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Development and characterization of an efficient bio-white polymer light-emitting diode with red and green phosphorescent dyes as dopants

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Abstract

An efficient white polymer light-emitting diode (WPLED) with stable Commission Internationale de l’éclairage (CIE) coordinates is fabricated. A blue electroluminescence (EL)-emitting conducting polymer [poly(9,9-di-n-hexyl-fluorenyl-2,7-diyl)] is used as a host for red [Bis(1-phenyl-isoquinoline)(acetylacetonate)iridium(III)] and green [iridium(III)tris(2-(4-tolyl)pyridinato-N,C2)] phosphorescent dyes. Although efficient triplet energy transfer is not possible in the green phosphorescent dye, the self-trapping mechanism is utilized for the emission of EL in the green region while an efficient triplet exciton energy transfer from the host to the red dye is utilized for EL in the red wavelength region. Concentrations of the three constituents are optimized to obtain pure white light of appropriate CIE coordinates. An efficient electron-blocking layer based on a biomaterial (salmon-DNA) is also incorporated in the WPLED to improve the device performance. The WPLED shows three distinguished peaks for the primary colors and achieved a maximum luminance and luminous efficiency of 350 cd/m2 and 0.86 cd/A, respectively.

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Acknowledgements

Financial support from Department of Science and Technology (DST), Government of India is highly acknowledged. The authors also wish to thank Dr. Kamalasanan, NPL, New Delhi, for providing some facilities for measurements.

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Authors and Affiliations

  1. Department of Electronic Science, University of Delhi South Campus, Benito Juarez Road, New Delhi, 110021, India

    Devinder Madhwal, S. S. Rait, A. Kumar, A. Verma, P. K. Bhatnagar & P. C. Mathur

  2. Department of Electrical Engineering and Computer Science, University of Hyogo, Himeji, Japan

    K. Tada & M. Onoda

Authors
  1. Devinder Madhwal
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  2. S. S. Rait
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  3. A. Kumar
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  4. A. Verma
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  5. K. Tada
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  6. M. Onoda
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  7. P. K. Bhatnagar
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  8. P. C. Mathur
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Correspondence to Devinder Madhwal.

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Madhwal, D., Rait, S.S., Kumar, A. et al. Development and characterization of an efficient bio-white polymer light-emitting diode with red and green phosphorescent dyes as dopants. J Mater Sci 45, 3300–3303 (2010). https://doi.org/10.1007/s10853-010-4343-5

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  • DOI: https://doi.org/10.1007/s10853-010-4343-5

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