TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The inorganic converter material is provided in nanoparticle form with an average diameter of 100 nm or less. The inorganic material is provided in particle form embedded in a matrix material, where the difference in refractive indices between inorganic material and matrix is 0.05 or less. The inorganic converter material is europium-manganese-activated barium-magnesium-aluminum oxide (BaMgAl10O17:Eu,Mn), manganese-activated barium-aluminum oxide (BaAl12O19:Mn), manganese-activated zinc silicate, europium-activated strontium-silicon-nitrogen oxide (SrSiO2N2O2:Eu), cerium-terbium-activated lanthanum phosphate, terbium-activated yttrium-gadolinium silicate ((Y1-xGdx)2SiO5:Tb), cerium-terbium-activated gadolinium-magnesium borate (GdMgB5O10:Ce,Tb), terbium-activated cerium-magnesium aluminate (CeMgAl11O19:Tb), terbium-activated yttrium-gadolinium borate ((Y1-xGdx)BO3:Tb), terbium-activated indium-gadolinium borate ((In1-xGdx)BO3:Tb), terbium-activated yttrium-gadolinium-aluminum-gallium oxide ((Y1-xGdx)3(Al1-yGay)5O12:Tb), europium-activated barium-strontium silicate ((Ba1-xSrx)2SiO4:Eu), cerium-activated yttrium-gadolinium-aluminum-gallium oxide ((Y1-xGdx)3(Al1-yGay)5O12:Ce), europium-activated calcium-silicon-nitrogen oxide (CaSi2N2O2:Eu), europium-activated strontium-calcium silicate ((Sr1-xCax)SiO4:Eu), europium-activated strontium-lithium silicate (SrLi2SiO4:Eu), europium-activated indium-gadolinium borate ((In1-xGdx)BO3:Eu), europium-activated yttrium-gadolinium oxide ((Y1-xGdx)2O3:Eu), europium-activated yttrium-gadolinium-vanadium-phosphorus-boron oxide ((Y1-xGdx)(V,P,B)O4:Eu), europium-activated yttrium-gadolinium niobate ((Y1-xGdx)NbO4:Eu), europium-activated barium-gadolinium silicate (Ba2Gd2Si4O13:Eu), europium-activated barium-gadolinium-germanium oxide (Ba2Gd2Ge4O13:Eu), europium-activated yttrium-gadolinium niobate ((Y1-xGdx)NbO4:Eu), europium-activated yttrium-gadolinium tantalate ((Y1-xGdx)TaO4:Eu), europium-activated yttrium-gadolinium oxyfluoride ((Y1-xGdx)OF:Eu), europium-activated lanthanum-gadolinium oxychloride ((La1-xGdx)OCl:Eu), europium-activated yttrium-gadolinium oxychloride ((Y1-xGdx)OCl:Eu), europium-activated scandium-lutetium silicate ((Sc1-xLux)2Si2O7:Eu), europium-activated strontium-barium-calcium sulfide ((Sr1-x-yBaxCay)S:Eu), europium-activated strontium-barium-calcium silicon nitride ((Sr1-x-yBaxCay)2Si5N8:Eu), europium-activated calcium-strontium-aluminum silicon nitride ((Ca1-xSrx)AlSiN3:Eu), manganese-activated magnesium-germanium oxyfluoride (Mg4GeO5.5F:Mn), cerium-activated yttrium-lutetium-aluminum-gallium oxide ((Y1-xLux)3(Al1-yGay)5O12:Ce), cerium, and/or ytterbium-activated yttrium-gadolinium oxide ((Y1-xGdx)2O3:Yb).    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The inorganic converter material is embedded in polymer layer made of very stable material, such as PTFE, polyvinyl fluoride, polyvinylidene fluoride, perfluoropolyether, and/or fluorinated ethylene-propylene.