In the PN junction of some semiconductor materials, the superfluous energy will be released in the form of light when the injected minority carriers are combined with the majority carriers, thus directly converting electric energy into light energy. PN junction plus reverse voltage, a few carriers are difficult to inject, so it does not emit light. This kind of diode using injection electroluminescence principle is called light-emitting diode, commonly known as LED. When it is in the positive working state (that is, the two ends of the positive voltage), the current from the LED anode to the cathode, the semiconductor crystal will emit different colors of light from ultraviolet to infrared, the strength of the light is related to the current. At first, LED was used as an indicator light source for instruments and meters.
LED energy-saving lamp advantages and national policy support, make China’s LED energy-saving lamp contains a huge potential market. China’s LED energy-saving lamp industry needs to establish national standards as soon as possible to regulate the market; At the same time, we will carry out scientific research to improve the core competitiveness of the products and enrich the product series of LED energy-saving lamps applied in the household field.
At present, although LED has been the mainstream lighting products in the market, the price is still high and low, uneven. However, the production process of big brands is more strict, and the after-sales service is more guaranteed, so you can get better quality and service. In addition, many people think that LED lighting has the harm of blue light, in fact, the light source has blue light is a normal phenomenon, as long as in the safe range, we as long as the time to buy a good quality brand, will get the right lighting and color.
Rayman Optoelectronics related LED display products are also used in commercial projects around the stadium. It is worth mentioning that Tailong Wisdom has become the supplier of 130 LED pole screens around the main venue of the Qatar World Cup. As a part of 5G smart pole screens, these LED pole screens are not only HD and high-light, but also equipped with intelligent functions such as automatic brightness adjustment, remote one-button power off, multi-screen synchronous playback, temperature control intelligent heat dissipation, intelligent IP broadcasting and so on.
Comprehensive analysis shows that the foreign bodies are electrochemical migration of the solder under the action of sticky or corrosive components and electric field at the same time, resulting in short circuit between the LED electrodes. The above summarized the common reliability problems of LED from the aspects of chip design, LED packaging (conductive adhesive, bonding, structure), LED use (overcurrent, ESD, welding), and put forward targeted improvement measures. It is hoped that the industry can provide a reference for solving LED faults, so as to provide the yield and reliability of LED devices.
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