The fire began the first revolution in the field of human lighting, and the incandescent lamp invented by Edison is recognized as the second revolution in the field of lighting, and the semiconductor lighting called LED will undoubtedly lead the third revolution in the field of human lighting.
There is a legend in China that there is a car sac in the night, and there is an illuminator in the tail of the firefly. The main substances in the luminescent cells are luciferin and luciferase. Insect fluorescein is the source of light energy, and luciferase is the catalyst. The efficiency of luciferin conversion energy is very high. Only about 2%-10% of the energy is wasted on the heat energy, and the rest of the energy is used to emit light. Therefore, the firefly's luminescence can be called a "cold light", physicist. Think this is a very ideal light.
Until October 21, 1879, in a dusty laboratory in New Jersey, USA, Edison sealed a very thin carbon fiber in a glass bubble and used a vacuum pump to pump the air out of the glass bubble. The voltage is supplied steadily, turning the filament into a very stable bright light source, and the era of electric lighting has come. Although incandescent bulbs have been modified to suit specific needs, they can be subdivided into general-purpose lamps, high-voltage and low-voltage lamps, halogen lamps, and infrared lamps. But in general, incandescent bulbs can not meet the needs of human beings as large rooms or large-scale space lighting equipment, but the invention of electric lights has occupied a very important position in the history of human science for more than a hundred years.
Fluorescent lamps can be said to be a very important invention for indoor lighting. Most of the nighttime indoor lighting in the world is now fluorescent. Compared with the traditional light bulb, the fluorescent tube has the advantages of long service life, high luminous efficiency, large illumination area, and can be adjusted into different light colors. The use of fluorescent lamps meets the needs of most human occasions. Although various types of electric lamps are still under development, as of the 20th century, it is still impossible to develop inventions that are more in line with human needs than fluorescent lamps. Although fluorescent lamps have many advantages, the biggest disadvantage is that fluorescent tubes consume a lot of power, and most of the electrical energy is consumed in thermal energy. In addition, the mercury in the lamp has the problem of polluting the environment. Therefore, it is always the task of scientists and the business community to seek new illumination sources.
Light-emitting diodes that began to develop in the late 20th century will bring dawn to the future. In 1996, based on GaN blue light-emitting diodes, Nichia Corporation of Japan developed a yellow LED to excite yttrium aluminum garnet phosphors to produce yellow fluorescence. The resulting yellow fluorescence is then mixed with blue light to produce white light (blue LED with YAG). Phosphor) has opened the curtain for LEDs entering the lighting market.
The main structure of a white light-emitting diode consists of a diode at the bottom, a phosphor coated on a diode or a lampshade, and a lampshade that isolates the outside. When the bottom diode (usually a semiconductor material) is excited by electrical energy, an electron-to-hole pair is generated. When the electron is recombined with the hole, the diode emits a first emitted light (ultraviolet light or blue light). The first emitted light can be absorbed by the phosphor and converted into a second emitted light (visible wavelength range), and when the first emitted light that is not absorbed by the phosphor and the second emitted light emitted by the phosphor are mixed, White light.
With the use of different phosphors, LEDs can also have different colors of light or warm colors like fluorescent tubes. In addition, after years of research and development, it has been found that the use of high-efficiency ultraviolet light-emitting diodes as the light source is the future choice for white light-emitting diodes to become lighting devices. Therefore, how to develop high-efficiency ultraviolet light-emitting diodes and phosphors suitable for ultraviolet light is the goal of everyone today.
With the advancement of LED technology, the application of white LEDs has gradually developed, including indicator lights, portable flashlights, LCD screen backlights, automotive instrumentation and interior lights. The industry believes that in the next 10 years, white light-emitting diodes will be widely used in lighting, becoming the dawn of human lighting in the 21st century.
There is a legend in China that there is a car sac in the night, and there is an illuminator in the tail of the firefly. The main substances in the luminescent cells are luciferin and luciferase. Insect fluorescein is the source of light energy, and luciferase is the catalyst. The efficiency of luciferin conversion energy is very high. Only about 2%-10% of the energy is wasted on the heat energy, and the rest of the energy is used to emit light. Therefore, the firefly's luminescence can be called a "cold light", physicist. Think this is a very ideal light.
Until October 21, 1879, in a dusty laboratory in New Jersey, USA, Edison sealed a very thin carbon fiber in a glass bubble and used a vacuum pump to pump the air out of the glass bubble. The voltage is supplied steadily, turning the filament into a very stable bright light source, and the era of electric lighting has come. Although incandescent bulbs have been modified to suit specific needs, they can be subdivided into general-purpose lamps, high-voltage and low-voltage lamps, halogen lamps, and infrared lamps. But in general, incandescent bulbs can not meet the needs of human beings as large rooms or large-scale space lighting equipment, but the invention of electric lights has occupied a very important position in the history of human science for more than a hundred years.
Fluorescent lamps can be said to be a very important invention for indoor lighting. Most of the nighttime indoor lighting in the world is now fluorescent. Compared with the traditional light bulb, the fluorescent tube has the advantages of long service life, high luminous efficiency, large illumination area, and can be adjusted into different light colors. The use of fluorescent lamps meets the needs of most human occasions. Although various types of electric lamps are still under development, as of the 20th century, it is still impossible to develop inventions that are more in line with human needs than fluorescent lamps. Although fluorescent lamps have many advantages, the biggest disadvantage is that fluorescent tubes consume a lot of power, and most of the electrical energy is consumed in thermal energy. In addition, the mercury in the lamp has the problem of polluting the environment. Therefore, it is always the task of scientists and the business community to seek new illumination sources.
Light-emitting diodes that began to develop in the late 20th century will bring dawn to the future. In 1996, based on GaN blue light-emitting diodes, Nichia Corporation of Japan developed a yellow LED to excite yttrium aluminum garnet phosphors to produce yellow fluorescence. The resulting yellow fluorescence is then mixed with blue light to produce white light (blue LED with YAG). Phosphor) has opened the curtain for LEDs entering the lighting market.
The main structure of a white light-emitting diode consists of a diode at the bottom, a phosphor coated on a diode or a lampshade, and a lampshade that isolates the outside. When the bottom diode (usually a semiconductor material) is excited by electrical energy, an electron-to-hole pair is generated. When the electron is recombined with the hole, the diode emits a first emitted light (ultraviolet light or blue light). The first emitted light can be absorbed by the phosphor and converted into a second emitted light (visible wavelength range), and when the first emitted light that is not absorbed by the phosphor and the second emitted light emitted by the phosphor are mixed, White light.
With the use of different phosphors, LEDs can also have different colors of light or warm colors like fluorescent tubes. In addition, after years of research and development, it has been found that the use of high-efficiency ultraviolet light-emitting diodes as the light source is the future choice for white light-emitting diodes to become lighting devices. Therefore, how to develop high-efficiency ultraviolet light-emitting diodes and phosphors suitable for ultraviolet light is the goal of everyone today.
With the advancement of LED technology, the application of white LEDs has gradually developed, including indicator lights, portable flashlights, LCD screen backlights, automotive instrumentation and interior lights. The industry believes that in the next 10 years, white light-emitting diodes will be widely used in lighting, becoming the dawn of human lighting in the 21st century.
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