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Annihilation Dynamics of the Luminescence in Oriented Poly‐(p‐Phenylene Vinylene)
Author(s) -
Haring Bolivar P.,
Wegmann G.,
Leising G.,
Kurz H.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199801)205:1<319::aid-pssb319>3.0.co;2-s
Subject(s) - annihilation , luminescence , photoluminescence , materials science , excitation , exciton , phenylene , femtosecond , photochemistry , quenching (fluorescence) , molecular physics , poly(p phenylene vinylene) , polarization (electrochemistry) , electroluminescence , chemical physics , optoelectronics , fluorescence , chemistry , condensed matter physics , polymer , nanotechnology , physics , optics , nuclear physics , laser , layer (electronics) , quantum mechanics , composite material
We present a femtosecond time‐resolved analysis of the luminescence dynamics, especially of the emission efficiency, in oriented poly‐(p‐phenylene vinylene) (PPV). The investigations are based on photoluminescence up‐conversion experiments. Strong dependencies of the PL efficiency on lattice temperature ( T = 8 to 300 K), excitation density and polarization of the excitation are observed. From these data we infer two specific annihilation processes which substantially hamper the emission from this type of materials. A temperature activated transport into nonradiative traps as well as an additional bimolecular luminescence quenching channel, probably due to singlet–triplet exciton annihilation, are observed.