TY - JOUR
T1 - Excimer Diffusivity in 9,10-Bis(phenylethynyl)anthracene Assemblies on Anodic Aluminum Oxide Membranes
AU - Myong, Michele S.
AU - Young, Ryan M.
AU - Wasielewski, Michael R.
N1 - Funding Information:
This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award DE-FG02-99ER14999 (M.R.W.). M.S.M. was supported by an NSF Graduate Research Fellowship under Grant DGE-1842165. Use was made of the IMSERC Facility at Northwestern University, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205) and Northwestern University.
Publisher Copyright:
©
PY - 2021/11/11
Y1 - 2021/11/11
N2 - Excimers usually serve as low energy trap sites in supramolecular chromophore assemblies; however, if the trap is not too deep, excimers may diffuse throughout the structure, making it possible to deliver excitation energy to distant sites. To investigate this phenomenon, a supramolecular assembly of 9,10-bis(phenylethynyl)anthracene (BPEA) chromophores was prepared by covalently linking a BPEA molecule to the walls of nanoporous anodic aluminum oxide (AAO) membranes. The BPEA molecules self-associate and form excimers upon photoexcitation. Excimer formation in the BPEA assemblies on the AAO membranes is a multistep process and involves intermolecular structural reorganization between the chromophores. Describing the system using exciton theory reveals that the BPEA excimer is mobile, despite its frequent role as a lower energy trap state. The excimer diffusivity in the BPEA on the AAO membranes is higher than that of other reported excimers, approaching that of singlet excitons in efficient organic photovoltaic systems.
AB - Excimers usually serve as low energy trap sites in supramolecular chromophore assemblies; however, if the trap is not too deep, excimers may diffuse throughout the structure, making it possible to deliver excitation energy to distant sites. To investigate this phenomenon, a supramolecular assembly of 9,10-bis(phenylethynyl)anthracene (BPEA) chromophores was prepared by covalently linking a BPEA molecule to the walls of nanoporous anodic aluminum oxide (AAO) membranes. The BPEA molecules self-associate and form excimers upon photoexcitation. Excimer formation in the BPEA assemblies on the AAO membranes is a multistep process and involves intermolecular structural reorganization between the chromophores. Describing the system using exciton theory reveals that the BPEA excimer is mobile, despite its frequent role as a lower energy trap state. The excimer diffusivity in the BPEA on the AAO membranes is higher than that of other reported excimers, approaching that of singlet excitons in efficient organic photovoltaic systems.
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U2 - 10.1021/acs.jpcc.1c06927
DO - 10.1021/acs.jpcc.1c06927
M3 - Article
AN - SCOPUS:85118916198
VL - 125
SP - 24498
EP - 24504
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 44
ER -
