Technology | Oct 29, 2008

New efficieny record for OLEDs

MUNICH, Germany — A research group of the Dresden Technical University has achieved record energy efficiencies for OLEDs. The achievement brings the organic LED technology closer to industrial volume production. The research team achieved an efficiency of 26, 22 and 3.1 percent for red, green and blue organic LEDs which combined form a white light source.

The low efficiency for blue results of physical differences — while red and green OELDs are phosphorescent light sources, their blue counterpart is a fluorescent one, resulting in lower light emission. The difference, however, can be compensated for by increasing the active size of the blue light emitter as well as sending a higher current through it, explained research group member Rico Meerheim.

In any case, the efficiency achieved is significantly higher than what was hitherto possible, in particular for the red light source. The OLED created by the Dresden team achieved a light intensity of 81, 101 and 4 lumen per watt. The research was conducted in cooperation with Dresden-based OLED technology provider Novaled AG. A company spokesperson said the research results advances the OLED technology significantly. In comparison with silicon-based LEDs, Novaled claims OLEDs offer better displays with higher contrast, better color intensity, lower energy consumption, and an extreme viewing angle. In addition, OLEDs allow designers to build ultra-thin displays. Currently, only Japanese consumer electronics vendor Sony Corp. commercializes large OLED displays in a TV screen.

Besides computer and TV set displays, OLED are positioned for room lighting applications. The Novaled spokesperson declined to say to whom it licenses its technology. According to market researchers, the market for OLED materials will soon enter the boom phase. The OLEDs in question are manufactured at Fraunhofer ITMS in prototype volumes, Meerheim said.

Add comment

You can add a comment by filling out the form below. Plain text formatting. Comments are moderated.

Question: What is 1 + 4 ?
Your answer:
FEATURED

Luxeon V2, the Best Choice for a 2 mm² High Power LED

Luxeon V2, the Best Choice for a 2 mm² High Power LED Lumileds announced breakthrough high power performance with the new Luxeon V2 LED. With the highest performance in its class for output and efficacy, the emitter easily enables DLC Premium performance at the system level. Luxeon V2 utilizes a 2 x 2 mm Chip Scale Package (CSP) in a 3.5 x 3.5 mm ... Read more »

FEATURED

The 22nd China (Guzhen) International Lighting Fair

The 22nd China (Guzhen) International Lighting Fair China (Guzhen) International Lighting Fair is based in China Lighting Capital- Guzhen Town, where thousands of lighting manufacturers lies and is dubbed as the source of lightings. With the help of local government and UBM, the fair has been successfully held for 21 editions. Read more »

FEATURED

Edison Opto Introduces Breakthrough AC Module Series

Edison Opto Introduces Breakthrough AC Module Series Edison Opto Corporation, the leading LED lighting company based in Taiwan, introduces a wide range of AC modules. These AC modules can be broadly used in ceiling lights, mirror front lights, corridor lights, tri-proof lights, and down lights to meet different customers’ requirements. Read more »

EDITORIAL

High Conductive Foils Enabling Large Area Lighting

High Conductive Foils Enabling Large Area Lighting Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP as one of the leading partners for research and development for surface technologies and organic electronics and Sefar AG, a leading manufacturer of precision fabrics from monofilaments, developed a roll-to-roll ... Read more »

page_peel