Recently, the United States of America Georgia Institute of Technology researchers using zinc oxide nanowires dramatically improving gallium nitride light-emitting diode ( LED Lights ) the current into the effectiveness of ultraviolet light. LED high bay This device is believed to be the first by a piezoelectric photoelectric effect in piezoelectric material generated in charge, led lighting brisbane, so that their performance sharply LED. Relevant studies published in the recent publication of” nano letters” magazine.
The nanometer line applying mechanical strain, researchers at the Georgia Institute of Technology where manufacturing piezoelectric potential. The potential is used to adjust the charge transfer, and enhanced LED carrier injection. The piezoelectric potential for photoelectric equipment control is referred to as the piezoelectric effect. led lighting brisbane, This effect can increase the electrons and holes recombine to produce photon rate, and by improving the luminous intensity and increase the injection current, strengthen equipment external efficiency, improve them as much as 4 times.
The school of materials science and engineering department director Professor Wang Zhonglin said, from the actual situation, the new effect of photoelectric process have many influences, including improving the energy efficiency of lighting device. The traditional LED general use quantum well structure trapped electrons and holes, which requires both long time stay close enough to restructure. led lighting brisbane, Electron and hole near the longer, the higher the efficiency of LED device. Although the general LED internal quantum efficiency can reach 80%, but traditional single p-n node in LED lighting Products thin external efficiency is only 3%.
New device of zinc oxide nanowires formed p-n node n, gallium nitride film can be as one of the P. Free carrier will be imprisoned in the interface region. Piezoelectric photoelectric effect can be applied to equipment0.093% compressive stress situations, led lighting brisbane, so that the luminous intensity to promote 17 times, make the node current increases 4 times, so that the photoelectric conversion rate is improved about 4.25 times. In the appropriate external stress under the action of the new device, the external efficiency can reach 7.82%, much higher than the traditional LED external quantum efficiency.