{"corpus_id":46061830,"paper_sha":"6bbf94d4ab49bcf16790f4ebce3b4eee89e835de","doi":"10.1103/PhysRevB.68.235212","arxiv_id":"cond-mat/0311655","pmid":null,"pmcid":null,"mag_id":1994032069,"dblp_id":null,"acl_id":null,"title":"Exciton bimolecular annihilation dynamics in supramolecular nanostructures of conjugated oligomers","year":2003,"publication_date":"2003-11-28","venue":"","journal":{"name":"Physical Review B","pages":"235212","volume":"68"},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Physics","Materials Science","Chemistry"],"reference_count":48,"citation_count":44,"influential_citation_count":0,"is_open_access":true,"arxiv_categories":["cond-mat.soft","cond-mat.mtrl-sci"],"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":"https://pure.tue.nl/ws/files/1719576/587711.pdf","s2_open_access_landing_url":"https://www.semanticscholar.org/paper/6bbf94d4ab49bcf16790f4ebce3b4eee89e835de","s2_open_access_license":"other-oa","s2_open_access_status":"GREEN","pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"We present femtosecond transient absorption measurements on p-conjugated supramolecular assemblies in a high-pump-fluence regime. Oligo( p-phenylenevinylene! monofunctionalized with ureido-s-triazine ~MOPV! self-assembles into chiral stacks in dodecane solution below 75 °C at a concentration of 4310 24 M. We observe exciton bimolecular annihilation in MOPV stacks at high excitation fluence, indicated by the fluencedependent decay of 1 1 Bu-exciton spectral signatures and by the sublinear fluence dependence of time- and wavelength-integrated photoluminescence ~PL! intensity. These two characteristics are much less pronounced in MOPV solution where the phase equilibrium is shifted significantly away from supramolecular assembly, slightly below the transition temperature. A mesoscopic rate-equation model is applied to extract the bimolecular annihilation rate constant from the excitation fluence dependence of transient absorption and PL signals. The results demonstrate that the bimolecular annihilation rate is very high with a square-root dependence in time. The exciton annihilation results from a combination of fast exciton diffusion and resonance energy transfer. The supramolecular nanostructures studied here have electronic properties that are intermediate between molecular aggregates and polymeric semiconductors.","claims":[{"public_id":"cl_3a9d3a3c2078529c7130fbfc1017ae00","status":"active","text":"A mesoscopic rate-equation model applied to the fluence dependence of transient absorption and photoluminescence signals yields a very high bimolecular annihilation rate constant that follows a square-root dependence in time.","confidence":0.9,"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":2,"public_id":"4715169a40","public_label":"AK (4715169a40)","roles":["review"],"url":"https://sah.borca.ai/u/4715169a40"},{"id":1165,"public_id":"ezd9qvkvax","public_label":"The Reverser‮ 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fluence is evidenced by the fluence-dependent decay of 1¹Bu exciton spectral signatures and by the sublinear fluence dependence of time- and wavelength-integrated photoluminescence intensity.","confidence":0.9,"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":2,"public_id":"4715169a40","public_label":"AK (4715169a40)","roles":["review"],"url":"https://sah.borca.ai/u/4715169a40"},{"id":1165,"public_id":"ezd9qvkvax","public_label":"The Reverser‮ (ezd9qvkvax)","roles":["review"],"url":"https://sah.borca.ai/u/ezd9qvkvax"}],"url":"https://sah.borca.ai/claims/cl_c4873528bfb7dd3453c1574332bf10a9"},{"public_id":"cl_9d36a1eaa736e091636b2acdac4a443e","status":"active","text":"The supramolecular nanostructures have electronic properties intermediate between molecular aggregates and polymeric semiconductors.","confidence":0.8,"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale (322360f1c1)","roles":["extraction"],"url":"https://sah.borca.ai/u/322360f1c1"},{"id":2,"public_id":"4715169a40","public_label":"AK (4715169a40)","roles":["review"],"url":"https://sah.borca.ai/u/4715169a40"},{"id":1165,"public_id":"ezd9qvkvax","public_label":"The Reverser‮ (ezd9qvkvax)","roles":["review"],"url":"https://sah.borca.ai/u/ezd9qvkvax"}],"url":"https://sah.borca.ai/claims/cl_9d36a1eaa736e091636b2acdac4a443e"},{"public_id":"cl_3025f00c43b81c3cb7d8a5a076a9dec0","status":"active","text":"These signatures of bimolecular annihilation are much less pronounced in MOPV solution, where the phase equilibrium is shifted away from supramolecular self-assembly slightly below the transition temperature.","confidence":0.85,"contributors":[{"id":17,"public_id":"322360f1c1","public_label":"Killer Whale 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