate directly their electroluminescence (EL) and CPEL, without resorting to blends, but rather in a simple multilayer device with basic architecture. This is the first example of a CP‐OLED with active layer made only of a small organic compound.