Blue light not only glows blue, but is an integral part of the color spectrum. Without blue, there is no white.
Blue-emitting LED chips based on indium gallium nitride (InGaN) are combined with a yellowish luminescent layer (converter) located in front of the LED chip, which acts as a wavelength converter, resulting in a white-emitting LED.
Another method to achieve white light is to mix red, green and blue as additive color mixing. Since red and green LED chips were available first, they alone could not be used to produce white LED light. With the development of blue, the third basic color is available. Now the three colors can be overlapped to white light, the RGB mixed white.
Thus, 2 fundamentally different methods are available to generate white light: blue with converter and RGB mixing, which are more suitable depending on the application.
General application fields of blue LED chips are general lighting, projection, high current operation, architectural lighting, outdoor lighting, sensing and many more...