Figure 6

(a) Transmission of a multi-layer thin film that exhibits \(28.9\%\) more light compared to the reference design in forward direction. (b) The hypothetical, effective spectrum of light, which exits the conversion system and irradiates the multi-layer thin film. In both cases, the vertical dashed lines indicate the wavelengths contributing to the LED spectrum and the horizontal lines denote the separation between forward and non-forward direction.