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Related Experiment Video

Updated: Mar 28, 2026

Development of Efficient OLEDs from Solution Deposition
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Luminance uniformity study of OLED lighting panels depending on OLED device structures.

Hyeong Woo Bae, Young Hoon Son, Byoung Yeop Kang

    Optics Express
    |December 25, 2015
    PubMed
    Summary

    The 3-tandem organic light-emitting diode (OLED) structure significantly improves luminance uniformity in OLED lighting panels. This advancement is crucial for achieving consistent light output and enabling larger panel designs without compromising quality.

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    Area of Science:

    • Materials Science
    • Electrical Engineering
    • Optoelectronics

    Background:

    • OLED lighting panels offer energy-efficient illumination but can suffer from luminance non-uniformity.
    • Device structure significantly impacts the electrical and optical performance of OLEDs.
    • Achieving uniform luminance is critical for high-quality lighting applications.

    Purpose of the Study:

    • To investigate and compare the luminance uniformity of OLED lighting panels with different device structures: single emission layer (single-EML), 2-tandem, and 3-tandem.
    • To evaluate the relationship between OLED device structure, electrical characteristics, and luminance distribution.
    • To determine the feasibility of larger OLED panel sizes with improved uniformity.

    Main Methods:

    • Circuit simulation of OLED device structures.

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    Last Updated: Mar 28, 2026

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  • Fabrication and measurement of OLED lighting panels.
  • Analysis of luminance distribution and non-uniformity using quantitative metrics.

    • Main Results:

    • The 3-tandem OLED structure demonstrated the lowest luminance non-uniformity (1.34% in simulation, 4.1% in measurement) at approximately 1,000 cd/m2.
    • Luminance non-uniformity is directly related to OLED conductance, highlighting the importance of high luminance-current efficiency.
    • Simulations indicate that 3-tandem panels can be scaled up to 5,000 mm2 with less than 10% non-uniformity without auxiliary electrodes.

    Conclusions:

    • The 3-tandem OLED device structure is superior for achieving high luminance uniformity in lighting panels.
    • Optimizing OLED conductance and efficiency is key to minimizing non-uniformity.
    • The 3-tandem structure enables the development of larger, uniform OLED lighting solutions.