In Michigan as Reuters research team published November latest research, found that the chemical elements are boron (the Boron) was added indium gallium nitride (InGaN) material may allow the LED semiconductor intermediate layer (middle layer) thickness is increased, the light emission efficiency with solution The phenomenon that the injection current increases and decreases. This research has been published in Applied Physics Letters. A light-emitting diode semiconductor is composed of a P-type semiconductor with positively charged properties and an N-type semiconductor with electrons. A hole having a positive electrical property after being energized is combined with an electron and generated. Light, the material used in the middle layer will determine the length of the wavelength. When electrons and holes move to the middle layer, too many electrons are simultaneously extruded into the middle layer, causing them to collide with each other, failing to effectively combine with the holes, and reducing the luminous efficiency, which is called European. Auger recombination. The solution to this problem is to increase the thickness of the intermediate layer so that there is enough space for the electrons and holes; however, it is not as easy to increase the thickness of the intermediate layer. Since the LED semiconductor is crystalline, there is a fixed arrangement rule between the atoms, and this specific pitch is also called a lattice parameter. When the crystal materials are stacked on each other, their lattice parameters must be similar, and the atomic arrangement rules can be matched with the material joints, otherwise the material will be deformed. Researchers Williams and Kioupakis found through prediction models that adding boron to indium gallium nitride can increase the thickness of the intermediate layer to facilitate electron and hole bonding. The wavelength of light emitted by the BInGaN material is also very close to the wavelength of indium gallium nitride, which can be adjusted to different colors. Whether the research can actually be produced in the laboratory is still unknown, and how much boron is to be incorporated is also a challenge, but the findings of the Michigan research team are a major contribution to the development of new LEDs. Editor: Yan Zhixiang
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