| Zugriffsnummer | 18558 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Organic semiconductor distributed feedback lasers |
| Autor(in); Institution |
Kowalsky, W.; TU Braunschweig, Institut für Hochfrequenztechnik, Braunschweig, GERMANY
Rabe, T.; TU Braunschweig, Institut für Hochfrequenztechnik, Braunschweig, GERMANY
Schneider, D.; TU Braunschweig, Institut für Hochfrequenztechnik, Braunschweig, GERMANY
Johannes, H.-H.; TU Braunschweig, Institut für Hochfrequenztechnik, Braunschweig, GERMANY
Karnutsch, C.; Universität Karlsruhe, Lichttechnisches Institut, Karlsruhe, GERMANY
Gerken, M.; Universität Karlsruhe, Lichttechnisches Institut, Karlsruhe, GERMANY
Lemmer, U.; Universität Karlsruhe, Lichttechnisches Institut, Karlsruhe, GERMANY
Wang, Jing; 2.4, Quantenelektronik, PTB-Braunschweig
Weimann, Thomas; 2.4, Quantenelektronik, PTB-Braunschweig
Hinze, Peter; 2.4, Quantenelektronik, PTB-Braunschweig
Riedl, T.; TU Braunschweig, Institut für Hochfrequenztechnik, Braunschweig, GERMANY
|
| Quelle/Jahr | Nanosensing: materials and devices II:(2005), 194 - 208 |
| Schriftenreihe | Proceedings of SPIE: 6008 |
| Herausgeber(in) |
Islam, M. Saif
|
| ISBN | 0-8194-6032-X |
| Verlag | Bellingham, Wash.: SPIE |
| Konferenzangaben | Conference on Nanosensing: Materials and Devices II, Boston, 23-26, October, 2005, USA |
| Freie Schlagworte | organic solid state laser ; distributed feedback laser ; laser threshold ; organic light emitting diode |
| Zusammenfassung | Compared to well established liquid based dye lasers, amplifying media based on amorphous organic thin films allow the realisation of versatile, cost effective and compact lasers. Aside from that, the materials involved are organic semiconductors, which in principle allow the fabrication of future electrically driven organic laser diodes. A highly promising, low-loss resonator geometry for these lasers is the distributed feedback (DFB) structure, which is based on a periodic modulation of the refractive index in the waveguide on the nanometer scale. By variation of the grating period λ one may tune the laser emission within the gain spectrum of the amplifying medium. We will demonstrate organic lasers spanning the entire spectral region from 360-715 nm. Tuning ranges as large as 115 nm (λ = 598-713 nm) in the red spectral region and more than 30 nm (λ = 362-394 nm) in the UV render these novel lasers highly attractive for various spectroscopic applications. As the grating period .lamdba. is typically between 100 nm and 400 nm the DFB resonators are fabricated by e-beam lithography. These gratings may, however, be used as masters to obtain an arbitrary amount of copies by nanoimprint lithography into plastic substrates. Therefore these lasers are very attractive even for single-use applications (e.g. in medicine and biotechnology). Today, the key challenge in the field is the realisation of the first electrically driven organic laser. Key pre-requisites are highly efficient amplifying material systems which allow for low threshold operation and charge transport materials that bring about the stability to sustain the necessary current densities, several orders of magnitude higher than in OLEDs. We will demonstrate diode structures operated electrically under pulsed conditions at current densities up to 760 A/cm² with a product of the current density and the external quantum effciency (J × ηext) of 1.27 A/cm². Mechanisms deteriorating the quantum effciency at elevated current densities will be discussed. |
Zitierung
Kowalsky, W., Rabe, T., Schneider, D., Johannes, H.-H., Karnutsch, C., Gerken, M., Lemmer, U., Wang, J., Weimann, T., Hinze, P., & Riedl, T. (2005). Organic semiconductor distributed feedback lasers. Conference on Nanosensing: Materials and Devices II, Boston, 23-26, October, 2005, USA.