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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.

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European physical journal special topics 144 (2007), No.1, pp.13-25
ISSN: 1951-6355
ISSN: 1951-6401
English
Journal Article
Fraunhofer IZM ()

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 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.

: http://publica.fraunhofer.de/documents/N-64930.html