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OLEDs mimic natural light for vivid, healthy illumination

OLEDs mimic natural light for vivid, healthy illumination

Technology News |
By eeNews Europe



The researchers – led by Jian Li, an associate professor of materials science and engineering in the Ira A. Fulton Schools of Engineering at Arizona State University – are focusing on developing OLEDs that would not emit ultraviolet (UV) light, which will not only enable clearer vision but also will prevent eyestrain that often results from continuing exposure to the UV light emitted by current devices.

The OLEDs will benefit museums, art galleries and similar places, since UV light inhibits the human eye in clearly discerning color variations and the texture of objects. Over time, UV light also actually dulls colors of paintings by causing slow decomposition of the paints and other materials.

The research team has received a grant providing $875,000 over two years from the U.S. Department of Energy to allow Li’s lab to expand its research and further develop its collaboration with Universal Display Corporation, a leading developer of electronic display and lighting technologies based on organic materials.

An organic light-emitting diode is a light-emitting diode (LED) that employs conjugated organic molecules to transport electrical charges and emit light in response to the electric current. The typical thickness of a whole OLED is less than 1 micrometer, which can be transparent and compatible with the flexible substrates.

“This technology will offer many benefits over our conventional lighting devices,” claimed Li.

Advanced OLEDs will enable more control of the brightness of lighting, along with providing more options to mold the shapes of the lighting devices, to pinpoint the direction and intensity of light, and to control the color of light.

The image of single-doped organic light-emitting diodes (OLEDs) shining a high-quality white light on a Magic Cube shows how OLEDs can vividly illuminate the colors of the cube across the full range of the visible color spectrum from blue to green, yellow and red. ASU engineer Jian Li’s research team is working to develop a cost-effective solution for the next generation of solid-state lighting products based on OLED technologies. Photo courtesy of Jian Li’s research group.

Li’s research team is working to develop OLEDs that use a single emissive material to create a white emission – rather than more complex structures that rely on the use of combination of blue, green and red emissive materials – designed to emit a more operationally stable and pure white light than other lighting technologies.


Achieving this requires the design and utilization of a class of emissive materials that can produce a blue emission in a single molecular form and produce an orange emission with two molecules stacked on each other. The precise control of both the blue and orange emissions can produce a high-quality white light for indoor illumination.

If successful, the new OLED devices will be less complicated and less costly to manufacture, and offer increased efficiency and longer lifespans because they would need less power to operate. That accomplishment would effectively pave the path to relatively rapid commercialization, Li said.

Universal Display Corporation will help with building device prototypes and with product testing.

Related articles and links:

www.asu.edu

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BMW’s fastest production road car premieres OLED technology

DuPont Displays scales up OLED materials facility for next-gen TVs

UV OLED development creates all organic on-chip spectrometer

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