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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Display Technology

    Background:

    • Augmented reality (AR) requires high light conversion efficiency (LCE) in micro-LED quantum dot (QD) displays.
    • Existing QD displays face challenges with reabsorption loss and non-directional light emission.

    Purpose of the Study:

    • To present a structural integration scheme for micro-LED QD displays to overcome reabsorption and non-directional emission.
    • To enhance light conversion efficiency (LCE) and light extraction for AR applications.

    Main Methods:

    • Conducted comprehensive optical simulations.
    • Optimized quantum dot (QD) film thickness to mitigate reabsorption.
    • Integrated side reflective banks and a top distributed Bragg reflector (DBR).
    • Optimized micro-lenses on QD pixels for directional emission.

    Main Results:

    • Optimal QD film thickness reduced reabsorption losses.
    • Integrated reflective banks and DBR significantly improved LCE and light extraction.
    • Optimized micro-lenses achieved highly directional emission within a ±20° acceptance angle.
    • Achieved a substantial increase in ±20° LCE from 5.38% to 19.45%.

    Conclusions:

    • Combined structural engineering is crucial for high-performance AR-compatible micro-LED QD displays.
    • The proposed scheme effectively enhances LCE and directional emission.
    • This work provides a pathway for developing advanced displays for AR.