Narrow-band Rb1−yKyNa3(Li3SiO4)4:Eu2+(0 ≤ y ≤ 1) cyan-blue phosphors for full-spectrum white LEDs

The introduction of K + into a RbNa 3 (Li 3 SiO 4 ) 4 :Eu 2+ phosphor to partially or completely replace Rb + allows the emission spectrum to be modulated from blue ( λ = 473 nm, FWHM = 22.5 nm) to a narrow cyan band ( λ = 485 nm, FWHM = 21.1 nm).