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Electronic Processes Associated with Electroluminescence in Conjugated Polymers

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Materials and Measurements in Molecular Electronics

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 81))

Abstract

Processible conjugated polymers can be used to fabricate a range of thin-film diodes which can be designed to show good characteristics both as electroluminescent diodes and also as photoconductive diodes. We consider the present understanding of the operation of light-emitting diodes which use conjugated polymers for both charge transport and emission. We highlight the improvement to the electroluminescence efficiency that can be produced by the use of two polymer layers selected so that the heterojunction between the two layers is able to confine charge and thus bring about electron-hole capture to generate excitons at this interface. We present results on the photophysical properties of the cyano-substituted poly(phenylene vinylene)s which provide electron transport layers in these heterostructure devices; we find evidence for strong interchain interactions (excimer formation) for the neutral excited states in these polymers, with strong red-shifts of the luminescence, though preserving high photoluminescence efficiencies.

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References

  1. H. Koezuka, A. Tsumara and T. Ando, Field-effect transistor with polythiophene thin film, Synthetic Metals, Vol. 18, (1987), pp. 699–704.

    Article  Google Scholar 

  2. A. Assadi, C. Svensson, M. Willander and O. Inganäs, Field-effect Mobility of Poly(3-hexyl thiophene), Appl. Phys. Lett., Vol. 53, (1988), pp. 195–197.

    Article  ADS  Google Scholar 

  3. J. Paloheimo, H. Stubb, P. Yli-Lahti and P. Kuivalainen, Field Effect Conduction in Polyalkylthiophenes, Synthetic Metals, Vol. 41–43, (1991), pp. 563–566.

    Article  Google Scholar 

  4. J. H. Burroughes, C. A. Jones and R. H. Friend, Polymer Diodes and Transistors: New Semiconductor Device Physics, Nature, Vol. 335, (1988), pp. 137–141.

    Article  ADS  Google Scholar 

  5. F. Gamier, G. Horovitz, X. Peng and D. Fichou, An all-organic “soft” thin film transistor with very high carrier mobility, Adv. Materials, Vol. 2, (1990), pp. 592–594.

    Article  Google Scholar 

  6. F. Gamier, R. Hajlaoui, A. Yassar and P. Srivastava, All-Polymer Field-Effect Transistor Realised by Printing Techniques, Science, Vol. 265, (1994), pp. 1684–1686.

    Article  ADS  Google Scholar 

  7. J. H. Burroughes, D. D. C. Bradley, A. R. Brown, R. N. Marks, K. Mackay, R. H. Friend, P. L. Burn and A. B. Holmes, Light-Emitting Diodes Based on Conjugated Polymers, Nature, Vol. 347, (1990), pp. 539–541.

    Article  ADS  Google Scholar 

  8. R. A. Wessling and R. G. Zimmerman,U.S. Patent,(1968), 3401152.

    Google Scholar 

  9. R. A. Wessling and R. G. Zimmerman, U.S. Patent,(1972), 3706677.

    Google Scholar 

  10. I. Murase, T. Ohnishi, T. Noguchi and M. Hirooka, Highly Conducting Poly(p-phenylene vinylene) Prepared From a Sulphonium Salt, Polymer Commun., Vol. 25, (1984), pp. 327–329

    Google Scholar 

  11. D. R. Gagnon, J. D. Capistran, F. E. Karasz and R. W. Lenz, Conductivity Anisotropy in Oriented Poly(p-phenylene vinylene), Polymer Bulletin, Vol. 12, (1984), pp. 293–298.

    Article  Google Scholar 

  12. P. L. Burn, D. D. C. Bradley, R. H. Friend, D. A. Halliday, A. B. Holmes, R. W. Jackson and A. M. Kraft, Precursor Route Chemistry and Electronic Properties of Poly(1,4phenylenevinylene), Poly(2,5-dimethyl-1,4-phenylenevinylene), and Poly(2,5-dimethoxy-1,4phenylenevinylene), J. Chem. Soc. Perkin Trans 1, (1992), pp. 3225–3231.

    Article  Google Scholar 

  13. F. Wudl, P. M. Allemand, G. Srdanov, Z. Ni and D. McBranch, Polymers and an Unusual Molecular Crystal with Nonlinear Optical Properties, in Materials for Nonlinear Optics: Chemical Perspectives S. R. Marder, J. E. Sohn, G. D. Stucky, Eds. (American Chemical Society, Washington, 1991 ), vol. 455, pp. 683–686.

    Google Scholar 

  14. D. Braun and A. J. Heeger, Visible light emission from semiconducting polymer diodes, Appl. Phys. Lett., Vol.58, (1991), pp. 1982–1984 erratum: (1991) 59, 878.

    Google Scholar 

  15. N. F. Colaneri, D. D. C. Bradley, R. H. Friend, P. L. Burn, A. B. Holmes and C. W. Spangler, Photoexcited States in Poly(p-phenylene vinylene): Comparison with trans,transdistyrylbenzene, a Model Oligomer, Phys. Rev. B, Vol. 42, (1990), pp. 11671–11681.

    Article  ADS  Google Scholar 

  16. N. C. Greenham, R. H. Friend and D. D. C. Bradley, Angular Dependence of the Emission From a Conjugated Polymer Light-Emitting Diode: Implications for Efficiency Calculations, Adv. Mater., Vol. 6, (1994), pp. 491–494.

    Article  Google Scholar 

  17. C. W. Tang and S. A. VanSlyke, Organic Electroluminescent Diodes, Appl. Phys. Lett., Vol. 51, (1987), pp. 913–915.

    Article  ADS  Google Scholar 

  18. C. W. Tang, S. A. VanSlyke and C. H. Chen, Electroluminescence of Doped Organic Thin Films, J. Appl. Phys., Vol. 65, (1989), pp. 3610–3616.

    Article  ADS  Google Scholar 

  19. C. Adachi, S. Tokito, T. Tsutsui and S. Saito, Organic Electroluminescent Device with a three-layer Structure, Jap. J. Appl. Phys., Vol. 27, (1988), pp. 713–715.

    Article  ADS  Google Scholar 

  20. C. Adachi, S. Tokito, T. Tsutsui and S. Saito, Electroluminescence in Organic Films with Three-Layer Structure, Jap. J. Appl. Phys., Vol. 27, (1988), pp. 269–271.

    Article  ADS  Google Scholar 

  21. C. Adachi, T. Tsutsui and S. Saito, Organic electroluminescent device having a hole conductor as an emitting layer, Appl. Phys. Lett., Vol. 55, (1989), pp. 1489–1491.

    Article  ADS  Google Scholar 

  22. C. Adachi, T. Tsutsui and S. Saito, Blue light-emitting organic electroluminescent devices, Appl. Phys. Lett., Vol. 56, (1990), pp. 799–801.

    Article  ADS  Google Scholar 

  23. C. Adachi, T. Tsutsui and S. Saito, Confinement of charge carriers and molecular excitons within 5-nm-thick emitter layer in organic electroluminescent devices with a double heterostructure, Appl. Phys. Lett., Vol. 57, (1990), pp. 531–533.

    Article  ADS  Google Scholar 

  24. P. L. Burn, A. B. Holmes, A. Kraft, D. D. C. Bradley, A. R. Brown, R. H. Friend and R. W. Gymer, Chemical Tuning of Electroluminescent Copolymers to Improve Emission Efficiencies and Allow Patterning, Nature, Vol. 356, (1992), pp. 47–49.

    Article  ADS  Google Scholar 

  25. A. R. Brown, J. H. Burroughes, N. Greenham, R. H. Friend, D. D. C. Bradley, P. L. Burn, A.Kraft and A. B. Holmes,Poly(p-phenylene vinylene) Light-Emitting Diodes. Enhanced Electroluminescence Efficiency Through Charge Carrier Confinement, Appl. Phys. Lett., Vol. 61, (1992), pp. 2793–2795.

    Article  ADS  Google Scholar 

  26. N. C. Greenham, S. C. Moratti, D. D. C. Bradley, R. H. Friend and A. B. Holmes, Efficient Polymer-Based Light-Emitting Diodes Based on Polymers with High Electron Affinities, Nature, Vol. 365, (1993), pp. 628–630.

    Article  ADS  Google Scholar 

  27. P. L. Burn, A. Kraft, D. R. Baigent, D. D. C. Bradley, A. R. Brown, R. H. Friend, R. W. Gymer, A. B. Holmes and R. W. Jackson, Chemical Tuning of the Electronic Properties of Poly(p-phenylenevinylene)-Based Copolymers, J. Am. Chem. Soc., Vol. 115, (1993), pp. 10117–10124.

    Article  Google Scholar 

  28. G. Grem, G. Leditzky, B. Ullrich and G. Leising, Realisation of a Blue Light Emitting Device Using Poly(para phenylene), Adv. Materials, Vol. 4, (1992), pp. 36–37.

    Article  Google Scholar 

  29. Y. Ohmori, M. Uchida, K. Muro and K. Yoshino, Blue Electroluminescent Diode Utilizing Poly(alkylfluorene), Jap. J. Appl. Phys. Part 2 Lett., Vol.30, (1991)

    Google Scholar 

  30. I. Sokolik, Z. Yang, F. E. Karsz and D. Morton, Blue-Light Electroluminescence From pPhenylene-Based Copolymers, J. Appl. Phys., Vol. 74, (1993), pp. 3584–3586.

    Article  ADS  Google Scholar 

  31. C. Zhang, H. von Seggern, K. Pakbaz, B. Kraabel, H. W. Schmidt and A. J. Heeger, Blue Electroluminescent Diodes Utilizing Blends of Poly(p-phenylene vinylene) in Poly(9carbazole), Synthetic Metals, Vol. 62, (1994), pp. 35–40.

    Article  Google Scholar 

  32. J. F. Grüner, R. H. Friend, U. Scherf, J. Huber and A. B. Holmes, A High Efficiency Blue Light-Emitting Diode Based on Novel Step-Ladder Poly(para-phenylene)s, Adv. Materials, Vol. 6, (1994), pp. 748–752.

    Article  Google Scholar 

  33. W. Tachelet, S. Jacobs, H. Ndayikengurukiye, H. J. Geise and J. Grüner, Blue Electroluminescent Devices With High Quantum Efficiency From Alkoxy-Substituted Poly(para-phenylene vinylene)-trimers in a Polystyrene Matrix, Appl. Phys. Lett., Vol. 64, (1994), pp. 2364–2366.

    Article  ADS  Google Scholar 

  34. A. R. Brown, N. C. Greenham, J. H. Burroughes, D. D. C. Bradley, R. H. Friend, P. L. Burn, A. Kraft and A. B. Holmes, Electroluminescence from Multilayer Conjugated Polymer Devices- Spatial Control of Exciton Formation and Emission, Chem. Phys. Lett., Vol. 200, (1992), pp. 46–54.

    Article  ADS  Google Scholar 

  35. R. N. Marks, D. D. C. Bradley, R. W. Jackson, P. L. Burn and A. B. Holmes, Charge Injection and Transport in Poly(p-phenylene vinylene) Light Emitting Diodes, Synthetic Metals, Vol. 55–57, (1993), pp. 4128–4133.

    Article  Google Scholar 

  36. S. Karg, W. Riess, V. Dyakanov and M. Schwoerer, Electrical and Optical Characterisation of Poly-phenylene-vinylene Light Emitting Diodes, Synthetic Metals,Vol.54, (1993), pp. 427433.

    Google Scholar 

  37. I. D. Parker, Carrier Injection and Device Characteristics in Polymer Light-Emitting Diodes, J. Appl. Phys., Vol. 75, (1994), pp. 1656–1666.

    Article  ADS  Google Scholar 

  38. P. Dannetun, M. Lögdlund, M. Fahlman, M. Boman, S. Stafström, W. R. Salaneck, R. Lazzaroni, C. Fredriksson, J. L. Brédas, S. Graham, R. H. Friend, A. B. Holmes, R. Zamboni and C. Taliani, The Chemical and Electronic Structure of the Interface Between Aluminium and Conjugated Polymers or Molecules Interfaces, Synthetic Metals, Vol. 55–57, (1993), pp. 212–217.

    Article  Google Scholar 

  39. P. Dannetun, M. Fahlman, C Fauquet, K. Kaerijama, Y. Sonoda, R. Lazzaroni, J. L. Brédas and W. R. Salaneck, Interface formation between calcium and poly(2,5 diheptyl-pphenylenevinylene): Implications for light emitting diodes, Synthetic Metals, Vol. 67, (1994), pp. 133–136.

    Article  Google Scholar 

  40. M. Fahlman, D. Beljonne, M. Lögdlund, A. B. Holmes, R. H. Friend, J. L. Brédas and W. R. Salaneck, Experimental and Theoretical Studies of the Electronic Structure of Na-Doped Poly(para phenylene vinylene), Chem. Phys. Lett., Vol. 214, (1993), pp. 327–332.

    Article  ADS  Google Scholar 

  41. F. Cacialli, R. H. Friend, S. C. Moratti and A. B. Holmes, Characterization of Properties of Polymeric Light Emitting Diodes over Extended Periods., Synthetic Metals, Vol. 67, (1994), pp. 157–160.

    Article  Google Scholar 

  42. S. Hayashi, H. Etoh and S. Saito, Electroluminescence of Perylene Films with a Conducting Polymer as an Anode, Jap. Journ. Appl. Phys., Vol. 25, (1986), pp. 773–775.

    Article  ADS  Google Scholar 

  43. T. Nakano, S. Doi, T. Noguchi, T. Ohnishi and Y. Iyechika, Organic Electroluminescence Device, European Patent Application,(1991) Application Number 91301416.

    Google Scholar 

  44. Y. Yang and A. J. Heeger, Polyaniline as a Transparent Electrode for Polymer Light-Emitting Diodes: Lower Operating Voltage and Higher Efficiency, Appl. Phys. Lett., Vol. 64, (1994), pp. 1245–1247.

    Article  ADS  Google Scholar 

  45. Q. Pei, G. Yu, C. Zhang, Y. Yang and A. J. Heeger, Polymer Light-Emitting Electrochemical Cells, Science, Vol. 269, (1995), pp. 1086–1089.

    Article  ADS  Google Scholar 

  46. S. Doi, T. Nakano, T. Noguchi and T. Ohnishi, Al-q/PPV Light-Emitting Diodes, Polymer Preprints, Jpn, Vol. 40, (1991), pp. 3594.

    Google Scholar 

  47. P. Burn, A. B. Holmes, A. Kraft, A. R. Brown, D. D. C. Bradley and R. H. Friend, Light emitting diodes based on conjugated polymers: Control of colour and efficiency, Mat. Res. Soc. Symp. Proc., Vol. 247, (1992), pp. 647–654.

    Article  Google Scholar 

  48. S. C. Moratti, D. D. C. Bradley, R. H. Friend, N. C. Greenham and A. B. Holmes, Molecularly Engineered Polymer LEDs, Mat. Res. Soc. Symp. Proc., Vol. 328, (1994), pp. 371–376.

    Article  Google Scholar 

  49. S. C. Moratti, D. D. C. Bradley, R. Cervini, R. H. Friend, N. C. Greenham and A. B. Holmes, Light-Emitting Polymer LEDs, SPIE proceedings series,Vol.2144, (1994), pp. 108114

    Google Scholar 

  50. J. L. Brédas and A. J. Heeger, Influence of Donor and Acceptor Substituents on the Electronic Characteristics of Poly(paraphenylene vinylene) and Poly(paraphenylene), Chem. Phys. Lett., Vol. 217, (1994), pp. 507–512.

    Article  ADS  Google Scholar 

  51. P. Bröms, M. Fahlman, K. Z. Xing, W. R. Salaneck, P. Dannetun, J. Cornil, D. A. dos Santos, J. L. Brédas, S. Moratti, A. B. Holmes and R. H. Friend, Optical Absorption Studies of Sodium Doped Poly(cyanoterephthalylidene), Synthetic Metals, Vol. 67, (1994), pp. 93–96.

    Article  Google Scholar 

  52. D. R. Baigent, N. C. Greenham, J. Grüner, R. N. Marks, R. H. Friend, S. C. Moratti and A. B. Holmes, Light-Emitting Diodes Fabricated With Conjugated Polymers–Recent Progress, Synthetic Metals, Vol. 67, (1994), pp. 3–10.

    Article  Google Scholar 

  53. B. R. Hsieh, H. Antoniadis, M. A. Abkowitz and M. Stolka, Charge Transport Properties of Poly(p-phenylene vinylene) and its Sulfonium Precursor Polymers at Different Degrees of Conversion, Polym. Preprints, Vol. 33, (1992), pp. 414.

    Google Scholar 

  54. N. C. Greenham, I. D. W. Samuel, G. R. Hayes, R. T. Phillips, Y. A. R. R. Kessener, S. C. Moratti, A. B. Holmes and R. H. Friend, Measurement of Absolute Photoluminescence Quantum Efficiencies in Conjugated Polymers, Chem. Phys. Lett., Vol. 241, (1995), pp. 8996

    Article  Google Scholar 

  55. R. N. Marks, J. J. M. Halls, D. D. C. Bradley, R. H. Friend and A. B. Holmes, The Photovoltaic Response in Poly(p-phenylene vinylene) Thin Film Devices, J. Phys. Condensed Matter, Vol. 6, (1994), pp. 1379–1394.

    Article  ADS  Google Scholar 

  56. I. D. W. Samuel, B. Crystall, G. Rumbles, P. L. Burn, A. B. Holmes and R. H. Friend, The Efficiency and Time-Dependence Of Luminescence From Poly(p-phenylene vinylene) and Derivatives, Chem. Phys. Lett., Vol. 213, (1993), pp. 472–478.

    Article  ADS  Google Scholar 

  57. L. S. Swanson, J. Shinar, A. R. Brown, D. D. C. Bradley, R. H. Friend, P. L. Burn, A. Kraft and A. B. Holmes, Electroluminescence detected magnetic resonance (ELMDR) study of poly(paraphenylene vinylene)-based diodes, Phys. Rev. B, Vol. 46, (1992), pp. 15072–15077.

    Article  ADS  Google Scholar 

  58. X. Wei, B. C. Hess, Z. V. Vardeny and F. Wudl, Studies of Photoexcited States in Polyacetylene and Poly(paraphenylenevinylene) by Absorption Detected Magnetic Resonance: the Case of Neutral Photoexcitations, Phys. Rev. Lett., Vol. 68, (1992), pp. 666–669.

    Article  ADS  Google Scholar 

  59. A. R. Brown, K. Pichler, N. C. Greenham, D. D. C. Bradley, R. H. Friend and A. B. Holmes, Optical Spectroscopy of Triplet Excitons and Charged Excitations in Poly(pphenylenevinylene) Light-Emitting Diodes, Chem. Phys. Lett., Vol. 210, (1993), pp. 61–66.

    Article  ADS  Google Scholar 

  60. L. Smilowitz, A. Hays, A. J. Heeger, G. Wang and J. E. Bowers, Time-Resolved Photoluminescence From Poly(2-methoxy, 5-(2’-ethyl-hexyloxy)-p-phenylene-vinylene): Solutions, gels, films, and blends, J. Chem. Phys., Vol. 98, (1993), pp. 6504–6509.

    Article  ADS  Google Scholar 

  61. Derivatives: The Effect of Intrinsic Persistence Length, J. Chem. Phys., Vol. 101, (1994), pp. 1673–1678.

    Article  Google Scholar 

  62. D. Braun, E. G. J. Staring, R. C. J. E. Demandt, G. L. J. Rikken, Y. A. R. R. Kessener and A. H. J. Venhuizen, Photoluminescence And Electroluminescence Efficiency In Poly(dialkoxyp-Phenylenevinylene), Synth. Met., Vol. 66, (1994), pp. 75–79.

    Article  Google Scholar 

  63. E. G. J. Staring, R. C. E. Demandt, D. Braun, G. L. J. Rikken, Y. A. R. R. Kessener, T. H. J. Venhuizen, H. Wynberg, W. ten Hoeve and K. J. Spoelstra, Photo-and Electroluminescence Efficiency in Soluble Poly(dialkoxy-p-phenylenevinylene), Adv. Mater., Vol. 6, (1994), pp. 934–937.

    Article  Google Scholar 

  64. J. W. P. Hsu, M. Yan, T. M. Jedju, L. J. Rothberg and B. R. Hsieh., Assignment Of The Picosecond Photoinduced Absorption In Phenylene Vinylene Polymers, Phys. Rev. B, Vol. 49, (1994), pp. 712–715.

    Article  ADS  Google Scholar 

  65. A. Köhler, J. Grüner, R. H. Friend, U. Scherf and K. Mullen, Photovoltaic Measurements on Aggregates in Ladder-Type Poly(phenylene), Chem. Phys. Lett., Vol.243, (1995), pp. 456-

    Google Scholar 

  66. U. Lemmer, S. Heun, R. F. Mahrt, U. Scherf, M. Hopmeier, U. Siegner, E. O. Göbel, K. Mullen and H. Bässler, Aggregate Fluorescence in Conjugated Polymers, Chem. Phys. Lett., Vol. 240, (1995), pp. 373–378.

    Article  ADS  Google Scholar 

  67. M. Yan, L. J. Rothberg, F. Papadimitrakopolous, M. E. Galvin and T. M. Miller, Spatially Indirect Excitons as Primary Photoexcitations in Conjugated Polymers, Phys. Rev. Lett., Vol. 72, (1994), pp. 1104–1107.

    Article  ADS  Google Scholar 

  68. M. Yan, L. J. Rothberg, F. Papadimitrakopoulos, M. E. Galvin and T. M. Miller, Defect Quenching of Conjugated Polymer Luminescence, Phys. Rev. Lett., Vol.73,(1994), pp. 744747

    Google Scholar 

  69. I. D. W. Samuel, G. Rumbles and C. J. Collison, Efficient Inter-chain Photoluminescence in a High Electron Conjugated Polymer, Phys. Rev., Vol. B52, (1995), pp. 11573–11572.

    Article  Google Scholar 

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Authors and Affiliations

  1. Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK

    D. R. Baigent & R. H. Friend

  2. Melville Laboratory for Polymer Synthesis, Pembroke Street, Cambridge, CB2 3RA, UK

    A. B. Holmes & S. C. Moratti

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Editors and Affiliations

  1. Electrotechnical Laboratory, University of Tsukuba, Tsukuba, Ibaraki, 305, Japan

    Koji Kajimura

  2. Electrotechnical Laboratory, Tsukuba, Ibaraki, 305, Japan

    Shin-ichi Kuroda

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© 1996 Springer-Verlag Tokyo

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Baigent, D.R., Friend, R.H., Holmes, A.B., Moratti, S.C. (1996). Electronic Processes Associated with Electroluminescence in Conjugated Polymers. In: Kajimura, K., Kuroda, Si. (eds) Materials and Measurements in Molecular Electronics. Springer Proceedings in Physics, vol 81. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68470-1_18

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