The Development Prospects Of LED Bulbs

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, University of Cambridge, UK, said that they have developed white light emitting diode bulbs in experiments. The light emitted by such bulbs is very close to sunlight and has good application prospects. He said that light-emitting diode bulbs use semiconductors as materials. 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 piercing the eyes. In addition, this kind of light bulb has a long lifespan, and it hardly needs to be replaced after it is installed. People may forget how to change the light bulb in the future. He is calling on the British government to increase investment to ensure that the UK can lead the way in this technical field. In addition to being durable, this light bulb also has great potential for energy saving. According to calculations, if half of the light bulbs in the United States use light-emitting diode bulbs, 24 power stations can be shut down, billions of dollars saved, and carbon dioxide emissions will also be significantly reduced. Because of this, the United States has planned to use light-emitting diode bulbs for all traffic lights by 2006, so that each intersection can save $750 a year. Despite the many benefits of this kind of light bulb, there are still two major obstacles to getting into ordinary households. One is that the price is too high. The price of each bulb is 30 pounds, while the ordinary incandescent bulb is only 35 pence, the difference is too big. Second, it is still difficult to produce white light bulbs suitable for household use.