A self-decoupled porphyrin with a tripodal anchor has been synthesized and deposited on Au (111) using different wet-chemistry methods. Nanoscale electroluminescence from single porphyrin molecules or aggregates on Au (111) has been realized by tunneling electron excitation. The molecular origin of the luminescence is established by the vibrationally resolved fluorescence spectra observed. The rigid tripodal anchor not only acts as a ...