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Scanning tunneling microscope ͑STM͒-excited molecular fluorescence from H 2 TBP porphyrin ͑H 2 TBPP͒ thin films on Au ͑111͒, Ag, highly oriented pyrolytic graphite ͑HOPG͒, and indium tin oxide ͑ITO͒ surfaces has been investigated in air. Molecular fluorescence was observed from the H 2 TBPP films on Au and Ag, but it was extremely weak or undetectable from films on HOPG and ITO. The maximum intensity of molecular fluorescence from H 2 TBPP/ Ag is at least 100 times stronger than that from H 2 TBPP/ HOPG. Strong enhancement of molecular excitation by substrate surface plasmons is suggested for the STM-excited molecular fluorescence from H 2 TBPP only on the noble metal substrates.

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