All-dielectric nanostructures for high-efficient angular emission from polarized LEDs

Miao Wang; Juemin Yi; Yumin Zhang; Bing Cao; Chinhua Wang; Jianfeng Wang; Ke Xu

doi:10.1117/12.2602690

9 October 2021 All-dielectric nanostructures for high-efficient angular emission from polarized LEDs

Miao Wang, Juemin Yi, Yumin Zhang, Bing Cao, Chinhua Wang, Jianfeng Wang, Ke Xu

Proceedings Volume 11894, Optoelectronic Devices and Integration X; 1189417 (2021) https://doi.org/10.1117/12.2602690
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

Gallium nitride (GaN) -based light-emitting diodes (LEDs) have been widely used in lighting, display, communication and other fields due to their high brightness, high luminous efficiency and low power consumption. Polarized LEDs have important potential application in flat panel display, holographic display and imaging fields. It’s very important to study how to realize efficient polarized LEDs. Realizing directional radiation (collimation) is one of the effective methods to improve the utilization efficiency of polarized light. In this paper, we proposed an all-dielectric (Al2O3/SiO2) films/(TiO2) grating nanostructures, and found that the enhanced emission of the polarized LED can be controlled within a specific angle by optimizing the parameters of the all-dielectric nanostructures. In particular, the simulation results show that the angular emission of polarized blue LEDs can be controlled within 11°, and the light output efficiency is more than 60% when the nanostructure is set as: Al2O3/SiO2 film thickness 70 nm, grating period 500 nm, line width 180 nm, and depth 100 nm. The peak light intensity is 5.2 times that of the bare LED. This nanostructure can be prepared easily and it has a large process tolerance. Our findings will provide the feasibility for achieving efficient polarized LEDs in display technology and imaging fields.

Citation Download Citation

Miao Wang, Juemin Yi, Yumin Zhang, Bing Cao, Chinhua Wang, Jianfeng Wang, and Ke Xu "All-dielectric nanostructures for high-efficient angular emission from polarized LEDs", Proc. SPIE 11894, Optoelectronic Devices and Integration X, 1189417 (9 October 2021); https://doi.org/10.1117/12.2602690

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