polymeric organic coating for electroluminescent lamp components , particularly for phosphor particles and electrodes and a method of making same , wherein the polymer is formed using an initiator , preferably by ring - opening metathesis polymerization . a dense hydrophobic organic coating is formed which is capable of protecting the electroluminescent device components from exogenous agents such as moisture and eventual degradation . the polymer layer may be attached to an outer surface of the component by one or more tethering layers .