One, LEDstructure and glow principle The people 50 years ago has understood semiconductor material to be able to produce basic knowledge of the light, the first businessman emerges with diode 1960. LED is English Light Emitting Diode (glow diode) abbreviate, its basic structure is the semiconductor material of an electroluminescence, park has the frame of down-lead to go up, next all around with epoxy resin sealed, rise to protect the action of in-house core line, the aseismatic performance of LED is so good. LED structure plan pursues as follows the core share that shows glow diode is the chip that comprises by P semiconductor and N semiconductor, there is to transfer between P semiconductor and N semiconductor layer, call P-n form. In the PN knot of certain semiconductor material, the minority of infuse carries flow child carry with majority stream child compound when can release redundant energy with smooth form, change electric energy directly thereby for light energy. PN knot increases retrorse tension, minority carries stream child hard infuse, reason does not give off light. This kind is used spoon-fed the diode that electroluminescence principle makes calls glow diode, appellative LED. Be in when it to working status when (namely two end are added to voltage) , electric current flows to cathode from LED positive pole when, semiconductor crystal is given out from ultraviolet the light to infra-red and different color, smooth lose by force to be concerned with electric current. 2, LEDThe characteristic of illuminant 1.Voltage: LED uses low-pressure power source, power supply voltage is between 6-24V, differ according to the product and different, so it is a safer than using high-pressured power source power supply, special apply to public. 2. Efficiency: Disappear energy consumption relatively the incandescent lamp of the effect that be the same as light reduces 80% 3. Applicability: Very small, flake of every unit LED is the square of 3-5mm, so can the parts of an apparatus that preparation becomes all sorts of figure, and agree with changeful environment 4. Stability: 100 thousand hours, light declines for initiative 50% 5. Answer time: Of its incandescent lamp answer time to be millisecond class, the noise of LED lamp is in season a class of the second that it is accept 6. To environmental pollution: Without harmful metal mercury 7. Color: Change electric current can become angry, glow diode decorates a method through chemistry conveniently, adjust data can take structure and area unoccupied place, lan Chen of implementation red olivine is polychromatic give off light. If gules LED is when small electric current, as voltaic addition, OK and ordinal turn into orange, yellow, it is green finally 8. The price: The price of LED is higher, than Yu Baichi lamp, the price of a few LED is OK comparative with the price of an incandescent lamp, and normally every groups of signal lamp need by on 300 ～ 500 diode are formed. 3, monochromatic is smooth
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