Idemitsu, Sony Develop Blue OLED w/ 28.5% Internal Quantum Efficiency

E-Mail Article
Printer-Friendly
Tweet This
Digg This
Share this with friends on Facebook
Buzz Up!
May 20, 2008 18:22 Tetsuo Nozawa, Nikkei Electronics

Idemitsu Kosan Co Ltd and Sony Corp announced May 19, 2008, that they jointly developed a blue OLED device and confirmed an internal quantum efficiency of 28.5% and an emission lifetime of more than 30,000 hours.

The new device is the world's highest level of luminous efficiency for a fluorescent light-emitting material, the companies said. It will be presented at the Society for Information Display (SID2008), which is currently taking place in Los Angeles.

According to the companies, the latest achievement is a result of combining Idemitsu's luminescence and other OLED materials, and Sony's proprietary device structure called "Super Top Emission." The light emitted from the new device has the CIE chromaticity of (0.137, 0.065). The device reportedly emits blue light, which is deeper than that of the NTSC standard, (0.14, 0.08).

After conducting a continuous emission test in an environment at a temperature of 50°C with the initial luminance set to 200cd/m2, the companies discovered that the emission lifetime (luminous half decay time) of the latest device substantially exceeds 30,000 hours. The luminance per unit current is 3.9cd/A.

The technology is expected to reduce the power consumption of blue OLEDs, the most energy-intensive of the three primary RGB colors, contributing to the future development of medium- to large-size OLED TVs.

NIKKEI ERECTRONICS ASIA

November 2009November 2009 cover story

AR to Realize World of Science Fiction

October 2009October 2009 cover story

Noise Above 1GHz Emerging as Threat

September 2009September 2009 cover story

More Competitors Enter Netbook Market

Nikkei Electronics Asia magazine is available each month free of charge to engineers, managers and other qualified readers.