Abstract:
Organic materials exhibit good photoluminescent responses and attracted considerable 10 interest due to their potential application in electronics and optoelectronics. it-Conjugated organic system with donor-acceptor (D-A) moiety showing a wide range of interesting optical, electrical, and photovoltaic properties in the solid state.' Among their many application fields, electroluminescence (EL) devices using small molar mass organic materials have become the most popular technology that have already been employed in practical applications such as flexible devices. Organic materials have advantages over inorganic ones such as low cost, environmental friendly and the ease of handling. In addition to that, linkage of functional groups and enlargement in molecule has endowed the molecular structural properties, lead to interesting and unique electrical and photovoltaic properties.24 Also providing light weight flexible structure for ceo friendly and low cost manufacturing processes such as ink-jet printing.59 In the dilute solutions, most of the it-conjugated organic compounds arc highly emissive in nature but when they are fabricated into devices become weakly luminesccnt.° Organic molecules in their solid state aggregates to form excimcrs as less crnissive species, which reduces the luminescence efficiency in the devices." Most of the conjugated organic compounds as a promising materials are utilized in the form of thin solid films in their application.
