EVIDENCE OF EXCITON-EXCITON BINDING IN A MOLECULAR AGGREGATE

Citation
A. Chakrabarti et al., EVIDENCE OF EXCITON-EXCITON BINDING IN A MOLECULAR AGGREGATE, Physical review. B, Condensed matter, 57(8), 1998, pp. 4206-4209
Citations number
23
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
57
Issue
8
Year of publication
1998
Pages
4206 - 4209
Database
ISI
SICI code
0163-1829(1998)57:8<4206:EOEBIA>2.0.ZU;2-M
Abstract
We present evidence for a biexciton state In a molecular aggregate. Fe mtosecond pump-probe spectroscopy of the H aggregate of an epitaxially grown trivalent metal-halogen-phthalocyanine gives distinct photoindu ced absorptions to a continuum of two-exciton states and to a bound bi exciton state. No signature of the biexciton is found in the J aggrega te of a very similar trivalent metal-halogen-phthalocyanine. The stron g exciton-exciton interaction in the H-aggregate system has its origin in the unique cofacial stacking of the molecular components in this m aterial. [S0163-1829(98)51608-6].