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Graphene gets bright,World`s brightest light bulb.

2015-11-26 17:10:44 Source:admin Editor:

The research of the new electronic materials "graphene" has been studied all over the world in recent years, the world`s research institutes and experts have published correlation research findings and achievement constantly and use this new electronic materials "graphene" in the field of lighting this year. Graphene light bulb as the best light bulb gets bright .Mr Chen, the engineer of professional connector agent First Green Trading Ltd, focuses on the trend and the future development of the application of "graphene" in lighting field. The following is his collection of relevant news through Internet

Graphene light bulb is cheaper than traditional LED bulb.

According to the latest news of BBC, the National Institute of graphene in the UK, University of Manchester, has developed a new graphene light bulb, with more strong structure and lower price than the LED light bulb.

Due to the environmental protection, energy saving and long service life of the LED lamp, laws was enacted to ensure LED bulb quickly replace the traditional incandescent light bulbs in many countries. At this time, the new graphene light bulb will bring lighting technology innovation again and expected come to market in 2015.

The new type of graphene light bulb is still based on LED technology, not only their performance and service life greatly is enhanced by the magic of graphene molecules, but also is expected more cheaper than LED bulbs。Using a filament-shaped LED which is coated in grapheme the bulb, which is dimmable, use up to 10 percent less energy and last longer owing to its conductivity.

The Institute said the project was started in March 2015, and is stepping up efforts to expand sales of graphene light bulbs, also strive to keep them cheaper than the traditional LED light bulbs by cutting cost.

Nanjing University of Science and Technology use graphene to cut the high cost of LED lights.

Nanjing University of Science and Technology said they had made key breakthroughs in designing new two-dimensional semiconductor,and expected to create new materials that greatly reducing the cost of LED lamp production, which was published in Angewandte Chemie International Edition, a top journal in fields of Chemistry and Material. The article was also chosen as Hot Paper and Journal Cover by Nature、Nan oWerk and other academic media.

“The LED lamp on the market,can not used widely in people`s homes attribute to the price several times higher than ordinary lamps. The common, low cost new materials such as graphene are very suitable for the manufacture of energy devices and LED. However, the metal, semi-metallic properties of these materials, became its fatal flaw. It`s a big problem to change the properties of these materials in material field.” said Haibo Zeng, the director of Institute of Optoelectronics and Nanomaterials,

“Manufacturing LED is just one aspect of this new material, the material also can replace silicon, applied to the computer, mobile phone chip, Once applied, the Google glasses, intelligent health bracelet and other wearable electronic devices Not only their performance greatly enhance, but also will be more thin and small ,more affordable. " said Haibo Zeng.

World`s Thinnest Light Bulb Created from Graphene.

Over 130 years ago, Thomas Edison used carbon as the conducting filament in the very first commercial light bulb. Now a team of scientists and engineers from Columbia University, Seoul National University (SNU), and Korea Research Institute of Standards and Science (KRISS) have used that very same element, in its perfectly crystalline form of graphene, to create what they claim is the world`s thinnest light-bulb. Even though just one atom thick and covering an area almost too small to see unaided, the new device is so bright that the light it produces can easily be seen with the naked eye.

Using tiny filaments of graphene attached to metal electrodes, with these strips then suspended above a silicon substrate. Passing current through the filaments caused them to heat up to over 2,500° C (4,500° F) and produce an exceptionally bright light.

"We`ve created what is essentially the world`s thinnest light bulb, this new type of `broadband` light emitter can be integrated into chips and will pave the way towards the realization of atomically thin, flexible, and transparent displays, and graphene-based on-chip optical communications." said James Hone, professor of Mechanical Engineering at Columbia.

Interestingly, the ability of graphene to reach such elevated temperatures without melting either the underlying substrate or the metal electrodes is because, as graphene is heated up, it is less able to conduct heat away from itself.

As a result, the concentration of heat is limited to the very center of the filaments and an exceptionally intense light is produced. Measuring the spectrum of light emitted from the new device, the researchers also discovered that it peaked at wavelengths not expected to be seen. This was a result of interference between the light being generated directly by the glowing filaments and light bouncing off the silicon substrate and back through the graphene filaments themselves.

This phenomenon is only possible because graphene is transparent, unlike any conventional filament, and allows us to tune the emission spectrum by changing the distance to the substrate.

A graphene lattice is also a particularly efficient way to produce light, due to its inherent ability to maintain excitation levels that allow the freer flow of electrons. That is, just as graphene is able to rapidly emit electrons when excited by lasers as the electrons remain at an elevated state. It also provides a similar capability for efficient photon release in an electrically-heated situation.

"At the highest temperatures, the electron temperature is much higher than that of acoustic vibrational modes of the graphene lattice, so that less energy is needed to attain temperatures needed for visible light emission," said Myung-Ho Bae, a senior researcher at KRISS. "These unique thermal properties allow us to heat the suspended graphene up to half of the temperature of the sun, and improve efficiency 1,000 times, as compared to graphene on a solid substrate."

As such, the researchers are currently working on ways to improve the performance of these incandescent devices in finding out how quickly they might be toggled on and off so that they may be used to generate ones and zeroes in optical communication. They are also exploring methods for incorporating them into flexible materials.