Displays

Siberian scientists couple graphene with nanodiamonds to create a unique lighting fixture

Scientists from the Novosibirsk Nikolayev Inorganic Chemistry Institute and the Krasnoyarsk Biophysics Institute have invented a new composite material made of graphene and nano-diamonds. By placing nano-diamonds on the surface of vertically aligned tubes of graphene (probably carbon nanotubes), the scientists created a unique composite material that glows under the impact of a weak electric field. 

The researchers say this is the prototype of a tiny light fixture, a nano-tube with a glowing nano-diamond on top. Such structures can be used in a variety of fields, from new types of displays to health diagnostics techniques.

Angstron Materials develops thermal foils for smartphones and electronic devices

Angstron Materials logoOhio-based Angstron Materials has developed a group of cost-effective thermal foil products that can be customized for handheld devices and other products. The company says that its foil sheets have been qualified for use by a major mobile electronics company. Such thermal foils can be used for the technology beneath devices' screens that conducts heat away from internal electronic components and batteries to help maintain optimal performance.

Angstron’s thermal foils are available in a variety of grades. The company states that its foils are thinner than other products on the market and so give manufacturers greater design flexibility than competing methods. Angstron’s foil sheets also can be sourced with equivalent or greater thermal conductivity.

The first graphene phone reportedly on the market!

Earlier this month, the first mass produced graphene-enhanced phone was rumoured to be near commercial sale by Chinese companies. Now, further details are available as it seems that the device is available on the company's website.

Galapad-settler-graphene-phone-image

The phone, called the Galapad Settler, is said to use graphene for its touchscreen, as well as casing and battery. 30,000 pieces were made by Chinese graphene company Moxi together with Chinese device maker Galapad, with each device selling for $399 USD.

Graphene's optoelectronic properties enable electrically controlling light at the nanometer scale

Scientists from ICFO, MIT, CNRS, CNISM and Graphenea collaborated to demonstrate how graphene can enable the electrical control of light at the nanometer level. Electrically controlled modulation of light emission is crucial in applications like sensors, displays and various optical communication system. It also opens the door to nanophotonics and plasmonics-based devices. 

Graphenea and MIT electrically Controlled Energy Flow into Photons and Plasmons image

The researchers managed to show that the energy flow from erbium into photons or plasmons can be controlled by applying a small electrical voltage. The plasmons in graphene are unique, as they are very strongly confined, with a plasmon wavelength that is much smaller than the wavelength of the emitted photons. As the Fermi energy of the graphene sheet was gradually increased, the erbium emitters went from exciting electrons in the graphene sheet, to emitting photons or plasmons. The experiments showed the graphene plasmons at near-infrared frequencies, which may be beneficial for communications applications. In addition, the strong concentration of optical energy offers new possibilities for data storage and manipulation through active plasmonic networks.

Will graphene adaptation 'GraphExeter' replace ITO?

University of Exeter scientists discovered that GraphExeter, an adaptation of graphene, is durable to prolonged exposure to high temperatures and humidity. This makes the material not only a transparent, flexible and lightweight conductor, but a resilient one at that. The scientists predict major importance of this discovery for various electronic applications (and a possible ITO replacement).

GraphExeter material image

GraphExeter is a University of Exeter discovery, and is made of sandwiched molecules of ferric chloride between two graphene layers. It turns out that this creates a unique conductor with many useful traits, which is also now proving to be durable: the researchers found that it can withstand relative humidy of up to 100% at room temperature for 25 days, as well as temperatures of up to 150C or as high as 620C in vacuum.

Flexible transparent graphene electrodes may enable electronic tattoos

Researchesr from Korea's Ulsan, KAIST and ETRI institutes developed a process that produces flexible transparent graphene electrodes that can be attached to the skin (or any kind of delicate object). This could enable applications such as electronic tattoo-like stickers or bio-signal sensors.

Transprent graphene electrodes on skin photo

A graphene metal fiber composite ise used, which lowers the resistance of the transparent electrode to approximately 1/20th of existing ones. This enables the electrodes to be used in flexible displays or sensors. The new process is similar to a widely-used semiconductor process which means that this can be scaled commercially.

Graphene may enable electrochromic displays

Electrochromic displays are made from materials in which the transmittance of light to be adjusted by applying a voltage. These work similarly to LCDs by letting light from a backlighting unit (BLU) pass or not and so show desired images. These kind of displays haven't been commercialized successfully yet due to fragile materials and material mismatches with the electrodes.

Graphene electrochromic device examples (Bilkent University)

But this may change now, thanks to graphene. Researchers at Bilkent University developed a graphene electrochromic device that demonstrated 55% modulation and a broad spectral response. Both the electrode and the electrochromic device are made from graphene, and this enables a high percentage optical modulation, optical tuning properties in the UV to infrared, good electrical conductivity with no material mismatches. The display is mechanically flexible.

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