Currently most of the white LED is a combination of yellow phosphor blue LED, or side by side to create a multi-color LED white LED. However, the case of rare earth yellow phosphor material to be imported and played less color, but also the possibility of discoloration. The combination of multi-color LED costs relatively high.
KAIST research team in order to solve this problem, a semiconductor chip replace phosphor. Top concentric pattern pyramid structure, design a composite structure. The surface of each manufactured in different conditions of 3D structures formed quantum well (Quantum Wells), each emit a different color.
The research team explained, adjusting the production structure of 3D time and conditions to change the way each crystal surface area, creating a diverse color mixing LED.
The research team also found a high multiple microscope can be used to measure the internal structure of the current injection level 3D method. The method can be effectively injected current as long as the research and development, you can adjust the LED element efficiency and color reproduction degrees.
Research and development team, said the future through 3D semiconductor manufacturing process can improve the efficiency of research and development, the birth does not use phosphors low-cost, single-chip color reproduction and high white light source.
