Antibunching in the emission of a single tetrachromophoric dendritic system.
The photophysics of a dendrimer containing four chromophores are investigated at the single-molecule level. First, the multichromophoric character of single dendrimers' absorption is probed by modulating the linear polarization of the excitation beam. Subsequently, using circular polarization, the same dendrimers are excited, and their fluorescence transients are recorded. Using pulsed excitation in combination with the classical Hanbury-Brown and Twiss coincidence setup the presented data demonstrate that efficient singlet-singlet annihilation ensures that always only one photon is emitted even when several excitations are generated in an individual multichromophoric molecule.
Tinnefeld
Philip
P
Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany.
Weston
Kenneth D
KD
Vosch
Tom
T
Cotlet
Mircea
M
Weil
Tanja
T
Hofkens
Johan
J
Müllen
Klaus
K
De Schryver
Frans C
FC
Sauer
Markus
M