Lasing in substituted polythiophene between dielectric mirrors

• Published in: Synthetic metals Vol. 102; no. 1; pp. 1038 - 1041
• Main Authors: Granlund, Thomas, Theander, Mathias, Berggren, Magnus, Andersson, Mats, Ruzeckas, Arvydas, Sundström, Villy, Björk, Gunnar, Granström, Magnus, Inganäs, Olle
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 01.06.1999; Amsterdam Elsevier Science; New York, NY
• Subjects: Application fields; Applied sciences; Electronics; Exact sciences and technology; Laser; microcavity; Optoelectronic devices; Photopumped; Polymer; Polymer industry, paints, wood; polythiophene; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; TECHNOLOGY; Technology of polymers; TEKNIKVETENSKAP; Photopumped; Polymer; microcavity; polythiophene; Laser; polymer; laser; photopumped
• ISSN: 0379-6779; 1879-3290; 1879-3290
• DOI: 10.1016/S0379-6779(98)00227-6

We report photopumped lasing in a microcavity device with a polythiophene layer as emitter. The microcavity is made of a polymer film between two dielectric Bragg reflecting mirrors (DBR). The microcavity devices is built by joining two polymer coated DBR mirrors at elevated temperature. When photopumping the film, a lasing threshold is observed at 120 nJ/cm 2. Comparative studies with fast pump-probe spectroscopy of thin polythiophene films and the same polymer in photopumped lasing studies, indicate that the gain coefficient is 80±20 cm 2, and that the exciton concentration is 2x10 17 cm 2 at the lasing transition, well below the exciton-exciton recombination level.