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Related Experiment Video

Updated: Apr 12, 2026

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
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Further enhancement of light extraction efficiency from light emitting diode using triangular surface grating and

R Ghosh, A Haldar, K K Ghosh

    Applied Optics
    |May 14, 2015
    PubMed
    Summary

    Surface patterning of indium-zinc-oxide films enhances light extraction efficiency in near-infrared light-emitting diodes (LEDs). Optimized structures and an interlayer further boost light output, validated by simulations and fabrication.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Nanotechnology

    Background:

    • Light-emitting diodes (LEDs) are crucial optoelectronic devices.
    • Improving light extraction efficiency (LEE) is key for LED performance.
    • Indium-zinc-oxide films offer potential for LED applications.

    Purpose of the Study:

    • To enhance forward directional light extraction efficiency of LEDs.
    • To investigate surface patterning effects on indium-zinc-oxide films.
    • To optimize structures for near-infrared (NIR) LED applications.

    Main Methods:

    • Sol-gel technique for indium-zinc-oxide film development.
    • Finite-difference time-domain (FDTD) simulations using MEEP software.
    • Soft lithography for fabricating optimized surface patterns.

    Main Results:

    • Surface patterning of one-dimensional profiles improved LED light extraction.
    • The optimized patterned film is suitable for near-infrared LEDs.
    • Maximum enhancement observed around 1.040 μm wavelength.

    Conclusions:

    • Surface patterning is an effective strategy to enhance LED light extraction.
    • Further improvements are achievable with an interlayer in the top contact layer.
    • The study provides insights into light coupling in structured/multilayered surfaces.