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Applied Physics Letters / Volume 93 / Issue 2 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 93, 023308 (2008); http://dx.doi.org/10.1063/1.2957669 (3 pages)

The role of the β-phase content on the stimulated emission of poly(9,9-dioctylfluorene) thin films

M. Anni

Dipartimento di Ingegneria dell’Innovazione, Università del Salento, Via per Arnesano 73100 Lecce, Italy

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(Received 19 May 2008; accepted 22 June 2008; published online 18 July 2008)

We investigated the optical gain properties of poly(9,9-dioctylfluorene) thin films as a function of the β-phase content. We demonstrate that the product between the gain cross section and the excited state lifetime of the β-phase is about 3.2 times larger than the glassy-phase one, indicating that the β-phase molecules, for a given pump density, have higher gain than the glassy-phase ones. The dependence of the amplified spontaneous emission threshold on the molecular properties, on the waveguide losses, and on the β-phase content is also quantitatively discussed.

© 2008 American Institute of Physics

ERRATUM

  1. Erratum: “The role of the beta-phase content on the stimulated emission of poly(9,9-dioctylfluorene) thin films” [Appl. Phys. Lett. 93, 023308 (2008)]
    M. Anni
    Appl. Phys. Lett. 93, 209902 (2008)APPLAB000093000020209902000001

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KEYWORDS and PACS

Keywords

conducting polymers, excited states, polymer films, stimulated emission, superradiance

PACS

  • 78.45.+h

    Stimulated emission

  • 78.66.Qn

    Polymers; organic compounds

  • 71.10.Li

    Excited states and pairing interactions in model systems

  • 61.41.+e

    Polymers, elastomers, and plastics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2957669

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (4) Tables (1)

Figures (click on thumbnails to view enlargements)

FIG.1
PL spectra as a function of the excitation density (in mJ cm−2) of the glassy-phase film (a) and β3 (β-phase content of 6.4%). Inset: Absorption spectra of the investigated samples (normalized to the peak value and scaled for clarity).

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Full width at half maximum of the 0-1 line as a function of the excitation density for all the investigated samples. Inset: ASE threshold as a function of the β-phase content in the films.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
Waveguide losses, net gain, and gain as a function of the β-phase content.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
β/glassy-phase relative ASE threshold as a function of the relative waveguide losses αβ/αg and of the β-phase content of the film. The thickest line is the line of equal ASE threshold of glassy and β-phase samples.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

Tables

Table I. β-phase content, ASE threshold, waveguide losses, net gain, and gain of the investigated samples (at a pump density of 4.0 mJ cm−1)

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