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True interpretation of LED

  日期:2011-11-18  浏览次数:85

The LED structure is very simple: in general, is a square diode chip mounted in a plastic, resin or ceramic base layer of a special epoxy. At the center of the electronic semiconductor sensor materials by conversion to generate light, and letters posted on the "hood-like" micro-chip epoxy layer, the light can be "mapped out". A typical LED has two pins, a long one short. Longer pin is the anode or cathode can also be said, a little short pin is the cathode. Different size and shape of the LED base, and the LED chip size, chip and the epoxy lens and the distance between the reflector shape and other factors, will decide in the light of the observation angle. Diode chip production of chemical elements with each other, with the energy factor, can be extended to generate photons, determined wavelength, thereby determining the color of light. Close to the infrared LED lights from the initial to the recent UV, is now can produce full spectrum light. In general, when using a single chip, LED light is monochromatic. When two or more different colors of chips into the same epoxy layer, can produce multi-color LED. Turning to the multi-chip technology, three-chip multi-chip technology also can produce white light: When the red, green and blue color through the three original mix the right proportion, it can produce white light. Encapsulated in epoxy with a layer of red, green and blue-chip can be individually controlled, so you can produce different color mixing and other solid color. Today, the RGB LED in the entertainment industry and more widely, because it can produce mixed colors and other lighting effects.
Piranha LED
Four pin design Piranha LED pins relative to the traditional two light-emitting diodes, it has a very big advantage: either vibration or impact will not damage the LED, it will not make it and disconnect the electrical plug. Two pins in the design of a high degree of tremor LED application products, very easy to disconnect.
Another advantage of LED Piranha is its low thermal resistance. Because of its large lead frame design, most piranha type LED perforation have been identified with the lowest thermal resistance, which make it a high-performance applications, has a bright future.
LED life
LED in the general description, are using more than 50,000 hours, and some manufacturers claim that their LED can operate 100,000 hours. The main problem is this, LED is not a simple operation is no longer just, it's rated lamp life can not be measured using traditional methods to calculate. In fact, when the test LED life, no one has been waiting for it to stay next to the stop operation. However, there are other ways to measure the LED life. The reason why LED lasting, because it does not produce filament fuse problem. LED does not directly stop the operation, but it gradually over time degraded. It is predicted that high-quality LED after 50,000 hours of continuous operation, but also to maintain the initial light intensity of 60%. Assumes LED has reached its rated life, in fact, it may still glow, but the light is very weak nothing. To extend the service life of LED, it is necessary to reduce or completely disperse the heat generated by LED chip. LED to stop operation of the heat is the main reason.
It is estimated that, LED itself can be used thousands of hours, but this does not guarantee that you can use LED products for so long. Operation and error process can be easily "destroy" LED. For example, the supply current is higher than the scale of approved manufacturers, LED light will produce more light, but constant heat will shorten LED life. LED experts to be the true characteristics of the light-emitting diodes, solid-state lighting expertise and engineering skills have a full understanding, and also need to have enough creativity.

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