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Published on: November 21, 2019
Surface-plasmon-enhanced GaN-LED based on a multilayered M-shaped nano-grating
Haosu Zhang1, Jun Zhu, Zhendong Zhu
1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China.
Optics Express
|June 6, 2013
Summary
Researchers developed an M-shaped nano-grating for gallium nitride LEDs, significantly boosting light output. This cost-effective nano-imprint lithography method enhances internal quantum efficiency and light extraction efficiency.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Gallium nitride (GaN)-based light-emitting diodes (LEDs) are crucial for modern lighting and displays.
- Enhancing light extraction efficiency (LEE) and internal quantum efficiency (IQE) in GaN LEDs remains a key challenge.
- Surface-plasmon (SP) coupling offers a potential pathway to improve LED performance.
Purpose of the Study:
- To propose and investigate a novel multilayered metallic M-shaped nano-grating structure for GaN LEDs.
- To enhance the internal quantum efficiency, light extraction efficiency, and surface-plasmon extraction efficiency.
- To explore the properties of the surface-plasmon mode and the Purcell effect in the proposed LED structure.
Main Methods:
- Fabrication of the M-shaped nano-grating using low-cost nano-imprint lithography.
- Design of a quasi-symmetrical-waveguide structure for the grating.
- Investigation of the optical properties, including transmission in the visible region.
- Characterization of surface-plasmon modes and the Purcell effect.
- Experimental measurement of photoluminescence intensity.
Main Results:
- The proposed M-shaped nano-grating structure demonstrates high transmission in the visible region.
- The study successfully investigated the surface-plasmon mode and Purcell effect in the LED.
- Experimental results show a peak photoluminescence intensity over 10 times greater than that of a naked GaN-LED.
Conclusions:
- The multilayered metallic M-shaped nano-grating is an effective structure for enhancing GaN LED performance.
- Low-cost nano-imprint lithography enables the fabrication of these high-performance nanostructures.
- The proposed structure offers a significant improvement in light output for GaN-based LEDs.
