LED is a kind of special diode, should join most report when can give out light, be used in electronic appliance to show the indicator light that whether is circuit shut or opens normally, oxygen of transparent annulus of LED of chip of annulus oxygen semiconductor surrounds those two lines that seal next extending or " bulb " shows LED to answer how to increase connection to circuit, the negative pole of LED lead is will show with two kinds of methods:

One kind is by the planar; of bulb

The 2nd kind is two lines in the center that short line, negative pole lead should join batteries loses end, LED moving voltage is opposite very low about only 1 arrive voltage of 4 bend over, imbibition electric current also has 10 to arrive only about 40 milliampere. The one part with glow the most important diode is in namely chip of bulb center semiconductor, chip has two area that depart by interface, p area is control by positive electrical charge, and N area is control by negative electric charge, this interface acted as P and the fender that N electron flows, when the voltage when semiconductor chip is only enough, the flow when electric current just leaves and electron cross interface to enter P area.









Makes light and what LED gave out to decide to give off light the color of 2

Arrive at chip to cross the wire of glow diode when enough voltage, the in P and N area with very easy electron crosses space to be in, want than negative electric charge in P area positive electrical charge a lot of more, the electron in N area is more than positive electrical charge, begin flow when voltage and electric current, there is shift of enough the sources of energy to cross disjunctive place to enter P area in the electron of N area, because attracting P area electron between negative electric charge of mutual coulomb force to attract positive electrical charge instantly each other, when the electron enough shift arrives the immediateness of the positive electrical charge with P area, these two kinds of charge are united in wedlock afresh with respect to " "

Every time when electron and positive electrical charge are united in wedlock, change of electric potential energy is electromagnetism can, every time when the new union of negative electric charge, electromagnetism can quanta is given out with the photoelectricity form of the frequency character of semiconductor material (it is gallium normally, the chemical element of arsenic and phosphor is united in wedlock) it is when photons only inside the frequency limits of special narrow the energy that the diode of semiconductor material shine that just can launch light to differ gives out different color and need to differ goes making their brighten.
Previous12 Next

Previous:Led shows technology and application
Next:no article