Hybrid dendritic molecules with confined chromophore architecture to tune fluorescence efficiency.
The aim of this publication is to present a general strategy to engineer more efficient photoluminescent dendritic molecules based on polyhedral oligomeric silsesquioxane (POSS) cores. A series of chromophores were grafted on POSS cores to form dendritic molecules for which steric hindrance was used as a trigger to tune their photophysical properties. For fluorescence in the blue/near-UV spectral ranges, 4-vinylbiphenyl molecules were chosen as model chromophores to present a general approach based on stable chemistry and bulky groups grafted to the chromophores to enhance photoluminescence efficiency of the dendritic molecules. Photoluminescence quantum yields as well as steady-state and time-resolved solution spectroscopy along with molecular dynamics investigation and electronic structure calculations on a family of new materials are reported. We highlight an apparent contrast between free chromophore and dendritic molecules photophysical properties and show that chromophores' engineering and confinement around an inorganic core allows the design of more efficient photoluminescent dendritic molecules relevant to sensors and hybrid light-emitting diodes.
SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife, UK KY16 9SS. Pascal.Andre@st-andrews.ac.uk
Pascal
P
André
Ge
G
Cheng
Arvydas
A
Ruseckas
Tanja
T
van Mourik
Herbert
H
Früchtl
Joe A
JA
Crayston
Russell E
RE
Morris
David
D
Cole-Hamilton
Ifor D W
ID
Samuel