Tsinghua University produces a tunable graphene LED with a large spectral range

The research team led by Ren Tianling, a professor of micro-nano electronics at Tsinghua University, has recently produced a new type of luminescent material from two different forms of graphene. The first time in a graphene-based luminescence system, it has been shown that it can be adjusted with only one LED. Light of different colors covers almost all colors of the entire visible spectrum.

The color and wavelength of the illuminating diodes (LEDs) are determined by the luminescent material. Once prepared, the two properties are determined. So far, the idea of ​​using an LED to change the color of a light is difficult to achieve. The tunable graphene LED developed by Ren Tianling's research team covers red light from 450 nm wavelength to 750 nm wavelength, except dark blue and violet.

Tsinghua University produces a tunable graphene LED with a large spectral range

New graphene material LED covers almost the entire visible spectrum

The key material for realizing adjustable color LEDs is graphene. From solar cells to semiconductors, graphene has achieved certain results as an emerging material. However, LED lamps made with this material have not achieved color adjustment until this time. Researchers turn this into reality.

In the conventional display or illumination technology, the existing LED device expresses the color or synthesizes white light by adjusting the brightness of the three primary color light-emitting units of red, green, and blue. This breakthrough research results in color fidelity while significantly reducing the number of light-emitting units in the display device, thereby greatly optimizing the circuit and reducing power consumption.

According to a recent report by Tsinghua University News Network, this new type of LED has broken through the color synthesis method of existing display devices, and is expected to have a revolutionary impact on display screens, lighting fixtures and communication technologies. Since the color of light varies with specific chemicals, such devices may also be used to make special sensors. The reviewer of the paper commented: "This work is expected to open up new research directions in the field of light-emitting devices." "This work is exciting and influential."

The research results were published online in Nature·Communication. Wang Xiaomu, a postdoctoral fellow at Yale University, and Tian He, a Ph.D. student at the Department of Micro-Nano Electronics, Tsinghua University, are co-first authors of the paper.

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