lighting - Page 7

Grafoid signed a joint-venture development agreement with CapTherm Systems to develop and commercialize next generation, multiphase thermal management systems for electric vehicle (EV) batteries and LEDs. Grafoid will supply graphene materials and the technology needed to adapt graphene to CapTherm's existing EV and LED cooling systems.

CapTherm says that graphene's lateral and vertical heat spreading capabilities will enable them to develop more competitive products.

Researchers from Korea developed a new gold-doped graphene based transparent and current-spreading electrode (TCSE) for UV LEDs. Graphene was already studied as a conductive layer for UV LEDs, and now it turns out that doping it with gold improves the performance.  A gold-doped graphene LED features about 20% more emission compared to an ITO LED.

UV (300-400nm) LEDs are useful in several applications such as germicidal instrumentation, biological agent identification, chemical sensing, fluorescence excitation, and optical data storage. UV LEDs can also be used to emit white light (through phosphorescence).

Researchers from Korea and the USA developed a Ultraviolet nitride (UV) LED that uses a few layers of graphene as a transparent conducting layer. They say that Graphene may prove better than the currently-used ITO as it performs better in terms of cost, transparency, and, heat and current spreading. Graphene also sports improved transmission in the ultraviolet.

Graphene however suffers from reliability and degradation issues that must be further investigated.

Researchers from Sweden and the US have produced a new transparent lighting component that is made from Graphene. They say it is cheap to make and fully recyclable, and might be an alternative to OLED Lighting. The new device is called an Organic Light-emitting Electrochemical Cell, or LEC. The Graphene is used for an electrode. 

LECs can be made using a roll-to-roll process, because all of its parts can be made from liquid solutions.