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1, two primary phosphor conversion white LED light source
Two-primary white LED is made of blue LED chip and YAG phosphor. The general use of blue chip is InGaN chip, blue chip LED with YAG phosphor method has the advantages of simple structure, low cost, relatively simple production process, and YAG phosphor has been applied in fluorescent lamps for many years, the process is relatively mature. However, the efficiency of blue LED is not high enough, so that the efficiency of LED is low; The phosphor itself has energy loss; Phosphors and packaging materials age with time, resulting in color temperature drift and shortening of life.
2, three primary phosphor conversion white LED light source
Effectively improve the color rendering of LED under the premise of high efficiency, this type of white LED has high color rendering, light color and color temperature can be adjusted, the use of high conversion efficiency phosphor can improve the light efficiency of LED. But the phosphor has low efficiency in converting ultraviolet radiation. Powder mixing is difficult; The packaging material is easy to age under ultraviolet irradiation, and its life is short.
3, multi-chip white LED light source
The red, green and blue LED chips are packaged together, and the light they emit is mixed together to get white light. This type of white LED light source is called multi-chip white LED light source. Compared with phosphor conversion white LED, the advantage of this type of LED is to avoid the energy loss of phosphor in the light conversion process, and can obtain higher light efficiency; Moreover, the light intensity of the LED with different light colors can be separately controlled to achieve full color discoloration effect, and better color rendering can be obtained through the selection of the wavelength and intensity of the LED.