Berlin 2005 – wissenschaftliches Programm
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SYOO: Organic Optoelectronics and Photonics
SYOO 2: Optoelectronic Properties
SYOO 2.5: Vortrag
Montag, 7. März 2005, 12:30–12:45, TU C130
Widely tunable organic semiconductor lasers for the entire visible spectrum — •Torsten Rabe1, Daniel Schneider1, Matthias Hoping1, Thomas Dobbertin1, Michael Kröger1, Thomas Riedl1, Hans-Hermann Johannes1, Wolfgang Kowalsky1, Thomas Weimann2, Jing Wang2, and Peter Hinze2 — 1Institut fuer Hochfrequenztechnik, Technische Universitaet Braunschweig, 38092 Braunschweig, Germany — 2Physikalisch-Technische Bundesanstalt Braunschweig, Bundesallee 100, 38116 Braunschweig, Germany
We report on organic semiconductor lasers emitting from the deep red to the near ultra violet using only a few different organic materials as active media. The guest-host system DCMII:Alq3 is well known for lasing in the red spectral region. We demonstrate an ultra wide tuning range of more than 115 nm by variation of the grating period of a second order distributed feedback (DFB) resonator. Furthermore we introduce various guest-host systems for blue-green DFB-structures. In an all-spiro system (consisting of a Spiro-sexiphenylene compound doped with Spiro-DPVBI (1.1wt%)) we observe first order DFB-lasing with laser thresholds as low as 320 nJ/cm2 at 478.0 nm. With the pure sexiphenylene compound we obtain laser emission between 401.5 nm and 434.2 nm, using a quaterphenylene derivative even between 377.7 nm and 394.8 nm. The tunability of the neat materials are still 32.7 nm and 17.1 nm, respectively. Hence, using these few materials we are able to cover almost the entire visible spectrum. All these lasers base on thin film DFB-structures and are highly attractive for disposable laser sources for examble in bio-analytical spectroscopy.