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Highly Efficient Inverted Circularly Polarized Organic Light-Emitting Diodes

  • Li Wan
    Li Wan
    Department of Physics and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
    More by Li Wan
  • Jessica Wade
    Jessica Wade
    Department of Physics and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
    Department of Chemistry and Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K.
    More by Jessica Wade
  • Xingyuan Shi
    Xingyuan Shi
    Department of Physics and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
    Department of Chemistry and Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K.
    More by Xingyuan Shi
  • Shengda Xu
    Shengda Xu
    Department of Materials and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
    More by Shengda Xu
  • Matthew J. Fuchter*
    Matthew J. Fuchter
    Department of Chemistry and Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K.
    *Email: [email protected]
  • , and 
  • Alasdair J. Campbell*
    Alasdair J. Campbell
    Department of Physics and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
    *Email: [email protected]
Cite this: ACS Appl. Mater. Interfaces 2020, 12, 35, 39471–39478
Publication Date (Web):August 5, 2020
https://doi.org/10.1021/acsami.0c09139
Copyright © 2020 American Chemical Society

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    Abstract

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    Circularly polarized (CP) electroluminescence has been demonstrated as a strategy to improve the performance of organic light-emitting diode (OLED) displays. CP emission can be generated from both small-molecule and polymer OLEDs (SM-OLEDs and PLEDs), but to date, these devices suffer from low dissymmetry factors (g-factor < 0.1), poor device performance, or a combination of the two. Here, we demonstrate the first CP-PLED employing an inverted device architecture. Through this approach, we demonstrate a highly efficient CP-PLED, with a current efficiency of 16.4 cd/A, a power efficiency of 16.6 lm/W, a maximum luminance of over 28,500 cd/m2, and a high EL dissymmetry (gEL) of 0.57. We find that the handedness of the emitted light is sensitive to the PLED device architecture: the sign of CP-EL from an identically prepared active layer reverses between inverted and conventional devices. The inverted structure affords the first demonstration of CP-PLEDs exhibiting both high efficiency and high dissymmetry—the two figures of merit which, until now, have been difficult to achieve at the same time. We also highlight device architecture and associated internal electric field to be a previously unexplored means to control the handedness of CP emission. Our findings significantly broaden the versatility of CP emissive devices and should enable their further application in a variety of other CP-dependent technologies.

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