For a long time, people did not use light-emitting diodes for lighting, mainly because light-emitting diodes usually can only emit red or yellow light. In order to obtain white light, light-emitting diodes that can emit blue light must be manufactured. In this way, after the red, yellow, and blue lights are “mixed”, white light is produced. This problem that plagued people has finally been solved.
Scientists have discovered a new type of semiconductor material-gallium nitride, which can emit blue light after being properly processed. After the problem of blue light is solved, there is hope for the problem of white light. Colin Humphreys of the Department of Materials of the University of Cambridge in the United Kingdom said that they have developed a white light emitting diode bulb in the experiment. The light emitted by this bulb is very close to sunlight and has good application prospects. He said that light-emitting diode bulbs are made of semiconductors. Therefore, this type of light-emitting device can be made very small, only a few millimeters. It can be installed on a wall or ceiling. If the light is not turned on, they are almost imperceptible. This eliminates the need for ordinary incandescent lamps to be equipped with a lampshade to prevent the light from dazzling the eyes.
