At present, there are three main methods for LEDs to achieve white light:
1. Synthesize white light through LED tri-color multi-chipset with red, green and blue.
Advantages: high efficiency, controllable color temperature and good color rendering.
Disadvantages: Different color attenuation of the three primary colors leads to unstable color temperature, complicated control circuit and high cost.
2. The blue LED chip excites the yellow phosphor, and the yellow light of the LED blue light and the phosphor is combined to synthesize white light. In order to improve the color rendering performance, a small amount of red phosphor or a suitable amount of green and red phosphor may be added thereto.
Advantages: high efficiency, simple preparation, good temperature stability and good color rendering.
Disadvantages: poor consistency, color temperature changes with angle.
3. The ultraviolet light LED chip excites the phosphor to emit three primary colors to synthesize white light.
Advantages: good color rendering and simple preparation.
Disadvantages: At present, the efficiency of LED chips is low, there is a problem of ultraviolet light leakage, and the problem of temperature stability of phosphors needs to be solved.
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