Introduction to Micro-LED Technology
Micro-LED technology, composed of micrometer-scale LED pixels, is a next-generation display technology that offers self-emission, high resolution, high brightness, high efficiency, high contrast, low power consumption, high stability, and long lifespan. It is widely regarded as a revolutionary display technology. By controlling optical characteristics such as divergence angle, emission direction, and polarization of Micro-LEDs, this technology has significant applications in areas such as 3D Micro-LED displays and augmented reality (AR).
Collaborative Research at Central South University
A research team from Central South University, led by Wang Liancheng, in collaboration with the Institute of Semiconductors, Chinese Academy of Sciences, and Hunan University, has been focusing on the integration of metasurface light field control in Micro-LED devices in recent years.
Recent Breakthroughs in Micro-LED Technology
From November 19-21, their latest findings were presented at the 10th International Forum on Wide Bandgap Semiconductors (IFWS 2024) held in Suzhou. The key achievements include:
- First Vertical Structure F-P Resonant Cavity Mini/Micro-LED Devices:
By using techniques like bonding and CMP, the team successfully developed vertical structure F-P resonant cavity Mini/Micro-LEDs. This innovation reduced the spectral full-width at half-maximum (FWHM) from the conventional 24nm to 15nm, and improved emission directionality by 16.4% (as reported in Applied Physics Letters 121.20 (2022)). - On-site Integration of Subwavelength Metal Gratings for Linearly Polarized Micro-LEDs:
The team reported the development of linearly polarized Micro-LEDs through the integration of subwavelength metal gratings. These devices achieved a TM/TE ratio of 6.2 and an extinction ratio of 14 dB. Further improvements in polarization ratio were achieved through deposition of dielectric films and mirror sidewall engineering (referenced in Applied Physics Letters 122.11 (2023) and Applied Physics Letters 124.11 (2024)). - Circularly Polarized Micro-LEDs with High Efficiency:
The team introduced circularly polarized Micro-LEDs, which demonstrated a cross-polarization reflectivity exceeding 80%, with an extinction ratio above 38 dB (as published in Optics Letters 46.11 (2021)). - Directed Emission Micro-LEDs for Wide-Angle Output:
They also reported the first directed emission Micro-LEDs, which enable high-efficiency, wide-angle light emission and the ability to emit light at arbitrary angles or in dual-angle directed emission modes (published in Optics Letters 46.14 (2021)).





These innovations mark significant advancements in the polarization and resonant cavity control of Micro-LEDs, with broad implications for future applications in displays and AR technologies.
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