Phosphor-free white light-emitting diodes*
Guo Xia†, Liu Qiao-Li, Li Chong, Liu Bai, Dong Jian, Shen Guang-Di
       
Dependence of LER and CRI of (a) tri-chromatic and (b) tetra-chromatic white LEDs on the different wavelength combinations of individual LEDs when the CCT is maintained at (5500±20) K.