An electroluminescent device has a doped lithium quinolate as the compound forming the electroluminescent material. More particularly, there is provided a desiccant wheel upstream of the air compressor to dry air prior to its compression. The first and second channels respectively have first and second exposing portions arranged in two rows. In some embodiments, the feedstock delivery system further includes a flow restrictor associated with the recycle conduit and a pressure-actuated valve that selectively permits the recycled feedstock to bypass the flow restrictor.