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Enhancing light conversion efficiency of YAG:Ce phosphor substrate using nanoimprinted functional structures
Daihong Huh1, Wonjoong Kim1, Kwan Kim1
1Department of Materials Science and Engineering, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 136-713, Republic of Korea.
Nanotechnology
|January 1, 2020
Summary
Researchers enhanced white light production by improving phosphor substrate efficiency. A micro-cone pattern increased light extraction by 33.2%, boosting performance for LED applications.
Area of Science:
- Materials Science
- Optoelectronics
- Photonics
Background:
- Phosphor substrates are crucial for generating white light in LEDs by converting blue light to green.
- Enhancing light extraction efficiency is key to improving LED performance and energy savings.
- Yttrium Aluminum Garnet doped with Cerium (YAG:Ce) is a common phosphor material.
Purpose of the Study:
- To enhance the light extraction efficiency of YAG:Ce phosphor substrates.
- To investigate the effect of surface patterning on phosphor performance.
- To demonstrate a simple and effective method for improving LED light output.
Main Methods:
- Fabrication of surface patterns on YAG:Ce phosphor substrates using a spin-on-glass imprint process.
- Creation of both nano- and micro-scale patterns to evaluate size-dependent performance.
- Measurement and comparison of light extraction efficiency between patterned and flat substrates.
Main Results:
- Successful fabrication of micro-cone patterns on the YAG:Ce phosphor substrate surface.
- A significant increase in light extraction efficiency was observed with patterned substrates.
- The micro-cone patterned substrate showed a 33.2% enhancement in light extraction efficiency compared to the flat substrate.
Conclusions:
- Surface imprinting with micro-cone structures is an effective method to enhance YAG:Ce phosphor light extraction.
- This technique offers a simple and scalable approach for improving LED efficiency.
- The findings contribute to the development of more efficient solid-state lighting technologies.
