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Sökning: WAKA:ref > Inganäs Olle > Andersson Mats > Granlund Thomas

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  • Berggren, Magnus, et al. (författare)
  • Polymer light-emitting diodes placed in microcavities
  • 1996
  • Ingår i: Synthetic metals. - Elsevier. - 0379-6779. ; 76:1-3, s. 121-123
  • Tidskriftsartikel (refereegranskat)abstract
    • The use of resonant optical microcavities to influence the emission properties of conjugated polymer light-emitting diodes (LEDs) is reported. The microcavities, which are built using metallic mirrors and polymeric spacers, incorporate polymer LEDs in between the mirrors. We report experimental results of polymer LEDs based on substituted polythiophenes. The effects include substantial narrowing of the spectral width of the emitted light, enhancement of the emission at the microcavity resonance, and coupling of two emission processes to different resonance modes in the same cavity.
  • Granlund, Thomas, et al. (författare)
  • Lasing in substituted polythiophene between dielectric mirrors
  • 1999
  • Ingår i: Synthetic metals. - Elsevier. - 0379-6779. ; 102:1-3, s. 1038-1041
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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