Simplified Organic LED for beautiful color lighting with low cost
Prof. Hsin-Fei Meng (孟心飛)
Institute of Physic, National Chiao Tung University
Date 2020.03.24 (Tue)
Organic light-emitting diode (OLED) is a new planar light source with beautiful color. The light is emitted by organic molecules and has a broad spectrum, in contrast to the sharp spectrum of inorganic LED. Conventionally OLED is made by vacuum evaporation to form a multiple structure, including at least hole injection, hole transport, emission, and electron transport layers. In order to achieve a balance between electrons and holes, there are often more than five layers with total thickness around 100 nm. Such complicated structure is expensive and cannot be applied for large area lighting. The structure is also difficult to make by the low-cost solution coating methods. We proposed and demonstrated a simplified OLED structures with only hole transport and a mixed-host emission layer. The electron and hole balance and the color tuning are achieved by the mixing ratio. Stable and beautiful OLED panels with various nice colors are made by solution process using blade coating.