Figure 2From: Optical efficiency characterization of LED phosphors using a double integrating sphere system Emission spectra of phosphors at 450 nm excitation wavelength. Graph a illustrates the emission spectra of a green silicate, yellow garnet and red nitride phosphors measured in the sphere T of the DIS system with blue LED excitation. Graph b shows the emission spectra of the green phosphor when it is illuminated either by a LED source or a monochromatic laser source.Back to article page