Abstract
We report on stimulated emission and optical gain in BEH-PPV polymer films at room temperature. Performing femtosecond pump-probe experiments we find very fast (≤100 fs) relaxation of excitons within a ladder of vibronic states. From spectra taken at very early times after photoexcitation we identify several vibronic transitions with a linewidth of about 8 nm. Strong coupling of excitons to these vibrations leads to stimulated emission and large optical gain of up to 104 cm-1. For a pump-probe delay of 200 fs the different tiansitions are no longer distinguishable due to broadening through spectral diffusion and exciton migration. The lifetime of the optical gain corresponds to the exciton lifetime. Population depletion by stimulated emission leads to a density dependent decay within a few hundred fs up to about 2 ps.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 131-138 |
| Number of pages | 8 |
| Journal | Physica Status Solidi (B) Basic Research |
| Volume | 206 |
| Issue number | 1 |
| State | Published - Mar 1998 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Gain dynamics in conjugated polymers at room temperature. / Spiegelberg, Ch; Schülzgen, A.; Allemand, P. M.; Kippelen, B.; Peyghambarian, Nasser N.
In: Physica Status Solidi (B) Basic Research, Vol. 206, No. 1, 03.1998, p. 131-138.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Gain dynamics in conjugated polymers at room temperature
AU - Spiegelberg, Ch
AU - Schülzgen, A.
AU - Allemand, P. M.
AU - Kippelen, B.
AU - Peyghambarian, Nasser N
PY - 1998/3
Y1 - 1998/3
N2 - We report on stimulated emission and optical gain in BEH-PPV polymer films at room temperature. Performing femtosecond pump-probe experiments we find very fast (≤100 fs) relaxation of excitons within a ladder of vibronic states. From spectra taken at very early times after photoexcitation we identify several vibronic transitions with a linewidth of about 8 nm. Strong coupling of excitons to these vibrations leads to stimulated emission and large optical gain of up to 104 cm-1. For a pump-probe delay of 200 fs the different tiansitions are no longer distinguishable due to broadening through spectral diffusion and exciton migration. The lifetime of the optical gain corresponds to the exciton lifetime. Population depletion by stimulated emission leads to a density dependent decay within a few hundred fs up to about 2 ps.
AB - We report on stimulated emission and optical gain in BEH-PPV polymer films at room temperature. Performing femtosecond pump-probe experiments we find very fast (≤100 fs) relaxation of excitons within a ladder of vibronic states. From spectra taken at very early times after photoexcitation we identify several vibronic transitions with a linewidth of about 8 nm. Strong coupling of excitons to these vibrations leads to stimulated emission and large optical gain of up to 104 cm-1. For a pump-probe delay of 200 fs the different tiansitions are no longer distinguishable due to broadening through spectral diffusion and exciton migration. The lifetime of the optical gain corresponds to the exciton lifetime. Population depletion by stimulated emission leads to a density dependent decay within a few hundred fs up to about 2 ps.
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M3 - Article
AN - SCOPUS:0040599088
VL - 206
SP - 131
EP - 138
JO - Physica Status Solidi (B): Basic Research
JF - Physica Status Solidi (B): Basic Research
SN - 0370-1972
IS - 1
ER -