Xuzheng Wang, Zhenhuan Tian, Shuheng Pei, Chuangcheng Xu, Qinyue Sun, Jiadong Zhang, Jieming Wei, Feng Li, Feng Yun
Keywords: Linearly Polarized Micro-LED, Luminous Efficiency, Polarization Extinction Ratio, Meta-Grating, Energy Recycling
DOI: https://doi.org/10.1021/acs.nanolett.4c04914
Abstract
Linearly polarized micro light-emitting diodes (LP-Micro-LEDs) exhibit exceptional potential across diverse fields. The existing methods to introduce polarization to initially unpolarized Micro-LEDs and to further enhance the degree of polarization are, however, at the expense of low luminous efficiency. We fabricated a GaN-based blue Micro-LED integrated with an Al nanograting and a specially designed Ag/GaN meta-grating, which overcomes the dilemma between the luminous efficiency and polarization degree by simultaneously introducing the effects of mode selection and energy recycling. The fabricated LP-Micro-LED achieves an average polarization extinction ratio (ER) of 21.92 dB within ±60°, showing a 2.04-fold increase in efficiency and a 1.32-fold increase in ER compared to the Ag reflector design. This approach opens the way toward the next generation of high-efficiency and low-cost optoelectronic devices in encryption, displays, optical communication, and medicine.

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