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Advent of new nano-crystals to overcome the "flicker" strange phenomenon

In Electronic Infomation Category: R | on May   2, 2011

has the potential to make more expensive laser and U642B datasheet and LED

More than a decade, scientists have been trying to overcome the individual molecules will light "flicker" (blinking) the strange phenomenon to produce a continuous light. Recently, the Rochester (Rochester) University scientists finally found the basic physics behind this phenomenon, and U642B price and with the Eastman Kodak (Eastman Kodak) with the companys researchers can continue to hand to create a light-emitting nano-crystals. These findings make use of cheaper lasers with more and U642B suppliers and more bright LED lighting and tracking of drug and biomarker cells is no longer a dream.

Many molecules and nanocrystals can be absorbed or emitted photons, but sometimes they absorb the photon energy is converted into heat rather than the form of photon radiation to leave. These "dark" period during the normal radiation-emitting alternating randomly, so that molecular or microcrystalline look like in the flash. Luo Da Todd Krauss, professor of chemistry and Kodak, Naval Research Laboratory and Cornell University researchers have joined hands, hoping to find new, non-blinking nanocrystals.


new non- nanocrystal flash

Krauss, whos aim is to find a similar organic light-emitting diode (OLED) lighting, the new low-cost materials, but no such diode life is too short and not easily troubled manufacturing. They synthesized a variety of nanostructures composed of microcrystalline and found that one of the flickering is not expected, but after 4 hours of monitoring, this new no blinking nanocrystals, compared to a few flashes usually milliseconds to minutes intermittent.

After a long study, researchers concluded that the reason why flash does not occur because of this unusual structure of nanocrystals. General semiconductor nanocrystals central core, the outside coated with another semiconductor shell, core and shell the boundary between the clear-cut. In this new nano-crystals, the cadmium and selenium from the core to the shell of zinc and selenium is a continuous gradient was. This gradient inhibited hinder the process of photon radiation, it can be sustained and stable ceramic firing photons.

Krauss believe that this is not blinking nanocrystals, will the production of lasers and light sources become cheaper and easier. Currently, the laser must be of different colors in different materials and production processes, with this new nano-crystals, a single process can create any color of the laser. To change the color of light, engineers only need to change the size of nanocrystals can be. Similarly, in the plane, "painted" different crystallite size of nano-junction, you can create a display as thin as paper, or in any desired color illuminate the room wall. See 2009.05 Nature online edition.

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