Figure 4
From: Enhancing LED spectral output with perylene dye-based remote phosphor

(a) Solid-state blue LED, converted to (b) green F-LED and (c) red F-LED using FCCs (with fixed camera setting), with inset showing the bottle cap structure of the FCC. Comparison of the spectral responses of solid-state blue LEDs with (d) green and (e) red F-LEDs with varying FCC dye concentrations.