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Spectral narrowing in optically pumped poly ( p ‐phenylenevinylene) Films
Author(s) -
Friend Richard H.,
Denton Graham J.,
Tessler Nir,
Stevens Mark A.
Publication year - 1997
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19970090705
Subject(s) - lasing threshold , materials science , conjugated system , polymer , optoelectronics , excitation , amplified spontaneous emission , thin film , photochemistry , laser , optics , nanotechnology , composite material , chemistry , wavelength , physics , electrical engineering , engineering
Lasing in conjugated polymer thin films? Not so , according to the results presented here. As previously reported, for films of a variety of conjugated polymers on glass substrates the emission spectrum narrows with increasing optical‐pump intensity when pulsed excitation is used. A detailed study is described here of this spectral narrowing phenomenon using films of poly( p ‐phenylenevinylene) (PPV). Evidence is presented that weakens the case for lasing being the mechanism involved and supports and supports amplification of spontaneous emission by waveguiding.