Organic light-emitting diodes

A community portal about Organic light-emitting diodes with blogs, videos, and photos. According to Wikipedia.org: An organic light-emitting diode is a special type of light-emitting diode in which the emissive layer comprises a thin-film of certain organic compounds. The emissive electroluminescent layer can include a polymeric substance that allows the deposition of very suitable organic compounds, for example, in rows and columns on a flat carrier by using a simple "printing" method to create a matrix of pixels which can emit different colored light. Such systems can be used in television screens, computer displays, portable system screens, advertising and information, and indication applications etc. OLEDs can also be used in light sources for general space illumination. OLEDs lend themselves for the implementation of large areal light-emitting elements. OLEDs typically emit less light per area than inorganic solid-state based LEDs which are usually designed for use as point light sources. Prior to standardization, OLED technology was also referred to as OEL or Organic Electro-Luminescence.

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University of Utah suggest study to make highly efficient light-emitting diodes LEDs using organic materials

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From: oled-display.net

Toward Plastic Spin Transistors and Organic LEDs

But Study Hints Efficient Organic LEDs Will Be Tough to Make
University of Utah physicists successfully controlled an electrical current using the "spin" within electrons - a step toward building an organic "spin transistor": a plastic semiconductor switch for future ultrafast computers and electronics.

The study also suggests it will be more difficult than thought to make highly efficient light-emitting diodes (LEDs) using organic materials. The findings hint such LEDs would convert no more than 25 percent of electricity into light rather than heat, contrary to earlier estimates of up to 63 percent.

Organic semiconductor or "plastic" LEDs are much cheaper and easier to fabricate than existing inorganic LEDs now used in traffic signals, some building lighting and as indicator lights on computers, TVs, cell phones, DVD players, modems, game consoles and other electronics.

The study - published online Sunday, Aug. 17 in the journal Nature Materials - was led by Christoph Boehme and John Lupton, assistant and associate professors of physics, respectively, at the University of Utah.

The promising news about spin transistors and sobering news about organic LEDs (OLEDs) both stem from an experiment that merged organic semiconductor electronics and spin electronics, or spintronics, which is part of quantum mechanics - the branch of physics that describes the behavior of molecules, atoms and subatomic particles.

"This is the first time anyone has done really fundamental, hands-on quantum mechanics with an organic LED," Lupton says. "This is tough stuff."

Lupton and Boehme conducted the study with postdoctoral researcher Dane McCamey and four University of Utah physics doctoral students: Heather Seipel, Seo-Young Paik, Manfred Walter and Nick Borys.

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