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Enhancing extraction efficiency of quantum dot light-emitting diodes by surface engineering.

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    Surface roughening of quantum dot light-emitting diode (QLED) substrates using wet chemical etching enhances light extraction. This method boosts external quantum efficiency (EQE) by scattering light and suppressing waveguide modes.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Nanotechnology

    Background:

    • Light extraction efficiency is critical for quantum dot light-emitting diode (QLED) performance.
    • Substrate surface modification is a key strategy to enhance light extraction.
    • Developing facile, low-cost, and scalable surface modification processes is essential.

    Purpose of the Study:

    • To investigate the effect of substrate surface roughening on QLED light extraction efficiency.
    • To explore a facile and scalable wet chemical etching method for substrate modification.
    • To analyze the impact of surface morphology on light scattering and waveguide modes.

    Main Methods:

    • Utilizing wet chemical etching to create a "multi-pits" surface morphology on the substrate.
    • Fabricating QLED devices with both roughened and smooth substrate surfaces for comparison.
    • Measuring and comparing the external quantum efficiency (EQE) of the fabricated QLEDs.

    Main Results:

    • The "multi-pits" surface acts as scattering centers, improving output light homogeneity.
    • Surface roughening suppresses optical waveguide modes, increasing output coupling efficiency.
    • QLEDs with roughened surfaces exhibited a maximum 12% increase in EQE and over a 2.2-fold increase at high driving voltage.

    Conclusions:

    • Wet chemical etching offers a scalable and cost-effective method for QLED substrate surface modification.
    • Substrate surface roughening significantly enhances light extraction efficiency and overall QLED performance.
    • The "multi-pits" structure effectively improves light scattering and reduces internal optical losses.