LED-based and LED-plus-phosphor-based approaches for white light sources implemented as di-, tri-, and tetrachromatic sources. The trichromatic approaches can provide a reasonable trade-off between color and luminous source efficiency. Reproduced from . Copyright the American Association for the Advancement of Science, 2005.
Gu et al. Nanoscale Research Letters 2011 6:199 doi:10.1186/1556-276X-6-199