Chiral Oligothiophenes with Remarkable Circularly Polarized Luminescence and Electroluminescence in Thin Films |
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Authors: | Dr. Gianluigi Albano Dr. Laura Antonella Aronica Dr. Alessandro Minotto Prof. Franco Cacialli Prof. Lorenzo Di Bari |
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Affiliation: | 1. Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124 Pisa, Italy;2. Department of Physics and Astronomy and London Centre, for Nanotechnology, University College London, London, WC1E 6BT UK |
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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 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 glum 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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Keywords: | circularly polarized electroluminescence circularly polarized luminescence CP-OLED oligothiophenes thin films |
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