Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter

The demand for energy-efficient light sources has witnessed a significant surge in the recent era, due to the increasing awareness towards environmental concerns and climate change. Organic Light Emitting Diodes (OLEDs) offer superior display quality, energy efficiency, and sustainability, which makes them an ideal choice for eco-conscious consumers and reduced carbon footprint-based industries. The thinner and more flexible OLEDs have revolutionized the field of smartphones, televisions, automotive displays, and wearable gadgets. Here, in this paper, an efficient OLED device is fabricated starting from the synthesis of a donor-acceptor-based emitter, followed by its purification. The organic synthesis process is explained briefly. For purification, firstly, the product mixture is purified by column chromatography, and then it is sublimed using a temperature gradient vacuum sublimation set-up to obtain a high-purity compound. The ultimate goal is to make a multi-layered OLED device that needs ultra-high-purity emitters. Making an efficient OLED needs precision and expertise; thus, showcasing a detailed step-by-step protocol is important to the science community. Here, the details about the solution-processed OLED device fabrication is unfolded in four steps (substrate cleaning, spin coating of layers, thermal evaporation of layers, and device performance measurement). First, the substrates need to be cleaned using a well-established protocol. Next, the layered architecture is obtained by spin coating and thermal deposition of desired materials to the required thickness. The thermal evaporation is done using a high vacuum thermal evaporator with an integrated glove box setup. Finally, to obtain the device's performance, measurements are to be carried out in a dark environment. This comprehensive work will provide in-depth knowledge of device fabrication and inspire more researchers towards decorating this world with OLEDs.