Disorder influenced optical properties of α-sexithiophene single crystals and thin evaporated films

被引:65
作者
Marks, RN
Muccini, M
Lunedi, E
Michel, RH
Murgia, M
Zamboni, R
Taliani, C
Horowitz, G
Garnier, F
Hopmeier, M
Oestreich, M
Mahrt, RF
机构
[1] Univ Marburg, FB Phys, D-35032 Marburg, Germany
[2] Univ Marburg, Inst Phys Chem, D-35032 Marburg, Germany
[3] Univ Marburg, Zentrum Mat Wissensch, D-35032 Marburg, Germany
[4] CNR, Inst Spettroscopia Mol, I-40126 Bologna, Italy
[5] CNRS, Mat Mol Lab, F-94320 Thiais, France
关键词
D O I
10.1016/S0301-0104(97)00274-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 FL. 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. (C) 1998 Elsevier Science B.V.
引用
收藏
页码:49 / 56
页数:8
相关论文
共 19 条
[1]   LOCATION OF CHARGE-TRANSFER STATES IN ALPHA-SEXITHIENYL DETERMINED BY THE ELECTROABSORPTION TECHNIQUE [J].
BLINOV, LM ;
PALTO, SP ;
RUANI, G ;
TALIANI, C ;
TEVOSOV, AA ;
YUDIN, SG ;
ZAMBONI, R .
CHEMICAL PHYSICS LETTERS, 1995, 232 (04) :401-406
[2]   PICOSECOND PHOTOINDUCED DICHROISM IN SOLUTIONS OF THIOPHENE OLIGOMERS [J].
CHARRA, F ;
FICHOU, D ;
NUNZI, JM ;
PFEFFER, N .
CHEMICAL PHYSICS LETTERS, 1992, 192 (5-6) :566-570
[3]   TIME-RESOLVED FLUORESCENCE STUDIES ON THIOPHENE OLIGOMERS IN SOLUTION [J].
CHOSROVIAN, H ;
RENTSCH, S ;
GREBNER, D ;
DAHM, DU ;
BIRCKNER, E ;
NAARMANN, H .
SYNTHETIC METALS, 1993, 60 (01) :23-26
[4]   The intramolecular vibrations of prototypical polythiophenes [J].
Degli Esposti, A ;
Moze, O ;
Taliani, C ;
Tomkinson, JT ;
Zamboni, R ;
Zerbetto, F .
JOURNAL OF CHEMICAL PHYSICS, 1996, 104 (24) :9704-9718
[5]   ORIENTATION AND MOBILITY IN ULTRATHIN OLIGOTHIOPHENE FILMS - UV-VIS, IR AND FLUORESCENCE STUDIES [J].
EGELHAAF, HJ ;
BAUERLE, P ;
RAUER, K ;
HOFFMANN, V ;
OELKRUG, D .
SYNTHETIC METALS, 1993, 61 (1-2) :143-146
[6]  
ETEMAD S, 1991, SPECTROSCOPY ADV MAT
[7]   LOW-TEMPERATURE OPTICAL-ABSORPTION OF POLYCRYSTALLINE THIN-FILMS OF ALPHA-QUATERTHIOPHENE, ALPHA-SEXITHIOPHENE AND ALPHA-OCTITHIOPHENE, 3 MODEL OLIGOMERS OF POLYTHIOPHENE [J].
FICHOU, D ;
HOROWITZ, G ;
XU, B ;
GARNIER, F .
SYNTHETIC METALS, 1992, 48 (02) :167-179
[8]   New insight into the optical properties of thin organic films by epitaxial preparation [J].
Gebauer, W ;
Bassler, M ;
Fink, R ;
Sokolowski, M ;
Umbach, E .
CHEMICAL PHYSICS LETTERS, 1997, 266 (1-2) :177-183
[9]  
GEBAUER W, 1996, THIN SOLID FILMS, V248, P576
[10]  
GEBAUER W, 1997, SYNTHETIC MET, V87, P167