Which Means To Achieve White Light LED

White color is mixing by red, green and blue, when the green light brightness of 69%, 21% brightness of red, blue brightness of 10%, after the blending, people will feel is pure white, but can’t achieve all chromatographic results due to led RGB three-color chromaticity coordinates process.

There are three main methods to achieve white light LED at current.

1.       Through the LED red, blue, yellow three-color combination of multi-chip emitting synthetic white light.

Advantages: high efficiency, color temperature control, better color rendering.

Disadvantages: three primary colors lumen decay is different for each other, will caused instability color temperature, the control circuit is more complex and costly.

2.       Blue LED chip drive phosphors, then emitting white light by Blue LED and phosphor. To change the color performance in which you can add a little red phosphor or both plus the amount of green and red phosphors.

Advantages: high efficiency, simple preparation, temperature stability, good color rendering.

Disadvantages: poor consistency, color temperature, the angle changes.

3.       Near-ultraviolet LED chip drive phosphors emitting tricolor synthesis white light.

Pros: good color index, simple preparation.

Disadvantages: Currently low efficiency LED chips have UV leak problem phosphor temperature stability issues need to be resolved.

4.       Other Methods

There are several other white LED encapsulation method for special occasions.

4.1       The first: the red, blue, green, three-chip package together, according to a certain percentage of its light color control, mixed with a white light.

4.2       The second method is to mixed red, blue, green, yellow four chips to emitting white light.