Berlin 2005 – wissenschaftliches Programm
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SYOO: Organic Optoelectronics and Photonics
SYOO 6: Poster
SYOO 6.56: Poster
Montag, 7. März 2005, 18:00–20:00, Poster TU A
Blue emitting organic nano-fibers grown by Hot Wall Epitaxy — •Andrei Andreev1, Francesco Quochi2, Harald Hoppe3, Helmut Sitter1, Niyazi Serdar Sariciftci3, Andrea Mura2, and Giovanni Bongiovanni2 — 1Institute for Semiconductor and Solid State Physics, University Linz, Linz, Austria — 2Dipartimento di Fisica, Università di Cagliari, Istituto Nazionale per la Fisica della Materia, I-09042 Monserrato, Italy — 3Linz Inst. f. Organic Solar Cells (LIOS), Physical Chemistry, University Linz, Austria
We focus our study on epitaxially grown structures based on para-sexiphenyl (PSP) deposited by Hot Wall Epitaxy (HWE). HWE allows to grow epilayers close to thermodynamic equilibrium, which is essential in the case of van der Waals epitaxy of oligophenylenes. Moreover, PSP molecules perform a self-organization during HWE on mica substrates. Among other optical properties of the nano-fibers, we report the observation of lasing in crystalline PSP grown by HWE on mica. Well defined parallel oriented nano-fibres with average base width and height of about 220 nm and 110 nm, respectively, pumped with sub-picosecond laser pulses, feature lasing threshold fluencies as low as 0.5 µJ/cm2 per pulse on the emission band near 425 nm, up to room temperature.