Principle of LED lights
, light emitting diode, is a kind of ability to electric energy into visible light solid state semiconductor devices, it can be directly put DianZhuan into light.
The heart of the LED is a semiconductor chip, chip attached on a bracket, at the end of the end is negative, the other end connected to the power of the anode, the whole chip is encapsulated by epoxy resin.
< / p > < p > semiconductor chip consists of two parts, one part is p-type semiconductors, dominated by holes in it, the other end is n-type semiconductor, in this way is mainly electronic.
But this two kinds of semiconductor connected, forming a P - between them
When a current flows through a wire to the chip, the electron will be pushed P area, electron and holes in the P zone compound, then will be issued in the form of photon energy, this is the principle of LED light.
And the wavelength of light was the color of the light, is the formation of P -
N junction of the material.
< / p > < p > the first LED is used as the indicator light instrument and then all kinds of light color of LED traffic light and display screen has been widely applied in large area, produced good economic and social benefits.
12 inches of red traffic lights, for example, in the United States could have been used long life, low luminous efficiency of the 140 - watt incandescent lamp as light source, it produces 2000 lumens of white light.
After the red filter, light loss 90%, only 200 lumens of red light.
And in the light of the new design, using the 18 red LED light source, including circuit loss, total power consumption of 14 watts, can produce the same light.
Car light is also an important field of LED light source.
< / p > < p > for general lighting, people need more white light sources.
Hair white light LED successful development in 1998.
This LED to GaN chip and yttrium aluminum garnet (
GaN chip blu-ray (
λp = 465海里,Wd = 30海里)
, high temperature sintering of Ce3 + YAG phosphors were excited by blue light yellow light, peak 550 m nled lamp.
Blue LED substrate is installed in the bowl reflection cavity, covered with thin layer of resin mixed with YAG, about 200 -
LED substrate from the blue part is absorbed phosphor to another part of the mix blue with yellow light from fluorescent powder, can get the white light.
< / p > < p > for InGaN/YAG white leds, by changing the chemical composition of YAG phosphors and adjust the thickness of phosphor layer, the 3500 - color temperature can be obtained
A variety of white light 10000 k.
This by the method of blue leds for white light, simple structure, low cost, high technical maturity, so use the most.
< / p > < p > chaozhou li electrical appliance factory specializing in the production of light a night light, temperature and humidity meter, LED rechargeable small desk lamp.
< / p > < p > < / p > article source: li 3 c electric light a night light ea -
com/ < p > < / p > < p > < / p >
In the office, various are considered essential since they are used to achieve particular tasks in the office. Among these , led night light, lamp holders and switches, and wall switch with night light are widely used.
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