-26 September 2005 -

OLEDS reach 100,000 hour mark

Novaled (Dresden, Germany) has developed a red top emission OLED achieving 10lm/W at 500nits, with a projected lifetime of more than 100,000 hours.

Organic light emitting diodes that emit light away from the substrate (top emission type) are a key feature for future OLED applications. For displays, the top emission OLEDs increase the available light up to 50% while, when used in lighting applications, they make possible cheap, non-transparent and flexible substrates.

According to Novaled, it has achieved the highest power efficiency together with the longest OLED lifetime for top emission OLEDs by using its optimised transport layer doping technology.

The combination of a red phosphorescent emitter system from Covion Organic Semiconductors GmbH (Frankfurt, Germany) with the Novaled molecular dopant materials in the Novaled PIN structure resulted in a top emission OLED providing 10 lm/W with a projected lifetime of 100,000 hours at 500 nits.

This power efficiency for deep red CIE color coordinates (0.68/0.32) translates into 14 cd/A current efficiency and 3.0 Volt operating voltage. The lifetime measurement was carried out at a brightness of 3,500 nits in order to elevate the OLED aging process. At this starting brightness, 8,000 hours of continuous operation were determined