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Effect of the polymer emission on the electroluminescence characteristics of n-ZnO nanorods/p-polymer hybrid light emitting diode

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Abstract

Hybrid light emitting diodes (LEDs) based on zinc oxide (ZnO) nanorods and polymers (single and blended) were fabricated and characterized. The ZnO nanorods were grown by the chemical bath deposition method at 50°C. Three different LEDs, with blue emitting, orange-red emitting or their blended polymer together with ZnO nanorods, were fabricated and studied. The current–voltage characteristics show good diode behavior with an ideality factor in the range of 2.1 to 2.27 for all three devices. The electroluminescence spectrum (EL) of the blended device has an emission range from 450 nm to 750 nm, due to the intermixing of the blue emission generated by poly(9,9-dioctylfluorene) denoted as PFO with orange-red emission produced by poly(2-methoxy-5(20-ethyl-hexyloxy)-1,4-phenylenevinylene) 1,4-phenylenevinylene) symbolized as MEH PPV combined with the deep-band emission (DBE) of the ZnO nanorods, i.e. it covers the whole visible region and is manifested as white light. The CIE color coordinates showed bluish, orange-red and white emission from the PFO, MEH PPV and blended LEDs with ZnO nanorods, respectively. These results indicate that the choice of the polymer with proper concentration is critical to the emitted color in ZnO nanorods/p-organic polymer LEDs and careful design should be considered to obtain intrinsic white light sources.

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Authors and Affiliations

  1. Department of Science and Technology, Linköping University, 601 74, Norrköping, Sweden

    S. Zaman, A. Zainelabdin, G. Amin, O. Nur & M. Willander

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  1. S. Zaman
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  2. A. Zainelabdin
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  3. G. Amin
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  4. O. Nur
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  5. M. Willander
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Correspondence to S. Zaman.

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Zaman, S., Zainelabdin, A., Amin, G. et al. Effect of the polymer emission on the electroluminescence characteristics of n-ZnO nanorods/p-polymer hybrid light emitting diode. Appl. Phys. A 104, 1203–1209 (2011). https://doi.org/10.1007/s00339-011-6411-3

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  • DOI: https://doi.org/10.1007/s00339-011-6411-3

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