LED Lighting Blog

For general lighting purposes, people need more white light source. In 1998 the white light LED lighting development success. This {! – Advertising – } LED is an GaN chip and yttrium aluminum garnet ( YAG ) package together. GaN chip emits blue light ( x P = 465nm, Wd =30nm ), led ribbon lighting, high temperature sintering material containing Ce3 + YAG fluorescent powder by the blue light to stimulate issued a yellow light emitter, peak 550nm. Blue LED substrate is mounted in a bowl-shaped reflection cavity, covered with mixed with YAG resin layer, about 200-500nm.   LED substrate by the blue part of absorbed by fluorescent powders, another part of the blue light and yellow light emitted by the fluorescent powder mixed, led ribbon lighting, can be a white. Now, for the InGaN / YAG white LED lighting, YAG phosphor by changing the chemical composition and regulation of fluorescent powder layer thickness, can obtain the temperature3500-10000K colored white. At present already commercialized the first product to blue chip plus YAG yellow fluorescent powder, its best luminous efficiency of about 25lumens / watt, led ribbon lighting, YAG for many Japanese Nichia Corporation import, the price of 2000 yuan / kg; second are Japan’s Sumitomo Electric also developed with ZnSe materials for white light LED however, led ribbon lighting, the poor light efficiency.   from the table can also be seen in certain types of white LED light source is inseparable from the four fluorescent powder: three primary colors of rare earth red, green, blue or yellow powder garnet structure, in the future more promising is the three wavelength, i.e. to Inorganic UV wafer with R.G.B three color fluorescent powder, led ribbon lighting, used for packaging LED lighting white, is expected to three wavelength white light LED this year, commercial opportunities. But here the three fluorescent powder particle size requirements are relatively small, led high bay,  the stability is high, specific application still are in exploration. The use of LED light source for illumination, first replaced power-hungry incandescent lamp, and then gradually to the whole lighting market, will save a lot of power. Recently, led ribbon lighting, white LED has reached the single electricity more than 1 watts, the light output of 25lumens, also increased its practicality.