An organic light emitting device includes an anode, the anode including a conductive polymer, a fluorine-containing organic material, and metal nanoparticles, a cathode facing the anode, and an emission layer between the anode and the cathode. One embodiment of the present invention includes a method for preparation of a target containing intermetallic composition of antimony Ti\u2014Sb, Al\u2014Sb, Cu\u2014Sb, or Ni\u2014Sb in order to produce radionuclides with a beam of accelerated particles. the vertical reciprocating member carrying the massaging member thereon. The wall structure is made of a flexible material. The electrophotography rubber member or sheet-separation rubber member is formed of a rubber elastomer containing a polyurethane formed from a long-chain polyol containing a polyester-polyol having a number average molecular weight of 500-5,000 and an ester concentration of 2-8 mmolg, wherein the ester concentration is defined by the following relationship: Ester concentration. The swimmer includes one or more fins which interact with the water as the swimmer moves up and down, and generate forces which propel the vehicle forward.