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Titolo:
Spontaneous and stimulated emission from a ladder-type conjugated polymer
Autore:
Schweitzer, B; Wegmann, G; Hertel, D; Mahrt, RF; Bassler, H; Uckert, F; Scherf, U; Mullen, K;
Indirizzi:
Univ Marburg, Inst Phys Chem, D-35032 Marburg, Germany Univ Marburg Marburg Germany D-35032 Phys Chem, D-35032 Marburg, Germany Univ Marburg, Wissensch Zentrum Mat Wissensch, D-35032 Marburg, Germany Univ Marburg Marburg Germany D-35032 Wissensch, D-35032 Marburg, Germany Univ Marburg, Fachbereich Phys, Inst Phys Chem, D-35032 Marburg, Germany Univ Marburg Marburg Germany D-35032 Phys Chem, D-35032 Marburg, Germany Max Planck Inst Polymerforsch, D-55128 Mainz, Germany Max Planck Inst Polymerforsch Mainz Germany D-55128 55128 Mainz, Germany
Titolo Testata:
PHYSICAL REVIEW B-CONDENSED MATTER
fascicolo: 6, volume: 59, anno: 1999,
pagine: 4112 - 4118
SICI:
0163-1829(19990201)59:6<4112:SASEFA>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SITE-SELECTIVE FLUORESCENCE; FILMS; POLY(P-PHENYLENEVINYLENE); EXCITATIONS; SCATTERING; COPOLYMER; PHENYLENE; DYNAMICS; STATES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Schweitzer, B Univ Marburg, Inst Phys Chem, D-35032 Marburg, Germany Univ Marburg Marburg Germany D-35032 5032 Marburg, Germany
Citazione:
B. Schweitzer et al., "Spontaneous and stimulated emission from a ladder-type conjugated polymer", PHYS REV B, 59(6), 1999, pp. 4112-4118

Abstract

Fluorescence from films as well as from a solid solution of a ladder-type poly(para-phenylene) has been studied as a function of pump energy upon excitation at variable spectral positions within the inhomogeneously broadenedabsorption band. Photoinduced transmission changes following excitation with 200 fs laser pulses at 25000 cm(-1) have been recorded at variable delaytime, The latter testify on the occurrence of optical gain in the spectralrange of spontaneous emission and of absorption bleaching. The initial decay time of the gain is on the order of 1 ps. Above a certain pump power a 180 cm(-1) broad emission feature emerges from the inhomogeneously broadenedfluorescence spectrum of the film. Upon exciting within the low energy tail of the S-1 <-- S-0 0-0 absorption band sharp (7-9 cm(-1)) emission features show up, off-set from the laser line by the energies of the dominant vibrational modes of the polymer. The phenomenon is identified as amplified spontaneous emission induced by spontaneous emission from polymer segments prior to the depopulation by energy transfer towards lower energy sites. [S0163-1829(99)12805-4].

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 13:10:24