development required to create white light LEDs, which use less power and last longer than traditional devices that emit white light. White LEDs are incorporated in the smartphones and computer screens that we all use every day.
The breakthrough in the research work came with the production of high-quality gallium nitride which is in many layers of the blue LED device, structured to enable efficient light emission. The red and green LEDs previously developed used gallium phosphide, a far easier chemical to produce. A white LED is simple to make from a blue one, by exciting a fluorescent chemical in the lightbulb which changes the blue light to white light.
A modern white LED is a highly efficient device which converts more than 50% of the electricity input into emitted white light, compared to only about 4% efficiency in conventional incandescent lightbulbs. LEDs can last 10 times longer than fluorescent lights and 100 times longer than incandescent lightbulbs. Using LEDs in houses and commercial buildings helps to significantly reduce the lighting-based electricity needs, around a quarter of all generated power. As the LEDs only require a low amount of energy to function, they could operate using cheap solar power, giving the possibility of providing better lighting to some 1bn people without access to the main electricity grids.
Nakamura's and Akasaki's groups will continue work on making even more efficient blue LEDs. In future, scientists may be able to develop white LEDs that work by combining red, green and blue LEDs, which would mean a light which could provide a range of colours across the spectrum.
development required to create white light LEDs, which use less power and last longer than traditional devices that emit white light. White LEDs are incorporated in the smartphones and computer screens that we all use every day.
The breakthrough in the research work came with the production of high-quality gallium nitride which is in many layers of the blue LED device, structured to enable efficient light emission. The red and green LEDs previously developed used gallium phosphide, a far easier chemical to produce. A white LED is simple to make from a blue one, by exciting a fluorescent chemical in the lightbulb which changes the blue light to white light.
A modern white LED is a highly efficient device which converts more than 50% of the electricity input into emitted white light, compared to only about 4% efficiency in conventional incandescent lightbulbs. LEDs can last 10 times longer than fluorescent lights and 100 times longer than incandescent lightbulbs. Using LEDs in houses and commercial buildings helps to significantly reduce the lighting-based electricity needs, around a quarter of all generated power. As the LEDs only require a low amount of energy to function, they could operate using cheap solar power, giving the possibility of providing better lighting to some 1bn people without access to the main electricity grids.
Nakamura's and Akasaki's groups will continue work on making even more efficient blue LEDs. In future, scientists may be able to develop white LEDs that work by combining red, green and blue LEDs, which would mean a light which could provide a range of colours across the spectrum.
การแปล กรุณารอสักครู่..