Purification process for organic electronics material

A method of making an electroluminescent device, comprising:

• a purification step of treating, with a material modified by a phosphorus atom-containing compound, an organic electronics material that contains Pd as an impurity so as to remove Pd;
• and
• a step of making a middle layer of an electroluminescent device using the organic electronics material which is purified at the purification step,
• wherein the phosphorous atom-containing compound is any one of a phosphine (R3P), a phosphate ((RO)3PO),a phosphite ((RO)3P) and derivatives thereof, where R independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, an aryl group, or an aralkyl group;
• wherein the material is any one of silica gel, alumina, zirconia, titania, crosslinked polystyrene, polymethacrylate and styrene-divinylbenzene copolymer.