The invention of the efficient blue Light Emitting Diode (LED) 1 has led to the Solid State Lighting (SSL) revolution that will replace inefficient incandescent and fluorescent lamps by much more efficient light sources. Blue light is necessary for the generation of broadband white light. In a white LED this generation is usually realized through a luminescent or phosphorescent material, which is called the phosphor. 2 Blue light from efficient InGaN quantum wells is absorbed by the phosphor, which emits light of a longer wavelength. White light is generated by mixing the emission of the phosphor with the fraction of non-absorbed blue light. Research on light generation inwhiteLEDshasmainlyfocusedontheimprovementofthequantum efficiency of the phosphor by modifying the material composition and on the change of the emission spectrum in order to optimally match it to the photopic sensitivity curve of the eye. 3