High-efficiency Solution Processed Small Molecule Organic Light-emitting Diodes Investigation

Since the birth of Organic Light Emitting Diode(OLED), known as the next generation of solid-state light source, both people from academic and industrial field have shown a keen interest in it, for the hopeful application in flat-panel displays and lighting. OLED technology, which has the potential performance in the spectrum, structure, energy consumption, flexible, weight and thickness, however, also failed to meet the application requirements on the device efficiency, lifetime and cost. Everything needs to follow the inner law of economy. What consumers consider in their final decision is the price. Therefore, how to simplify the process, reduce the manufacturing cost, is the best way to gain market recognition.First study is about the solution-processed hole injection and transport layer in OLED devices. The method is using the soluble transition metal oxides of ammonium salt as the precursor, by annealing the precursor film into molybdenum oxide film. The thickness of the thin film and the work function are adjustable. With the help of hole injection layer, the devices effectively reduced the incidence of the short circuit; Then studies are focused on the performance of devices fabricated by the solution method of the mixed multi-host and the spectrum changed depending on the dopped concentration in multi-dopant white devices;Second work is a step closer to vacuum-free process. We propose a way of heat transfer technology under low vacuum, reducing the requirement for the equipment and shorting the waiting time; At last, we introduce a lamination method under atmospheric conditions directly to make the aluminum electrode and organic film together.