Real-Space Investigation of Intermolecular Energy Transfer by Scanning Tunneling Luminescence Spectroscopy

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  • 走査トンネル顕微鏡発光分光法による分子間エネルギー移動の実空間計測
  • ソウサ トンネル ケンビキョウ ハッコウ ブンコウホウ ニ ヨル ブンシ カン エネルギー イドウ ノ ジツ クウカン ケイソク

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Abstract

<p>Energy transfer is an essential process in photosynthesis and various energy-harvesting devices. So far, nanoscale features of energy transfers are unknown because of the limited spatial resolution of conventional methods. We conducted a molecular-level investigation of energy transfers in molecular dimers consisting of a free-base phthalocyanine and magnesium phthalocyanine (H2Pc and MgPc) by scanning tunneling luminescence spectroscopy. Local excitation of an MgPc with the tunneling current of a scanning tunneling microscope give rise to luminescence from a nearby H2Pc as a result of energy transfer. We demonstrate the possibility of a single-molecule valve device for energy transfer, which is revealed by a blinking behavior of energy transfer. Moreover, a back-and-forth energy transfer was observed, where the energy was transferred from the second singlet state (so-called Qy state) of H2Pc to the first singlet state (Q state) of MgPc and finally to the first singlet state (Qx state) of H2Pc.</p>

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 38 (9), 455-459, 2017

    The Surface Science Society of Japan

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