LED tagged posts

The fiber sensor. Credit: ETRI

The researchers, from Electronics and Telecommunications Research Institute and Konkuk University in the Republic of Korea, coated cotton and polyester yarn with a nanoglue called bovine serum albumin (BSA). The yarns were then wrapped in graphene oxide sheets.

The graphene sheets stuck very well to the nanoglue – so much so that further testing showed the fabrics retained their electrical conducting properties after 1,000 consecutive cycles of bending and straightening and 10 washing tests with various chemical detergents. Finally, the graphene oxide yarns were exposed to a chemical reduction process, which involves the gaining of electrons.

The reduced-graphene-oxide-coated materials were found to be particularly sensitive to detecting NO2, a pollutant gas ...

“It can potentially revolutionize lighting technology,” said Assistant Professor of Industrial and Manufacturing Engineering Zhibin Yu. “In general, the cost of LED lighting has been a big concern thus far. Energy savings have not balanced out high costs. This could change that.”

Yu developed this new LED technology using a combination of organic and inorganic materials. The material, which dissolves and can be applied like paint, shines a blue, green or red light and can be used to make a light bulb. But what makes it really special is that it’s far simpler to manufacture than existing products on the market.

Most LED materials require engineers to put 4 or 5 layers of material on top of each other to create the desired product or effect. Yu’s material only requires 1 layer.

The res...

The Next Generation Wearable Display Using Fiber Based Light Emitting Diodes. Credit: Copyright KAIST

Professor Kyung-Cheol Choi and his team from the School of Electrical Engineering at KAIST have developed fiber-like LED’s, which can be applied in wearable displays. Traditional wearable displays were manufactured on a hard substrate, which is later attached to the surface of clothes. Such technique has posed limitations in applying it for wearable displays because inflexible displays were not adequate in practice, and the characteristics of fabric were ignored.

Dip-Coating Process to Create Fiber-Based Light-Emitting Diodes

Solution? They focused on fibers, a component of fabrics, and developed a fiber-like light emitting diode that has the characteristics of both fabrics and displays...

This schematic illustrates the novel nanosheet with three parallel segments created by the researchers, each supporting laser action in one of three elementary colors. The device is capable of lasing in any visible color, completely tunable from red, green to blue, or any color in between. When the total field is collected, a white color emerges. Credit: ASU/Nature Nanotechnology

More luminous, energy efficient than LEDs, white lasers look to be the future in lighting and Li-Fi, light-based wireless communication. Arizona State Uni researchers proved semiconductor lasers can emit over the full visible color spectrum: necessary to produce a white laser.

They created a novel nanosheet – thin layer of semiconductor ~1/5 of the thickness of human hair in size -with 3 parallel segments, eac...