Analysis of the basic structure and application ad

  • Detail

Analysis of the basic structure and application advantages of LED

the structure of LED is actually very simple: Generally speaking, a square diode chip is installed in a special epoxy layer of plastic, resin or ceramic base. The electrons in the center of the semiconductor can be converted into light through sensing raw materials, and the microchip sealed in the "cover" epoxy layer can "map" the light. A typical LED has two pins, one long and the other short. The longer pin is the anode, or positive pole, and the shorter pin is the cathode

address quoted in this paper:

the LED base with different sizes and shapes, the size of LED chip, the tightening test method of rigid foam GB 8813 (8) (iso844 (1) 978) the distance between chip and epoxy lens, and the shape of reflector jointly determine the observation angle of light. The chemical elements that produce diode chips combine with each other and cooperate with energy factors to extend the generation of photons, determine the wavelength, and then determine the color of light. From the initial near infrared light to the recent ultraviolet light, LED can now produce a full spectrum of light

generally speaking, when a single chip is used, the light of LED is monochromatic. When two or more chips with different colors are installed in the same epoxy layer, multicolor LED can be produced. When it comes to multichip technology, the multichip technology of three-layer chip can also produce white light: when the three original colors of red light, green light and blue light are mixed in the correct proportion, white light can be produced

the red light, green light and blue light chips encapsulated in the same epoxy layer can be individually controlled, which can also produce different mixed colors and other solid colors. Nowadays, tricolor LED is more and more widely used in the entertainment industry, because it can produce mixed colors and other lighting effects

piranha led

the piranha led designed with four pins has great advantages over the traditional LED with two pins: whether it is vibration or collision, it will not damage the LED, nor will it be disconnected from the electrical plug. The two pin LED is very easy to disconnect when it is used in highly vibrating products

Another advantage of piranha LED is its low thermal resistance. Because of its large lead frame design, most piranha perforated LEDs are considered to have the lowest thermal resistance, which also makes it have a bright future in high-performance applications

led service life

led can be used for more than 50000 hours in general instructions, and some manufacturers claim that their LED can operate for about 100000 hours. The main problem in this regard is that led is not simply no longer in operation, and its rated service life cannot be calculated by traditional lamp measurement methods. In fact, when testing the service life of LED, no one will always wait for it to stop working. However, there are other ways to measure the service life of LEDs. The reason why LED is durable is that it will not cause the problem of filament fusing. LED will not stop working directly, but it will gradually deteriorate with the passage of time. It is predicted that high-quality LEDs can maintain more than 60% of the initial brightness after 50000 hours of continuous operation. Assuming that the LED has reached its rated service life, it may still glow when long carbon fibers are added to the mixture, but the light is very weak. In order to prolong the service life of LED, it is necessary to reduce or completely dissipate the heat energy generated by LED chip. Thermal energy is the main reason why led stops working

it is estimated that the LED itself can be used for thousands of hours, but this does not guarantee the synchronous accuracy of the transmission, and it cannot guarantee that the LED products can be used for so long. Wrong operation and process can easily "destroy" led. For example, if the current supplied is higher than the standard approved by the manufacturer, the light produced by the LED will be brighter, but the continuous heat energy will also shorten the service life of the LED. A real led expert must have a full understanding of the characteristics of light-emitting diodes, solid-state lighting expertise and engineering skills, and also have enough creativity to provide warehousing services for upstream suppliers

Copyright © 2011 JIN SHI