Come out of the LED panel light, fluorescent body in combination with blue LED, you can easy access to white-light LED, this is one of the industry's most mature white package. Currently white-light LED lighting, home lighting has become a reality. LED controller but more white light attenuation in the course, not suitable for lighting market, for the lighting needs of the high-end market, increase the research and development on white, by altering the development of packaging technology and materials to match the low attenuation of white light products, slightly modest for the LED outdoor lighting industry. Below is our experience in the packaging process is summed up in five points, industry colleagues and you exchange with a view to enhance the building blocks of white light LED package technology.
Impact, chip white LED light failure
From currently experimental of results view, chip light failure of effect is divided into two large class: first is chip of material different led to attenuation different, currently common of Blu-ray chip lined end material for SIC and Sapphire, sic general structure design for single electrode, its thermal conductivity effect comparison good, Sapphire General design for double electrode, heat more difficult export, thermal conductivity effect poor; second is chip of size size, in chip material phase while, size size different attenuation gap also different.
Second, crystalline solid adhesive effect of white light LED strip lights 12v fades
In white light LED package commonly used in the industry of crystalline solid rubber insulated rubber, silicone insulated by epoxy resin and silver plastic. All three have their advantages and disadvantages, selection to be considered. Epoxy resin insulated rubber thermal conductivity sexual difference, but brightness high; silicon resin insulated rubber thermal conductivity effect than epoxy resin slightly good, brightness high, but due to silicon components accounted for must ratio, solid chip Shi next to residues of Silicon resin and fluorescence rubber in of epoxy resin phase combination Shi will produced across layer phenomenon, after hot and cold impact Hou will produced split led to died lamp; silver rubber of thermal conductivity sexual than Qian both are good, can extended LED chip of life, but silver rubber light of absorption comparison large, led to brightness low. For a two-electrode when Blu-ray silver adhesive for wafer in crystalline solid, adhesive weight control is very strict, or prone to short circuit, direct impact on the yield of the product.
Three effects of white light LED light fades, fluorescent powder
There are several ways of achieving white LED light, currently most widely used on Blu-ray chip is one of the most mature through a layer of yellow phosphor, blue and yellow mixed into white light, phosphor material attenuation of white LED light can have a big impact. Most mainstream is YAG YAG phosphor fluorescent powder, fluorescent silicate powder, nitride phosphor, accelerated aging of Phosphors are compared with the blue LED chip white LED light, LED light controllers and the different manufacturers of Phosphor decay is not the same degree of influence, this close relationship with the phosphor raw material components. Lehman photoelectric material for selection of the best white light of fluorescent powder, so that the white light LED compared to peers in attenuation control has been greatly improved.
Four, the impact of fluorescent white light LED light glue failure
Traditional packaged white light LED, fluorescent plastic generally use epoxy or silicone, after failure of experimental results, using silicone blending of white light LED long life than epoxy resin. Causes one is with above two species method package into finished LED, silicone than epoxy resin anti-UV ability strong and silicone thermal effect than epoxy resin good; but in same conditions Xia, with silicone distribution powder of initial brightness to than epoxy resin distribution powder of to low, LED controller most main is due to silicone of refraction rate (1.3-1.4) than epoxy resin (1.5 above) low, so initial light effect than epoxy resin high.
Five, the support effect of white light LED light fades
LED stand mainly copper and iron stand. Thermal conductivity, good conductivity copper prices higher. Relatively poor thermal conductivity and conductive properties of iron supports, more likely to rust, but cheap. LED most of the iron stand on the market. Support of different materials have different impact on the performance of LED, especially on its failure has been particularly prominent. This is mainly due to the better thermal conductivity than copper and iron, the thermal conductivity of copper 398W (m.k) and thermal conductivity of iron 50W (m.k) about one-eighth only to the former, there is support of plating layer thickness is also closely related. In selecting stand, also note that bracket the Bowl size and light-emitting chips as well as die-size matching, which matches the quality of, directly affect the optical effects of white-light LED, otherwise easily lead to asymmetry of beam shape, yellow circle, and Rana nigromaculata, direct impact on the quality of products.
As the application of white LED lighting, customer demand continues to improve, we must innovate, improve the performance of our products to improve our process, as far as possible to meet customer needs. To make high-performance white LED light product, LED controller materials selection and match the best direct impact on white LED light attenuation and quality, therefore, good material and with the best match, coupled with the unique manufacturing process of coordination is the key technology of white lies. We must give full play to its own advantages, continue to intensify research and development, develop products better suited to customer requirements, to contribute to National Semiconductor Lighting industry.