Author/Authors :
Uemura، نويسنده , , T. and Furumoto، نويسنده , , M. and Nakano، نويسنده , , T. and Akai-Kasaya، نويسنده , , M. and Saito، نويسنده , , A. and Aono، نويسنده , , M. and Kuwahara، نويسنده , , Y.، نويسنده ,
Abstract :
Fluorescence from copper phthalocyanine thin films was first observed using tunneling electrons from a scanning tunneling microscope on the Au substrate. The plasmon enhancement effect enables the detection of the fluorescence emission even though the intrinsic fluorescence from a copper phthalocyanine molecule is extremely weak. Moreover, this emission appeared under an energy-forbidden condition, where the fluorescence at the energy of ∼1.7 eV could be observed with bias voltages lower than 1.7 V. As the threshold bias voltage of this emission is ∼1.1 eV, this emission can be explained by the up-conversion transfer resulting from the plasmon-enhanced triplet–triplet annihilation of molecules.
