Knowledge What Is a Violet-pump LED?


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A violet-pump LED is a phosphor-conversion white LED package which uses a violet LED chip (InGaN die) to pump light into a wavelength converting element (down-converter). The wavelength converting element that contains red, green and blue phosphors provides complete conversion of electroluminescence from the violet LED chip. With a spectral power distribution (SPD) uniformly spread throughout the visible spectrum, the resulting white light can achieve superior color rendering. Violet-pump LEDs, however, are less efficient than blue-pump LEDs because the complete wavelength down-conversion leads to a significant amount of Stokes energy loss.