Details
| Original language | English |
|---|---|
| Pages (from-to) | 416-419 |
| Number of pages | 4 |
| Journal | Journal of Luminescence |
| Volume | 76-77 |
| Publication status | Published - Feb 1998 |
| Externally published | Yes |
Abstract
We have investigated the disorder-determined optical properties of α-sexithiophene by comparing measurements of an evaporated film and a single crystal. We observed for the first time sharp lines in absorption and photoluminescence from both samples representing the intrinsic electronic properties of the material. The time-integrated emission spectra of both samples are dominated by radiative trap emission, which is more pronounced in the film due to the higher degree of disorder. Photoluminescence excitation and site-selective photoluminescence measurements show the different origin and character of the traps in the samples. We attribute the single crystal traps to the so-called X-traps while the nature of the traps in the film is still undetermined. Time-resolved photoluminescence measurements of the film show a fast transfer process of the sharp bulk emitters to the unstructured trap emission within the first 50 ps after excitation. A comparable process is observable in the single crystal, showing a slower dynamics due to lower trap density.
Keywords
- Oligothiophene, Optical properties, Structural disorder, Time-resolved photoluminescence
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biophysics
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Chemistry(all)
- General Chemistry
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Journal of Luminescence, Vol. 76-77, 02.1998, p. 416-419.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Excitation dynamics in α-sexithiophene single crystals and UHV-grown films
AU - Hopmeier, M.
AU - Marks, R. N.
AU - Michel, Rudi H.
AU - Muccini, M.
AU - Murgia, M.
AU - Zamboni, R.
AU - Taliani, C.
AU - Horowitz, G.
AU - Garnier, F.
AU - Oestreich, Michael
AU - Mahrt, Rainer E.
N1 - Funding information: This work was supported by the European Community (SELOA and LEDFOS), Sonderforschun-gsbereich 383, the Volkswagenstiftung and the Deutsche Forschungsgemeinschaft. We would like to thank Prof. H. Bassler and Prof. W.W. Ruble for fruitful and stimulating discussions.
PY - 1998/2
Y1 - 1998/2
N2 - We have investigated the disorder-determined optical properties of α-sexithiophene by comparing measurements of an evaporated film and a single crystal. We observed for the first time sharp lines in absorption and photoluminescence from both samples representing the intrinsic electronic properties of the material. The time-integrated emission spectra of both samples are dominated by radiative trap emission, which is more pronounced in the film due to the higher degree of disorder. Photoluminescence excitation and site-selective photoluminescence measurements show the different origin and character of the traps in the samples. We attribute the single crystal traps to the so-called X-traps while the nature of the traps in the film is still undetermined. Time-resolved photoluminescence measurements of the film show a fast transfer process of the sharp bulk emitters to the unstructured trap emission within the first 50 ps after excitation. A comparable process is observable in the single crystal, showing a slower dynamics due to lower trap density.
AB - We have investigated the disorder-determined optical properties of α-sexithiophene by comparing measurements of an evaporated film and a single crystal. We observed for the first time sharp lines in absorption and photoluminescence from both samples representing the intrinsic electronic properties of the material. The time-integrated emission spectra of both samples are dominated by radiative trap emission, which is more pronounced in the film due to the higher degree of disorder. Photoluminescence excitation and site-selective photoluminescence measurements show the different origin and character of the traps in the samples. We attribute the single crystal traps to the so-called X-traps while the nature of the traps in the film is still undetermined. Time-resolved photoluminescence measurements of the film show a fast transfer process of the sharp bulk emitters to the unstructured trap emission within the first 50 ps after excitation. A comparable process is observable in the single crystal, showing a slower dynamics due to lower trap density.
KW - Oligothiophene
KW - Optical properties
KW - Structural disorder
KW - Time-resolved photoluminescence
UR - http://www.scopus.com/inward/record.url?scp=4243668741&partnerID=8YFLogxK
U2 - 10.1016/S0022-2313(97)00229-9
DO - 10.1016/S0022-2313(97)00229-9
M3 - Article
AN - SCOPUS:4243668741
VL - 76-77
SP - 416
EP - 419
JO - Journal of Luminescence
JF - Journal of Luminescence
SN - 0022-2313
ER -