Patent ID: 8343785

Claim:
A method, comprising: attaching a first light-emitting diode (LED) having indium gallium nitride (InGaN) to a support substrate; attaching a second LED having aluminum gallium nitride (AlGaN) to the support substrate; and disposing a luminescent material on the first LED and the second LED, wherein the luminescent material includes a strontium silicon nitride (SrSi 6 N 8 ) doped by one of cerium (Ce 3+ ) and cerium, lithium (Ce 3+ , Li + ) in a manner so that the doped stronium silicon nitride is formulated as one of: Sr 1-x Si 6 N 8 :Ce 3+ x and Sr 1-2x Si 6 N 8 :Ce 3+ x , Li + x , wherein x ranges between about 0.05 and about 0.5.