Since the late 1960s, LED was born in brightness every 10 years increased by 30 -fold , 10 -fold lower prices , " Hydes Law" -like pace. According to reports , the current white LED luminous efficiency of laboratory data over 100lm / W, and into the field of high-power white LED business has reached 40lm / W. With breakthroughs in key technologies , the future of high-power LED light effect still has much room for growth , the highest possible reach 150 ~ 200lm / W.
With the advent of high-power LED breakthrough and packaging , cooling and other key technologies, commercialization process 5WLED has begun to take shape , which makes flux LED module has been greatly improved. Nichia 's latest research data from the show that power was 5.5W and 11W, respectively 250lm and 400lm luminous flux of high-power LED integrated module has been developed. This makes the process of LED for general lighting and a big step forward .
LED light color temperature and color rendering white LED is closely related to the preparation of solutions . 1996 Nichia InGaN blue chip companies Firstly plus YAG ( yttrium aluminum garnet ) $ phosphor method made ??white LED. Since then , people using R, G, B three -color light and near ultraviolet chip excitation mixing R, G, B three -color mixed light into the phosphor white LED.
YAG phosphor blue LED plus the way because the process is relatively simple, low cost technology is currently the most common way of white LED was prepared , but its relatively low CRI . Adding a red phosphor and the green phosphor can be improved , although the color rendering index , but the relatively low conversion rate of the red phosphor , total luminous flux typically causes attenuation , i.e., light efficiency is lowered. Using near- ultraviolet LED RGB phosphor plus theoretically can get any color temperature and high CRI white LED, but for UV LED phosphor technology is not yet mature . Single- chip phosphor coating method according to the type of phosphor coating techniques , usually have a color temperature difference of 80 ~ 800K . Theoretically you can get any color temperature LED multi-chip and high color rendering white LED, but the multi-chip LED forward voltage and light output is different, in addition they maintain the temperature characteristics and properties of light is not the same , and thus the circuit design requirements high , the current technology is not mature , large differences between the module color temperature .
