WLEDs Mie-scattering theory Color rendering index Luminous flux Color quality scale Dual-layer phosphor Lumen output Luminous efficacy MgSr3Si2O8:Eu2+ Mn2+ luminous efficacy Dual-layer remote phosphor geometry SrBaSiO4:Eu2+ Triple-layer phosphor color rendering index dual-layer phosphor (Ce CaCO3 CaF2 CaGa 2 S 4 :Mn 2+ Color uniformity Dual-layer remote LaAsO4:Eu3+ LiLaO2:Eu3+ Mg4(F)(Ge MgCeAl11O19:Tb3+ Mie-scattering Mie-scattering theory color rendering index Na(Mg2–xMnX)LiSi4O10F2:Mn Na3Ce(PO4)2:Tb3+ Phosphor geometry Remote phosphor Remote phosphor structure Reomote-phosphor SiO2 Sn)O6:Mn2+ Tb)MgAl11O19:Ce:Tb Tb3+ TiO2 Y2O3:Ho3+ YF3:Er3+ YPO4:Ce3+ Yb3+ color quality color uniformity lambert-beer law luminous flux mie-scattering theory remote-phosphor remote phosphor package triple-layer phosphor