Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 26, Issue 70, Pages 16622-16627Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202003547
Keywords
circularly polarized electroluminescence; circularly polarized luminescence; CP-OLED; oligothiophenes; thin films
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Funding
- Universita di Pisa [PRA 2017_28, PRA 2018_23]
- MIUR, Ministero dellIstruzione, dellUniversita e della Ricerca (PRIN) [20172M3K5N]
- EPSRC [EP/P006280/1]
- Royal Society Wolfson Foundation Research Merit Award
- EPSRC [EP/P006280/1] Funding Source: UKRI
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This work reports the first observation of circularly polarized electroluminescence (CPEL) in thin films of self-organized oligothiophenes. Four new 1,4-phenylene and 9H-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.
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