Development of High-Efficiency and High-Reliability Organic Light-Emitting Diode Materials and Devices

Organic light-emitting diode (OLED) displays are commonly found in portable devices, monitors, and TVs used in everyday life. They offer superior performance compared to other displays, such as liquid crystal displays, in terms of lower power consumption and higher image quality, including wide color gamut, large contrast, and high still- and moving image resolution.

SEL is at the forefront of extensive R&D on OLED display technologies that provide high electro-optical conversion efficiency, low driving voltage, and long lifetime. One major achievement is the exciplex-triplet energy transfer (ExTET), an essential technology that is now widely used in OLEDs in commercially available smartphones and TVs.
The molecular structures of OLED materials are diverse and have a large number of substituents (partial structures). These substituents can be combined in many ways and structures with even slight differences significantly affecting the properties of OLED devices. For example, changes in driving voltage and electro-optical efficiency can drastically affect the power consumption of the end product. However, the molecular structure mechanisms behind these changes in OLED device performance are not yet fully understood. Therefore, elucidating the relationship between molecular structure and device properties is an essential topic that can contribute to improving the performance of OLED devices.