KAIST's professor of physics research team successfully developed the technology to produce phosphor-free white LED, which is expected to be used in next-generation lighting and displays. At present, the majority of white LEDs combine blue phosphors with blue LEDs or white LEDs with a combination of multi-colored LEDs. However, yellow phosphor is a rare earth material, you must rely on imports, and the color is low, but also the possibility of discoloration. The combination of a variety of colors of LED high cost. KAIST research team to solve this problem, the semiconductor chip to replace the phosphor. The top of the concentric pyramid structure, designed as a composite structure. The fabricated 3D structures each formed a Quantum Wells under different conditions, each emitting a different color. The team explained how to adjust the time and conditions for making the 3D structure to change the area of ​​each crystal face to create a multi-colored LED. The team also found a way to measure the level of current injection inside a 3D structure using a high magnification microscope. As long as the development of a method that can effectively inject current, you can adjust the LED element efficiency and color reproduction. R & D team said that in the future through the development of 3D semiconductor process to improve efficiency, resulting in low-cost, high color reproduction single chip white light source without phosphor. Relevant research results published in the natural magazine Light: Science & Applications online version. Welded Wire Mesh,Stainless Steel Welded Wire Mesh,Mild Steel Welded Wire Mesh,Weld Mesh Anping Guangtong Hardware Wire Mesh Co.,Ltd , https://www.apguangtong.com