Will the invention happen to stop the fate of the lights?

Imagine a street corner brightly lit, but not from the current long, twisted or round shadows, but from the sidewalk table, from the wall or even on the fork.

An accidental invention published last week raised the LED light to a new level, indicating that it could quickly become a cheaper alternative and a longer life-span than traditional light bulbs. .

The LED operates based on the photoelectric effect: the energy changes into photovoltaic when there is an electrical current flowing from the semiconductor layer p to the semiconductor layer n homogeneous or heterogeneous, the contact area of ​​the two layers will radiate radiation. variable. The advantage of this type of light is that the size of the LED is very small compared to the current light bulbs, only a few millimeters in size, low power consumption, can be connected with LEDs into long strip lights or clusters. LEDs have now been used in traffic lights, flash lights, and decorative lights. They are more flexible and less expensive than classic lamps.

White light emitted from Bowers' scrawny lamp. Michael Bowers, a graduate student at Vanderbilt University, is trying to create really small quantum dots, crystals just a few nanometers large. They are less than 1 thousand of human hair width. These quantum dots contain between 100 and 1,000 electrons. They are really dynamic energy packages, and the smaller the size, the higher the kinetic energy. Each dot in a Bowers batch is exceptionally small, containing only 33 to 34 pairs of atoms.

When lighting up quantum dots or passing electricity, they will react by glowing themselves, usually a brilliant color. But when Bowers shone the laser, something unusual happened.

" I was surprised to see a white light covering the table, " Bowers said. " Quantum dots are supposed to emit blue light, but they emit brilliant white light ," Bowers said.

Bowers and other students then came up with the idea of ​​dipping quantum dots into polyurethane and wrapping the mixture outside a blue LED light bulb. The lumpy shadow looked pretty ugly, but it produced a white light similar to a normal light bulb.

The new device emits warm, slightly yellowish white light, has twice the brightness and 50 times the lifespan of a standard 60 watt light bulb.

If this process can be developed into commercial products, the light will not only be emitted by the light bulb. Quantum dots mixes can be painted on anything and are electrically activated to create colorful rainbows.

T. An ( according to LiveScience )