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Applied Physics Letters / Volume 93 / Issue 12 / ORGANIC ELECTRONICS AND PHOTONICS
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Appl. Phys. Lett. 93, 123311 (2008); http://dx.doi.org/10.1063/1.2990046 (3 pages)

Spectral effects of gain saturation in the β-phase of poly(9,9-dioctylfluorene)

M. Anni and M. Alemanno

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

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(Received 24 June 2008; accepted 5 September 2008; published online 25 September 2008)

We investigated the amplified spontaneous emission (ASE) properties of the β-phase of poly(9,9-dioctylfluorene) at T = 5 K. We observe ASE at about 478 nm with a threshold as low as 50 μJ cm−2. For excitation density higher than 350 μJ cm−2 a clear spectral rebroadening and a progressive ASE intensity saturation, ascribed to gain saturation, are observed. The gain saturation at 478 nm leads to ASE from the 470 nm vibronic band, with a threshold of about 3.0 mJ cm−2. We show that these effects are due to the break down, at high excitation density, of the four level amplifier scheme, typically applied to conjugated polymer films.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

conducting polymers, polymer films, spectral line broadening, superradiance, vibronic states

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2990046

PUBLICATION DATA

ISSN

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

Publisher

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

  1. F. Hide, M. A. Diaz Garcia, B. J. Schwartz, M. R. Andersson, Q. B. Pei, and A. J. Heeger, Science 273, 1833 (1996).
  2. N. Tessler, G. J. Denton, and R. H. Friend, Nature (London) 382, 695 (1996).
  3. I. D. W. Samuel and G. A. Turnbull, Chem. Rev. (Washington, D.C.) 107, 1272 (2007). [MEDLINE]
  4. T. Kobayashi, M. Flämmich, G. Jordan, R. D'Arcy, M. Rüther, W. J. Blau, Y. Suzuki, and T. Kaino, Appl. Phys. Lett. 89, 131119 (2006)APPLAB000089000013131119000001.
  5. G. Heliotis, R. Xia, G. A. Turnbull, A. Piers, W. L. Barnes, I. D. W. Samuel, and D. D. C. Bradley, Adv. Funct. Mater. 14, 91 (2004)
    and references therein.
  6. M. J. Winokur, J. Slinker, and D. L. Huber, Phys. Rev. B 67, 184106 (2003).
  7. M. Ariu, M. Sims, M. D. Rahn, J. Hill, A. M. Fox, D. G. Lidzey, M. Oda, J. Cabanillas-Gonzalez, and D. D. C. Bradley, Phys. Rev. B 67, 195333 (2003).
  8. M. Anni, M. E. Caruso, S. Lattante, and R. Cingolani, J. Chem. Phys. 124, 134707 (2006)JCPSA6000124000013134707000001. [MEDLINE]
  9. M. Anni, M. E. Caruso, and S. Lattante, J. Phys. Chem. C 112, 2958 (2008).
  10. M. E. Caruso and M. Anni, Phys. Rev. B 76, 054207 (2007).
  11. M. Anni, Appl. Phys. Lett. 93, 023308 (2008)APPLAB000093000002023308000001.
  12. G. Ryu, R. Xia, and D. D. C. Bradley, J. Phys.: Condens. Matter 19, 056205 (2007).
  13. T. Takahashi, S. Matsuo, H. Misawa, T. Karatsu, A. Kitamura, K. Kamada, and K. Ohta, Thin Solid Films 331, 298 (1998). [ISI]
  14. T. Virgili, G. Cerullo, L. Lüer, G. Lanzani, C. Gadermaier, and D. D. Bradley, Phys. Rev. Lett. 90, 247402 (2003). [ISI] [MEDLINE]
  15. C. Gadermaier, G. Cerullo, G. Sansone, G. Leising, U. Scherf, and G. Lanzani, Phys. Rev. Lett. 89, 117402 (2002). [ISI] [MEDLINE]
  16. We observe that our experiment is performed in quasisteady state regime, as the pump laser time width (3 ns) is much longer of both the spontaneous emission lifetime of PF8 [about 400 ps (Ref. 7)] and of the typical ASE decay times [on the scale of a few picoseconds (Ref. 22)].
  17. O. Svelto, S. Taccheo, and C. Svelto, Opt. Commun. 149, 277 (1998).
  18. T. Liu, K. Obennann, K. Petermann, F. Girardin, and G. Guekos, Electron. Lett. 33, 2042 (1997)ELLEAK000033000024002042000001. [ISI]
  19. E. C. Harvey, C. J. Hooker, M. H. Key, A. K. Kidd, J. M. D. Lister, M. J. Shaw, and W. T. Lelandd, J. Appl. Phys. 70, 5238 (1991)JAPIAU000070000010005238000001. [ISI]
  20. J. -P. R. Wells, D. G. Lidzey, P. J. Phillips, D. A. Carder, and A. Mark Fox, Appl. Phys. Lett. 85, 3080 (2004)APPLAB000085000015003080000001. [ISI]
  21. M. Roth, A. Hardy, and S. Ruschin, IEEE J. Quantum Electron. 37, 189 (2001).
  22. C. Kallinger, S. Riechel, O. Holderer, U. Lemmer, J. Feldmann, S. Berleb, A. G. Mückl, and W. Brütting, J. Appl. Phys. 91, 6367 (2002)JAPIAU000091000010006367000001. [ISI]
  23. T. Virgili, D. Marinotto, C. Manzoni, G. Cerullo, and G. Lanzani, Phys. Rev. Lett. 94, 117402 (2005). [MEDLINE]

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Figures (click on thumbnails to view enlargements)

FIG.1
PL spectra as a function of the excitation density.The dotted vertical lines indicate the low excitation density peak wavelength of the three main transitions. Inset: Absorbance spectrum at T = 300 K.

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

FIG.2
PL spectra in the 0–1 spectral region as a function of the excitation density. The spectra are normalized to 1 for clarity. Inset: FWHM of the 0–0 line and the two main 0–1 lines as a function of the excitation density. The rebroadening of the 478 nm ASE band is clearly visible.

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

FIG.3
Excitation density dependence of the emission intensity at 470 and 478 nm. The gray lines are the best fit curves not including gain saturation effects, while the dotted dark lines are the fit curves including gain saturation. Inset: Energy level scheme of PF8 including the pumping (black arrow), nonradiative vibrational relaxation (dotted arrows), and radiative relaxation due to both spontaneous and stimulated emission (dashed arrows).

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



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