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Date: 14th July 2011

White organic LEDs with light output capability of 60 lumens/watt

Novaled has announced it has developed a highly power-efficient white OLED (Organic LED) structure delivering light output of 60 lm/W at a brightness of 1,000 cd/m2. These LED can long laster with lifetime of 100,000 hours at an initial brightness of 1,000 cd/m2 while using commercially available fluorescent blue emitting material.

The color rendering index (CRI) is also tested high of 87 for these LEDs. A very broad light emission spectrum and good CIE color coordinates (0.470/0.429) were achieved, which is close to illuminant A and inside the US Department of Energy (DOE) quadrangles meeting the DOE energy star color specifications, says Novaled.

Novaled said it has intentionally used a classical and commercially available fluorescent blue emitter material although the OLED power efficiency with such materials is usually much less than with phosphorescent emitters, but due to the advantages of the Novaled PIN OLED technology and proprietary materials a remarkably high value could be reached, claims Novaled.

The benefits of using fluorescent blue emitter material include:
It is commercially available;
It allows very good device stability and guarantees a higher lifetime of OLED devices;
Enables a broad coverage of the complete visible color range.

Novaled says the OLED sample incorporates Novaled light extraction technology and dedicated material NET 61 thereby enhancing the efficiency and improving the angular dependence of emitted light. By meeting the standards for commercial lighting applications, Novaled's new power-efficient white PIN OLEDs are already ideal for OLED lamps and luminaires for general and design lighting, suggests Novaled.

"Associating commercially available and robust fluorescent blue emitters with Novaled technology and materials leads to high OLED performances which meet major lighting market needs immediately", says Gildas Sorin, CEO of Novaled AG. "Once phosphorescent blue emitter materials become real commercial products our technology will allow for a further boost in OLED device efficiencies showing the way to exceed above 100lm/w and long life time."

Novaled said it has manufactured using standard processes to produce the white PIN OLED device structures. Standard glass substrates with ITO, ordinary evaporation processes and simple outcoupling methods allow for an easy adoption to existing manufacturing lines and for a cost efficient volume production of such devices, adds Novaled.


 
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