A new type of light emitting diode which can emit light and absorb external light source

People do not have to touch the screen can be completely separated by hand gestures to operate the phone? Can also use ambient light to automatically charge? These black technology may be able to achieve in the near future, thanks to a new type of light-emitting diode (LED) array which can emit light and absorb external light source.

Researchers from the University of Illinois, Bana, Champaign and Marlborough, Massachusetts, Dow electronic materials company, recently in the United States "science" magazine published the relevant research progress. They show a new type of colloidal semiconductor nanorods, allowing a single device in the production of photoelectric effect to generate electricity at the same time, but also produce electroluminescence, the conversion of electric energy into light energy.

These nanorods with diameters less than 5 nm are made up of one of the three semiconductor materials, one of which is capable of emitting and absorbing visible light, and the other one is used to control the flow of charge in the first material. Three kinds of materials can work together to make the LED panel at the same time the illumination of the external light illumination and brightness adjustment.

Because of the frequency of the LED switching between the two functions of the light and the light, the naked eye can not recognize the switch, so the display panel is often bright. At the same time, the mobile phone is different from the light sensor, and the photometry of LED panel light occurs at the pixel level, it can not only adjust the brightness of the panel light source according to the external environment, but also bring the finger across the screen above the induction of fine light line difference, gestures to allow non touch screen.

The researchers also found that the LED in addition to the light, can absorb the external light and converted into current, similar to the solar panel function, therefore, the future of LED screen mobile phone can be charged by light, a self powered mobile phone.

In addition, this new LED display can also be used as a large parallel communication array, to achieve large data exchange between each other.

At present, researchers have successfully used the new red LED array demonstrates the related functions, trying to mix red, blue and green color LED color array display at the same time, by adjusting the composition of nanorod absorption capacity to improve LED.

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