Polymethacrylate having a pendent 8-hydroxy-quinoline moiety was prepared using Kelex-100 (7-(4-ethyl-1-methyloctyl)-8-hydroxyquinoline) as a starting material. A soluble polymer having tris(8-hydroxyquinolinato)aluminum (AlQ(3))-type side chains was obtained through the complexation of the polymer with Me3Al in the presence of a monomeric Kelex-100. The polymer complex was applied to an organic light-emitting diode (OLED) device through a spin-cast process.