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    Area of Science:

    • Materials Science
    • Organic Electronics
    • Device Physics

    Background:

    • Single-layer organic light-emitting diodes (OLEDs) offer simplified fabrication but often suffer from lower efficiency compared to multi-layer devices.
    • Achieving balanced charge injection and recombination in single-layer OLEDs is crucial for high performance.

    Purpose of the Study:

    • To develop highly efficient single-layer OLEDs using a graded-composition architecture.
    • To investigate the role of material grading in optimizing charge carrier dynamics and device efficiency.

    Main Methods:

    • Fabrication of single-layer OLEDs with a graded-composition structure, transitioning from hole-transport to electron-transport materials.
    • Characterization of device performance, including turn-on voltage, power efficiency, and current efficiency.
    • Analysis of the impact of emission dopants on charge carrier balance and recombination zone location.

    Main Results:

    • The graded-composition single-layer OLEDs exhibited a low turn-on voltage of 2.85 V.
    • Maximum power efficiency reached 44.8 lm/W, and current efficiency reached 42.7 cd/A.
    • Emission dopants were found to be critical for balancing charge carriers, shifting the recombination zone towards the device center.

    Conclusions:

    • The graded-composition architecture is a viable strategy for creating highly efficient single-layer OLEDs.
    • Optimizing charge carrier balance through material grading significantly improves OLED performance.
    • This approach offers a promising pathway for simplified and efficient OLED fabrication.