This technology is system for light emission from electrically biased graphene that is bright, fast, and stable at high-temperatures.
While light emitting diodes (LEDs) have revolutionized display technologies for consumer electronics and related applications, some systems have limitations such as instability at high temperature, energy loss by down conversion, toxicity of phosphorous, and low-speed light modulation. Graphene, a two-dimensional carbon film one atom thick, possesses many useful optoelectronic properties that make it appealing for use in display technologies. However, current methods for light emission from graphene can be limited to the infrared range, or are inefficient in energy conversion to light due to heat dissipation and significant hot electron relaxation. As such, there is a need for methods that improve the brightness and efficiency of light emission from graphene for use in displays.
This technology is a system for efficient and robust visible light generation from graphene. This technology takes advantage of graphene’s strength and stability at high temperatures to generate spatially localized electrons. The spatial localization of electrons is achieved by inhibiting heat dissipation from the graphene, either by suspending it using insulating mechanical clamps or by encapsulating unsuspended graphene in an insulating material such as boron nitride. This leads to a 1000-fold increase in the efficiency of thermal radiation from these devices. In addition, the emission spectrum of the devices can be tuned by taking advantage of the optical interference between the graphene and its substrate, highlighting the versatility of this technology.
The scalability of this technology has been demonstrated using arrays of graphene generated using chemical vapor deposition (CVD).
Patent Pending (US US20170294629)
IR CU15107
Licensing Contact: Richard Nguyen