CDT Sees New Record Display Lifetime Development

Cambridge Display Technology (CDT) announced two major milestones in the development of long lifetime, high efficiency light emitting polymers for full color, video capable displays.

A phosphorescent red device has been produced by CDT and Sumitomo Chemical which has a lifetime of half a million hours from an initial luminance of 100cd/m²; this is a record for lifetime of solution-processable materials of any color.  The efficiency is also improved at over 7cd/A. Red efficiency is especially important as this color consumes the largest share of power input in a color device, so improvements in red efficiency have important practical implications.

The second major milestone announced is a lifetime of 150,000 hours for a fluorescent blue device based on a new material developed by CDT, and now part of the Sumation™ portfolio. Just eighteen months ago, CDT announced the achievement of 30,000 hours lifetime for fluorescent blue. The efficiency is also the highest recorded for a blue polyfluorene material at 10cd/A.

The new blue material yields very good color values and efficiency. The OLED industry has come to regard progress on blue materials as a key indicator, since this performance dictates the range of full color applications which can be implemented. The progress announced today gives a strong indication that the technology is moving rapidly to satisfy the requirements for applications including large display screens.