A substrate plasma-processing apparatus for plasma-processing a surface of an electrode of an organic light emitting device. The coated pet chew comprises a substrate coated with unrefined collagen. The present method encompasses the use of reactive simulated moving bed chromatography, wherein above about 95 percent of the fatty acid stock is converted to fatty acid alkyl esters. Side-emitting optical fibers are used to simultaneously stimulate a phosphor pixel located between the two fibers, allowing matrix addressing of each pixel individually.