TY  - JOUR
A1  - Müller, Ulrich
A1  - Spenst, Peter
A1  - Kagerer, Philipp
A1  - Stolte, Matthias
A1  - Würthner, Frank
A1  - Pflaum, Jens
T1  - Photon‐Correlation Studies on Multichromophore Macrocycles of Perylene Dyes
JF  - Advanced Optical Materials
N2  - Organic dyes offer unique properties for their application as room temperature single photon emitters. By means of photon‐correlation, the emission characteristics of macrocyclic para‐xylylene linked perylene bisimide (PBI) trimers and tetramers dispersed in polymethyl methacrylate matrices are analyzed. The optical data indicate that, despite of the strong emission enhancement of PBI trimers and tetramers according to their larger number of chromophores, the photon‐correlation statistics still obeys that of single photon emitters. Moreover, driving PBI trimers and tetramers at higher excitation powers, saturated emission behavior for monomers is found while macrocycle emission is still far‐off saturation but shows enhanced fluctuations. This observation is attributed to fast singlet–singlet annihilation, i.e., faster than the radiative lifetime of the excited S1 state, and the enlarged number of conformational arrangements of multichromophores in the polymeric host. Finally, embedding trimeric PBI macrocycles in active organic light‐emitting diode matrices, electrically driven bright fluorescence together with an indication for antibunching at room temperature can be detected. This, so far, has only been observed for phosphorescent emitters that feature much longer lifetimes of the excited states and, thus, smaller radiative recombination rates. The results are discussed in the context of possible effects on the g(2) behavior of molecular emitters.
KW  - multichromophores
KW  - organic light emitting diodes
KW  - perylene dyes
KW  - photon‐correlation
KW  - single photon emission
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-287219
VL  - 10
IS  - 14
ER  - 
TY  - THES
A1  - Schulze, Marcus
T1  - Ruthenium Complexes as Water Oxidation Catalysts and Photosensitizers
T1  - Rutheniumkomplexe als Wasseroxidationskatalysatoren und Photosensibilisatoren
N2  - In der vorliegenden Arbeit werden Aspekte der photokatalytischen Wasseroxidationsreaktion behandelt. Der erste Themenschwerpunkt der Dissertation beschäftigt sich mit einem supramolekularen Makrozyklus, der drei Rutheniummetallzentren enthält. Dieser neuartige Katalysator zeigt eine sehr hohe katalytische Aktivität und gewährt neue Einblicke in den Mechanismus der Wasseroxidationsreaktion. Des Weiteren wird auf die  mit Licht interagierenden Komponenten der photokatalytischen Wasseroxidation eingegangen. Hierbei haben sich azabenz-anellierte Perylenderivate als vielseitige Farbstoffklasse herausgestellt. Die Kombination dieser Farbstoffe mit Metallkomplexen liefert metallorganische Verbindungen, die als Photosensibilisatoren eingesetzt werden können.
N2  - The thesis discusses aspects of the photocatalytic water oxidation reaction. The first chapter deals with a supramolecular macrocycle which contains three ruthenium metal centers. This novel catalyst shows promising catalytic activity and provides insides into the mechanism of the water oxidation reaction.  After this part, the focus lies on the light interacting components of the photocatalytic water oxidation.  In this regard, the azabenz-annulated perylene derivatives appeared to be a promising dye class. The combination of these chromophores and metal complexes result in metal organic compounds, which have photosensitizer potential.
KW  - Farbstoff
KW  - Ruthenium
KW  - Fotokatalyse
KW  - Photosensibilisator
KW  - Makrozyklus
KW  - macrocycle
KW  - Wasseroxidationsreaktion
KW  - water oxidation reation
KW  - Perylen-Farbstoffe
KW  - perylene dyes
KW  - Katalyse
KW  - Wasserspaltung
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-142454
ER  -