Common luminescence intensity fluctuations of single particle
and single molecules in non-conducing matrices |
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| Authors: | C von Borczyskowski F Cichos J Martin J Schuster A Issac J Brabandt |
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| Institution: | (1) OSMP, TU Chemnitz, 09107 Chemnitz, Germany;(2) NanoMA, TU Chemnitz, 09107 Chemnitz, Germany;(3) POM, TU Chemnitz, 09107 Chemnitz, Germany;(4) Institute of Physics, Leipzig University, 04103 Leipzig, Germany;(5) Fraunhofer Institut IZM, 09126 Chemnitz, Germany;(6) Emory University, 201 Dowman Drive, 30322, Atlanta, Georgia, USA |
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| Abstract: | Optical spectroscopy in combination with wide field or confocal optical
microscopy enables the investigation of single quantum objects such as
organic molecules, II/VI semiconductor quantum dots and silicon nanocrystals.
They all have fluctuations of luminescence intensities on time scales longer
than μs in common. A comparison reveals that despite the large differences
of the nature of the respective quantum objects, the intensity fluctuations
are related to a slow ionisation process followed
by a trapping of the photoejected charge in the non-conducing environment.
Detailed aspects of the dynamics are controlled by the dielectric properties
of the matrix. |
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