Title :
Gain dynamics in oriented thin films of an oligo(para-phenylene vinylene)
Author :
Barisien, T. ; Pham, T.A. ; Guidoni, L. ; Bigot, J.-Y.
Author_Institution :
Inst. de Phys. et Chimie des Mater., Strasbourg, France
Abstract :
Summary form only given. Numerous factors which govern the efficiency of the stimulated emission process in thin films of electroluminescent conjugated oligomers are related to the structural properties of the materials. Among them the effects of molecular orientation are of major interest. It is indeed fundamental to know whether an ordered phase of oligomers is necessary to walkover the threshold of the stimulated emission. We study the role of the molecular orientation by investigating the photo-excited states dynamics of crystalline thin films of the 5-ring n-octyloxy-substituted oligo(p-phenylene vinylene) (Ooct-OPV5) with femtosecond pump-probe spectroscopy. In particular we compare the emission properties and gain dynamics of two categories of crystalline films characterized by different degrees of structural disorder.
Keywords :
excited states; high-speed optical techniques; molecular orientation; optical films; organic compounds; photoexcitation; photoluminescence; stimulated emission; superradiance; thin films; time resolved spectra; crystalline films; crystalline thin films; efficiency; electroluminescent conjugated oligomers; emission properties; femtosecond pump-probe spectroscopy; gain dynamics; molecular orientation; n-octyloxy-substituted oligo(p-phenylene vinylene); oligo(para-phenylene vinylene); oligomers; ordered phase; oriented thin films; photo-excited states dynamics; stimulated emission; stimulated emission process; structural disorder; structural properties; thin films; Distributed control; Spectroscopy; Transistors;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2000. (QELS 2000). Technical Digest
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-608-7
