We have found that fluorescence emission of binary films composed of fluorescent amorphous molecular materials, 4-[bis(4methylphenylaryl)amino]benzaldehyde (BMABA) and 4-[bis(4methylphenylaryl)amino]acetophenone (BMAAP), with p-toluenesulfonic acid (TsOH) was quenched at ambient dry atmosphere but enhanced when we breathed onto their films. When pausing the breath, the emission was again quenched. Moisture in the exhaled breath was suggested to play a role for such phenomena. It was suggested that some BMABA and BMAAP molecules were protonated in their films as prepared at ambient dry atmosphere and that protonation and deprotonation took place corresponding to change in surrounding humidity, resulting in modulation of emission intensity.
The current-voltage (I-V) characteristics of organic molecules anchored covalently to silicon surfaces were studied with a scanning tunneling microscope in ultrahigh vacuum. It was found that molecules on silicon were not stable in the I-V measurement. Molecules were removed during the measurement, which was possibly induced by charge injection. Artificial negative differential resistance was sometimes recorded in the I-V plot. The origin of this event was explained by deformation and=or desorption of molecules induced by the charge injection during observation.
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