Details
| Original language | English |
|---|---|
| Pages (from-to) | 49-56 |
| Number of pages | 8 |
| Journal | Chemical Physics |
| Volume | 227 |
| Issue number | 1-2 |
| Publication status | Published - 1 Feb 1998 |
| Externally published | Yes |
Abstract
We report measurements on steady state and time resolved photoluminescence (PL) and PL-excitation (PLE) of sexithiophene single crystals and evaporated thin films. In contrast to the broad spectral features usually observed even in crystals, we have observed for the first time sharp emission peaks from the single crystal superimposed on a broader background. The broad background is due to emission from defect states, which are observable in PLE measurements and site-selective PL. These defect states are visible both in films and crystals, but their density and nature are strongly dependent on the growth conditions. Additionally in the film a fast energy transfer from the primary excited molecular states to defect states is observed on a sub 100 ps timescale whereas the fluorescence lifetime of these defects is around 700 ps.
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In: Chemical Physics, Vol. 227, No. 1-2, 01.02.1998, p. 49-56.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Disorder influenced optical properties of α-sexithiophene single crystals and thin evaporated films
AU - Marks, R. N.
AU - Muccini, M.
AU - Lunedi, E.
AU - Michel, R. H.
AU - Murgia, M.
AU - Zamboni, R.
AU - Taliani, C.
AU - Horowitz, G.
AU - Garnier, F.
AU - Hopmeier, M.
AU - Oestreich, Michael
AU - Mahrt, Rainer E.
N1 - Funding information: We are grateful to Prof. H. B~issler and Prof. W.W. Riihle for stimulating discussions. This work was partly supported by the European Community (SELOA and LEDFOS), Sonderforschungsbereich 383 and the Volkswagen-Stiftung. RFM gratefully acknowledges financial support by the Deutsche Forschungsgemeinschaft. We are grateful to Hama- matsu Photonics Italia for financial support with the PMA-11 Optical Multichannel Analyser.
PY - 1998/2/1
Y1 - 1998/2/1
N2 - We report measurements on steady state and time resolved photoluminescence (PL) and PL-excitation (PLE) of sexithiophene single crystals and evaporated thin films. In contrast to the broad spectral features usually observed even in crystals, we have observed for the first time sharp emission peaks from the single crystal superimposed on a broader background. The broad background is due to emission from defect states, which are observable in PLE measurements and site-selective PL. These defect states are visible both in films and crystals, but their density and nature are strongly dependent on the growth conditions. Additionally in the film a fast energy transfer from the primary excited molecular states to defect states is observed on a sub 100 ps timescale whereas the fluorescence lifetime of these defects is around 700 ps.
AB - We report measurements on steady state and time resolved photoluminescence (PL) and PL-excitation (PLE) of sexithiophene single crystals and evaporated thin films. In contrast to the broad spectral features usually observed even in crystals, we have observed for the first time sharp emission peaks from the single crystal superimposed on a broader background. The broad background is due to emission from defect states, which are observable in PLE measurements and site-selective PL. These defect states are visible both in films and crystals, but their density and nature are strongly dependent on the growth conditions. Additionally in the film a fast energy transfer from the primary excited molecular states to defect states is observed on a sub 100 ps timescale whereas the fluorescence lifetime of these defects is around 700 ps.
UR - http://www.scopus.com/inward/record.url?scp=0002183865&partnerID=8YFLogxK
U2 - 10.1016/S0301-0104(97)00274-7
DO - 10.1016/S0301-0104(97)00274-7
M3 - Article
AN - SCOPUS:0002183865
VL - 227
SP - 49
EP - 56
JO - Chemical Physics
JF - Chemical Physics
SN - 0301-0104
IS - 1-2
ER -