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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
Light extraction from organic light-emitting diodes for lighting applications by sand-blasting substrates
1Center for Display Research, Department of Electronic & Computer Engineering, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong.
Optics Express
|February 23, 2010
Summary
Sand-blasting organic light-emitting diode (OLED) substrates improves light extraction efficiency by 20%. This cost-effective method enhances color uniformity and light distribution, making it suitable for large-area lighting applications.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Lighting
Background:
- Organic light-emitting diodes (OLEDs) are promising for large-area lighting.
- Efficient light extraction is crucial for OLED performance.
- Current methods for light extraction can be complex or costly.
Purpose of the Study:
- To develop a simple and cost-effective method for improving light extraction in OLEDs.
- To enhance the efficiency and light distribution of large-area OLED lighting.
- To investigate the impact of substrate texturing on OLED performance.
Main Methods:
- Sand-blasting the edges and back-side surface of glass substrates used in OLEDs.
- Characterizing the optical properties and light extraction efficiency of the modified substrates.
- Evaluating color uniformity and light distribution patterns.
Main Results:
- Achieved a 20% improvement in forward light extraction efficiency.
- Demonstrated constant color over all viewing angles.
- Obtained a uniform Lambertian light distribution pattern.
Conclusions:
- Sand-blasting offers a simple, cost-effective solution for enhancing OLED light extraction.
- This method is suitable for mass production of large-area OLED lighting.
- Improved light scattering leads to better visual quality and efficiency.
