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Träfflista för sökning "WFRF:(Inganäs Olle) srt2:(1995-1999)"

Sökning: WFRF:(Inganäs Olle) > (1995-1999)

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1.
  • Andersson, Mats R., et al. (författare)
  • Electroluminescence from Substituted Poly(thiophenes) : From Blue to Near-Infrared
  • 1995
  • Ingår i: Macromolecules. - : American Chemical Society. - 0024-9297 .- 1520-5835. ; 28:22, s. 7525-7529
  • Tidskriftsartikel (refereegranskat)abstract
    • We report a systematic approach to the control of the conjugation length along the poly(thiophene) backbone. The planarity of the main chain can be permanently modified by altering the pattern of substitution and character of the substituents on the poly(thiophene) chain, and the conjugation length is thus modified. We obtain blue, green, orange, red, and near-infrared electroluminescence from four chemically distinct poly(thiophenes). The external quantum efficiencies are in the range of 0.01-0.6%.
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2.
  • Andersson, Mats R., et al. (författare)
  • Improved photoluminescence efficiency of films from conjugated polymers
  • 1997
  • Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 85:1-3, s. 1383-1384
  • Tidskriftsartikel (refereegranskat)abstract
    • We have demonstrated two general ways to increase the photoluminescence efficiency of films from conjugated polymers. One is to disperse the conjugated polymer on a molecular level by using attractive forces between the conjugated polymer and the matrix. The other method is to substitute the conjugated polymer with side chains which separates the conjugated backbones. Using this idea a new poly(thiophene) with a photoluminescence efficiency of 16% in films has been prepared. LEDs from this polymer exhibit an external efficiency of 0.1% for single layer and 0.7% for double layer diodes.
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3.
  • Andersson, Mats R., et al. (författare)
  • Synthesis of poly(alkylthiophenes) for light-emitting diodes
  • 1995
  • Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 71:1-3, s. 2183-2184
  • Tidskriftsartikel (refereegranskat)abstract
    • We have demonstrated a general way to tune the emission of poly(alkylthiophenes) by using steric interaction between the repeating units. Light-emitting diodes prepared of the polymers have blue to near-infrared emission.
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4.
  • Berggren, Magnus, et al. (författare)
  • Controlling colour by voltage in polymer light emitting diodes
  • 1995
  • Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 71:1-3, s. 2185-2186
  • Tidskriftsartikel (refereegranskat)abstract
    • We report electroluminescence using different substituted polythiophenes as the emitting mterial. Different substituents cause different sterical interacion which force the thiophene rings out of planarity. This results in different bandgaps. Colours from blue to near infrared have been demonstrated in electroluminescent devices. We also demonstrate voltage controlled electroluminescence using mixtures of these polymers.
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5.
  • Berggren, Magnus, et al. (författare)
  • Controlling inter-chain and intra-chain excitations of a poly(thiophene) derivative in thin films
  • 1999
  • Ingår i: Chemical Physics Letters. - : Elsevier. - 0009-2614 .- 1873-4448. ; 304:1-2, s. 84-90
  • Tidskriftsartikel (refereegranskat)abstract
    • The decay of photoexcitations in polythiophene chains has been studied in solid solutions of the polymer from room temperature to 4 K. A strong blue shift of the emission spectrum is observed in the polymer blend, as compared to the homopolymer. Dispersion of the polythiophene suppresses the non-radiative processes, which are suggested to be correlated to close contacts of polymer chains. Quantum chemistry modeling of the excited state distributed on two chains corroborate this conclusion.
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6.
  • Berggren, Magnus, et al. (författare)
  • Polymer light-emitting diodes placed in microcavities
  • 1996
  • Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 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.
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7.
  • Berggren, Magnus, et al. (författare)
  • Ultraviolet electroluminescence from an organic light emitting diode
  • 1995
  • Ingår i: Advanced Materials. - : Wiley-VCH Verlag Berlin. - 0935-9648 .- 1521-4095. ; 7:11, s. 900-903
  • Tidskriftsartikel (refereegranskat)abstract
    • The extension of the emission region for organic LEDs into the ultraviolet region is reported. Emission at 394 nm is achieved by modifying the geometry of a device based on poly(octylphenyl)bithiophene (PTOPT) and poly(octylphenyl)oxadiazole (PBD) which had previously been shown to emit white light. Through changing the geometry the red and green emission peaks have been suppressed and the UV band (from the PBD) enhanced.
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8.
  • Dyreklev, Peter, et al. (författare)
  • Polarized electroluminescence from an oriented substituted polythiophene in a light emitting diode
  • 1995
  • Ingår i: Advanced Materials. - : Wiley-VCH Verlag Berlin. - 0935-9648 .- 1521-4095. ; 7:1, s. 43-45
  • Tidskriftsartikel (refereegranskat)abstract
    • Polarized light sources based on stretch-oriented conjugated polymers are reported. The devices, based on poly 3(4-octylphenyl)-2,2′-bithiophene, show an external quantum efficiency of 0.1% and are produced using a very simple method which may be easily extended to other polymers. The fabrication of the devices is described and factors such as the emission and spectral differences parallel and prependicular to the stretching direction discussed.
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9.
  • Granlund, Thomas, et al. (författare)
  • A polythiophene microcavity laser
  • 1998
  • Ingår i: Chemical Physics Letters. - : Elsevier. - 0009-2614 .- 1873-4448. ; 288:5-6, s. 879-884
  • Tidskriftsartikel (refereegranskat)abstract
    • We report photopumped lasing in a microcavity device with a polythiophene layer as the emitter. These microcavity devices are built by joining two polymer coated dielectric 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(-1), and that the exciton concentration is 2 X 10(17) cm(-3) at the lasing transition, well below the exciton-exciton recombination level. (C) 1998 Elsevier Science B.V. All rights reserved.
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10.
  • Granlund, Thomas, et al. (författare)
  • Lasing in substituted polythiophene between dielectric mirrors
  • 1999
  • Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 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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