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Titolo:
Phonon sidebands and optical gain of light-emitting conjugated polymers
Autore:
Meng, HF; Chang, VCH;
Indirizzi:
Natl Chiao Tung Univ, Inst Phys, Hsinchu 300, Taiwan Natl Chiao Tung UnivHsinchu Taiwan 300 , Inst Phys, Hsinchu 300, Taiwan Natl Taiwan Normal Univ, Dept Phys, Taipei 116, Taiwan Natl Taiwan Normal Univ Taipei Taiwan 116 Dept Phys, Taipei 116, Taiwan Natl Ctr Theoret Sci, Hsinchu 300, Taiwan Natl Ctr Theoret Sci Hsinchu Taiwan 300 Theoret Sci, Hsinchu 300, Taiwan
Titolo Testata:
PHYSICAL REVIEW B-CONDENSED MATTER
fascicolo: 20, volume: 60, anno: 1999,
pagine: 14242 - 14254
SICI:
0163-1829(19991115)60:20<14242:PSAOGO>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SITE-SELECTIVE FLUORESCENCE; POLY(PHENYLENE VINYLENE); POLAR SEMICONDUCTORS; EXCITONS; EMISSION; ENERGIES; FILMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Meng, HF Natl Chiao Tung Univ, Inst Phys, Hsinchu 300, Taiwan Natl Chiao Tung Univ Hsinchu Taiwan 300 ys, Hsinchu 300, Taiwan
Citazione:
H.F. Meng e V.C.H. Chang, "Phonon sidebands and optical gain of light-emitting conjugated polymers", PHYS REV B, 60(20), 1999, pp. 14242-14254

Abstract

We study the interaction of excitons and optical phonons in light-emittingconjugated polymers with the variational approach. The optical transition matrix elements for the phonon sidebands in the absorption and emission spectra an calculated. The electron-phonon coupling constant is determined by fitting the theoretical oscillator strengths of the emission sidebands withthe experimental photoluminescence spectra for the various poly(p-phenylene vinylene) derivatives. Using this coupling constant, we predict that the absorption one-phonon sideband is as important as the zero-phonon sideband for the ideal systems. Taking the experimental data of the peak absorption coefficient as input, we obtain the optical gain coefficient for a wide range of exciton densities. The gain is found to be determined by the exciton density no by a general expression 1.98 x 10(-16)n(o) cm(2), which is in good agreement with experiments. [S0163-1829(99)06243-8].

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Documento generato il 01/12/20 alle ore 13:38:42