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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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Integration of a Rib Waveguide Distributed Feedback Structure into a Light-Emitting Polymer Field-Effect Transistor

Cited 49 times inthomson ciCited 38 times inthomson ci
Title
Integration of a Rib Waveguide Distributed Feedback Structure into a Light-Emitting Polymer Field-Effect Transistor
Author
Gwinner, Michael C.Khodabakhsh, SagharSong, Myoung HoonSchweizer, HeinzGiessen, HaroldSirringhaus, Henning
Keywords
Absorption loss; Ambipolar; Charge recombinations; Dielectric thickness; Distributed feedback structure; Electrically pumped; Emitted light; Gate electrode materials; Lasing threshold; Light emitting polymer; Low loss; Metal electrodes; Mode simulation; Organic field-effect transistors; Organic laser; Recombination zones; Reference devices; Resonant mode; Rib waveguides; Tantalum pentoxide; Two-dimension
Issue Date
2009-05
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v.19, no.9, pp.1360 - 1370
Abstract
Ambipolar light-emitting organic field-effect transistors (LEFETs) possess the ability to efficiently emit light due to charge recombination in the channel. Since the emission can be made to occur far from the metal electrodes, the LEFET structure has been proposed as a potential architecture for electrically pumped organic lasers. Here, a rib waveguide distributed feedback structure consisting of tantalum pentoxide (Ta2O5) integrated within the channel of a top gate/bottom contact LEFET based on poly(9,9-dioctylfluorene-altbenzothiadiazole) (F8BT) is demonstrated. The emitted light is coupled efficiently into the resonant mode of the DFB waveguide when the recombination zone of the LEFET is placed directly above the waveguide ridge. This architecture provides strong mode confinement in two dimensions. Mode simulations are used to optimize the dielectric thickness and gate electrode material. It is shown that electrode absorption losses within the device can be eliminated and that the lasing threshold for optical pumping of the LEFET structure with all electrodes (4.5 μJ cm-2) is as low as that of reference devices without electrodes. These results enable quantitative judgement of the prospects for realizing an electrically pumped organic laser based on ambipolar LEFETs. The proposed device provides a powerful, lowloss architecture for integrating high-performance ambipolar organic semiconductor materials into electrically pumped lasing structures.
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DOI
10.1002/adfm.200801897
ISSN
1616-301X
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