The STM-induced luminescence of a conjugated polymer poly[2-methoxy-5-(2'-ethyl-hexyloxy)-p-phenylene vinylene] (MEHPPV) on metallic substrates of Ag(111), Ag, Au and Cu and ITO have been investigated in air at room temperature by using Ag or Pt-Ir tip. Molecular fluorescence of MEHPPV was observed from the polymer film on Ag(l 11), Ag and Au substrates, and all of them show an intensity enhancement compared to the pure substrates. A mutual enhancement between surface plasmon and molecular fluorescence is suggested for the STM-induced luminescence of MEHPPV on these substrates. (c) 2006 Elsevier B.V. All rights reserved.