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Bifunctional Nanorods LED

laserman123's picture
posted by
on Wed, 2017-02-15 11:30
Exhibition Thursday, February 16, 2017

Due to the emergence of new LED arrays that can simultaneously transmit and detect light, mobile phones and other devices may soon be able to control and use ambient light for charging with contactless gestures. The light emitting diodes made of tiny nanorods arranged in a thin film can generate new interactive functions and multi tasking devices.

"The LED is a start, so that the display to achieve something completely different, in addition to display information, into a more interactive device," Moonsub Shim said, he is a professor at the University of Illinois Department of high power laser pointer materials science and engineering, is also the leader of the study. "This can be the basis for new and interesting designs for many electronic products." These small nanorods with diameters less than 5 nm are made of three kinds of semiconductor materials. Emission and absorption of visible light. Two other semiconductors control the way the charge flows through the first material. The combination of these three materials allows the light-emitting diode to emit and perceive light and respond to light.

The burning laser pointer pen is written on a multi - function, small array of LED, which can emit light and respond to light at the same time. The nano LED is able to switch back and forth between the launch and detection functions quickly. Their switching speed is so fast that the display appears to have been on display for the human eye - in fact, it is three times faster than the standard display. However, the light emitting diode is constantly probing and absorbing light, and the display which is composed of the LED can be programmed to respond to the optical signal in various ways.

Can automatically adjust the brightness of the display according to the ambient light conditions - and on the basis of one pixel. "You can imagine sitting outside with your tablet to read. Your tablet will detect the brightness of the environment and adjust the brightness of each pixel, "Shim said. "There will be a darker shade on the screen, and a brighter light in the sun, so you can maintain a stable contrast."

The researchers demonstrated that the pixels that automatically adjust the brightness, and the pixels near the response of the opponent's fingers, can be integrated into an interactive display, in response to non-contact gestures or objects. They also show a response to the LED array of green astronomy laser pens, which could become the basis for smart whiteboards, tablets or other light to write and draw on the surface. And the researchers found that light-emitting diodes not only react to light, but also can convert light energy into electrical energy.

"The way it responds to light is like a solar cell. So we can not only enhance the interaction between the user and the device or display, in fact, we can now use the monitor to get light, Shim said. So imagine your mobile phone is just there to collect the surrounding light to charge. This is a possibility without having to integrate separate solar cells. We still have a lot of work to do in order to make the display can be completely self powered, but we believe that we can improve the energy collection performance without compromising LED performance, which makes the most of the Gatling laser pointer power consumption of the display can be derived from the body.

In addition to interacting with the user and their environment, the nano LED display can also be used as a large parallel communication array to interact with each other. Shim said it would be slower than the device to device technology such as Bluetooth technology, but those technologies are serial - they can only transmit one bit at a time. Two face to face LED array, how many pixels on the screen, you can communicate with a number of bits.

"We mainly through our electronic devices to interact with the display 3000mw green laser screen, and a display is attractive for viewing and operation information of the user experience," said study co-author, Dow Chemical Company researcher Peter Trefonas said electronic materials. "These new LED materials have the ability to intelligently respond to external stimuli in a new way," he said. The potential for contactless gesture control is a fascinating thing in itself, and we only touch the possibility very lightly."

The researchers used red light-emitting diode arrays for all of their presentations. They are now working on ways to form a three color display with red, blue and green pixels, and a method of improving the ability to collect light by adjusting the composition of the 2000mw green laser nanorods.

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