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Common luminescence intensity fluctuations of single particle and single molecules in non-conducing matrices

: Borczyskowski, C. von; Cichos, F.; Martin, J.; Schuster, J.; Issac, A.; Brabandt, J.


European physical journal special topics 144 (2007), Nr.1, S.13-25
ISSN: 1951-6355
ISSN: 1951-6401
Fraunhofer IZM ()

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 mu s 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 nonconducing environment. Detailed aspects of the dynamics are controlled by the dielectric properties of the matrix.