multi-chip white LED in the control circuit

Phosphor

At present three types of white LED achieved mainly through: 1) using red, green and blue LED combination light that the multi-chip white LED; 2) with blue LED chip and yellow phosphor, the color of the blue and yellow Complementary be white, or blue LED chips with red and green phosphors, issued by the chip, blue, red and green phosphor issued three-color mixing was white; 3) the use of UV LED chips issued by near-UV trichromatic phosphors excited by white light. After two ways need to be used white LED phosphor, called phosphor converted LED (phosphor converted Light Emitting Diode, pc-LED), which compared with the multi-chip white LED in the control circuit, production costs, heat, etc. have an advantage in the current LED products dominated the market.

Fluorescent semiconductor lighting technology has become a key material in one of its features directly determine the phosphor converted LED brightness, color rendering index, color temperature and luminance efficiency performance. There are currently yellow phosphor cerium activated yttrium aluminum garnet (Y3Al5O12: Ce3 +, YAG: Ce) and europium activated alkaline earth metal silicate; red phosphors are mainly: Ca1-xSrxS: Eu2 +, YVO4: Bi3 +, Eu3 + and M2Si5N8 : Eu2 + (M = Ca, Sr, Ba), etc.; green phosphor mainly: SrGa2S4: Eu2 +, M2SiO4: Eu2 + (M = Ca, Sr, Ba), and MSi2N2O2: Eu2 + (M = Ca, Sr, Ba), etc.; blue phosphor mainly: BaMg2Al16O27: Eu2 +, Sr5 (PO4) Cl: Eu2 +, Ba5SiO4Cl6: Eu2 + and LiSrPO4: Eu2 + and so on.