OLED Materials

OLED: State-of-the-art display

These days, OLED display technology is gaining more and more attention. This next-generation flat panel is extremely thin, and is seen as a clear departure from both LCD and plasma display technologies.
Hodogaya Chemical has developed Hole Transport Materials (HTM) and Electron Transport Materials (ETM) for OLED applications using our long experience in synthesis technologies, including ultrapure organic chemicals such as Organic Photo Conductor (Charge Transport Materials), as well as computer-based molecule design technology. Other OLED materials such as Emitting Materials and Hole Injection Materials are under development. Our unique OLED materials will help to extend the life and stability of OLED devices.
As a leading manufacturer of OLED materials, the Hodogaya Chemical group supplies materials to major panel manufacturers both in Japan and overseas.



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Basic Principles of OLED Technology

‘EL’ stands for electroluminescence. Organic EL is a light emitting system featuring organic compounds that emit light when electric current is applied.
An OLED display is a laminated construction, which consists of three layers, namely a hole transport layer (HTL), an emitting layer (EML) and an electron transport layer (ETL). The HTL transports holes (plus), the ETL transports electrons (minus), and the holes and electrons are brought into the EML, and combined to emit light.

OLED System
Hodogaya Chemical’s core technology

Hodogaya Chemical manufactures mainly Hole Transport Materials (HTM) that are used in the hole transport layer. HTM technology is based on Charge Transport Materials (CTM) which were developed for electrophotography and printers.
We are also developing Electron Transport Materials (ETM) for use in the electron transport layer, and other materials. From dyestuffs to imaging materials, and from imaging materials to OLED materials, Hodogaya Chemical is charting its course along with the flow of the times.

※Charge Transport Materials (CTM): Materials for the Organic Photo Conductor (OPC) drums that are a key component of electrophotographic copiers and printers.


The Future of OLED Technology

OLED displays are thinner than LCD and other displays, and offer vivid colors and sharp reproduction of even rapidly moving images. These features have been drawing a great deal of attention. However, due to technical issues such as short lifetime and size limitations, OLED technology has been used only in smaller displays such as cellular phone sub-displays and mono-color MP3 player sub-displays so far.
Recent technical developments have made it possible for the technology to be used in the main display of cellular phones and televisions. OLED displays have been used in various cellular phones since 2007, and are expected to be more widely applied in more types of cellular phones in the near future. The first OLED television was commercialized in December, 2007.
Currently, progress is being made in developing larger format OLED displays. This application have great future potential.