Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantum information: Photons and nonclassical light III
Q 51.7: Vortrag
Donnerstag, 20. März 2014, 18:00–18:15, UDL HS3038
Triplet-Triplet-Relaxation Induced Enhancement of Saturation Emission of a Molecular Single Photon Emitter — •B. Stender1, S. F. Völker2, C. Lambert2, and J. Pflaum1,3 — 1Experimental Physics VI, University of Würzburg, D-97074 Würzburg — 2Institute of Organic Chemistry, University of Würzburg, D-97074 Würzburg — 3ZAE Bayern, D-97074 Würzburg
Previous reports on molecular based single photon sources utilized non-interacting host-guest systems. In this work we present an universal approach to enhance the emission of a single squaraine dye molecule by its interaction with a polymeric matrix. Analyzing the squaraine photon statistics in two different matrices we found an independent depopulation rate of the first excited singlet state of k21=(2.3±0.1)·108s−1 corresponding to a lifetime of t21=4.3 ns. On longer time scales however, matrix assisted relaxation process between higher triplet states of the molecular quantum emitter and the first excited triplet state of the matrix provide an additional decay channel. By this relaxation the depopulation rate of the first excited triplet state of the molecule decreases by more than one order of magnitude to k31=(0.2±0.8)·104s−1 as compared to the intrinsic rate of k31=(5.0±1.0)·104s−1 for a non-interacting system. As a result the fluorescence intensity at saturation is enhanced by about 15% from 1.5·106 cts/s to 1.7·106 cts/s. Therefore, this mechanism provides access to spectroscopic features of single photon emitters that could not be investigated so far due to their low emission intensity in standard non-interacting matrices.