Developing organic semiconductors (OSCs) for organic thin film transistors (OTFT) and optoelectronic applications is a challenge. The development of novel and more efficient (opto)electronic devices has become the center of great focus in both chemistry and materials science, due to the profound effect they have on our lives. Currently there is much focus on novel organic and flexible electronics. In general, organic semiconductors, when compared to traditional Si and GaAs-based technologies, offer unique features such as tunable electronic structure and physicochemical properties via core functionalization, mechanical flexibility as well as variable optical band gaps and ability to be solution processed on a large scale with low cost. Critical to this objective is the development of more efficient OSCs integrating excellent charge transport with efficient light emission properties. Organic thin film transistors (OTFTs) are particularly important, and the number of publications in this field has exploded since the seminal report by Koezuka in 1987. Those with ambipolar charge transport characteristics (i.e. where both the electron (µe) and hole (µh) mobilities are equally important) have recently become an important targets. Recently we have developed highly crystalline pentacyclic diamides (Figure 1) which showed good OTFT and OLED potential and energy gaps of 2.60 eV and 2.54 eV. They exhibited interesting photo and eletroluminescence activity. Besides, both compounds showed good quantum yields (0.56 and 0.6 (compound on the left). To get to these key studies, we needed to optimize the synthesis of the molecules (still in course), and fully characterize them by routine physicochemical techniques (cyclovoltammetry, absorbtion and emissio spectroscopy), including single-crystal X-ray crystallography and computational calculations (DFT; to determine the HOMO-LUMO band gaps, mobility values and the reorganization energies). In this presentation, this will be discussed in depth.

Novel small heterocycles with interesting electrochemical and optoelectronic properties

ACS Spring Meeting 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.