We investigate the fluorescence from submonolayer rhodamine 6G molecules near gold nanoparticles (NPs) at a well-controlled poly (methyl methacrylate) (PMMA) interval thickness from 1.5 to 21 nm. The plasmonic resonance peaks of gold NPs are tuned from 530 to 580 nm by the PMMA spacer of different thicknesses. Then, due to the plasmonic resonant excitation enhancement, the emission intensity of rhodamine 6G molecules at 562 nm is found to be enhanced and shows a decline as the PMMA spacer thickness increases. The variation of spectral intensity simulated by finite-difference time-domain method is consistent with the experimental results. Moreover, the lifetime results show the combined effects to rhodamine 6G fluorescence, which include the quenching effect, the barrier effect of PMMA as spacer layer and the attenuation effect of PMMA films.
ZIF-8 is regarded as a carrier to capture HPBI and eventually the adsorption of the pore structure would saturate, with altering the luminescent intensity. ZIF-8 may be used to sensitively detect nanoscale molecules via changes in fluorescence.
CoTPP, as a common hypsoporphyrin,
is usually not a luminescent
molecule because of the open-shell Co ion. In this paper, well-defined
multilayer CoTPP molecules self-assembled on Au(111) surface are characterized
layer by layer with scanning tunneling microscope (STM) induced luminescence.
By using the highly localized STM tunneling current, we not only investigate
the influence of bias polarity on the amplitude of distinct plasmonic
emission resulted from the interaction between the metal substrate
and the metal ions but also first obtain the light emission from the
hypsoporphyrins in the tunneling junction. The density-matrix method
and the combined approach of classical electrodynamics and first-principles
calculation are used to explain the mechanism of the light emission.
These findings may expand the underlying physics of plasmon–exciton
coupling in STM nanocavity and reveal a new possible path to overcome
the fluorescent potential of hypsoporphyrins by the intense localized
electric fields.
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