| abstract |
The invention provides a lighting unit comprising a source of blue light, a source of green light, a first source of red light comprising a first red luminescent material, configured to provide red light with a broad band spectral light distribution, and a second source of red light comprising a second red luminescent material, configured to provide red light with a spectral light distribution comprising one or more red emission lines. Especially, the first red luminescent material comprises (Mg,Ca,Sr)AlSiN 3 :Eu and/or (Ba,Sr,Ca) 2 Si 5-x Al x O x N 8-x :Eu, and the second red luminescent material comprises K 2 SiF 6 :Mn. |