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Surface Plasmon Coupling with Radiating Dipole for Enhancing the Emission Efficiency and Light Extraction of a Deep Ultraviolet Light Emitting Diode

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Abstract

In this paper, we numerically investigated the emission characteristics of surface plasmon (SP)-enhanced deep ultraviolet light emitting diode (DUV-LED) by employing Al/Al2O3 core-shell nanoparticle(NP) structure on the p-GaN contact layer by utilizing finite-difference time-domain (FDTD) method. The results suggest that normalized dipole power of TE (TM) polarization is enhanced (inhibited) in the DUV range by coupling with in-plane substrate localized surface plasmon (LSP) mode from Al/Al2O3 core-shell nanoparticle (NP). It is found that normalized upward extraction power for both polarizations can also be significantly increased by scattering effect when photons and excitons coupling with in-plane air LSP mode induced on the NP; thus, the light extraction efficiency (LEE) can be substantially enhanced. The depth d between quantum well (QW) and NP and NP size have a remarkable influence on LSP resonance wavelength. Through careful regulation of NP size and depth d, the emission characteristics in DUV range (240–280 nm) exhibit a considerable amelioration.

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Funding

This project was supported by Key Technology Research and Industrialization of GaN-Based Power Devices on 8-Inch Si Substrate for High-Frequency Switching Power Supply Applications of Guangdong Province, China (2019B010128002); Science and Technology Program Project for the Innovation of Forefront and Key Technology of Guangdong Province, China (2014B010119004, 2014B010121001); Institute of Science and Technology Collaborative Innovation Major Project of Guangzhou, China (201604010047); and Special Fund for Scientific and Technological Innovation and Development of Guangzhou – Foreign Science and Technology Cooperation Project, China (201807010083).

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Authors and Affiliations

  1. Institute of Semiconductor Science and Technology, South China Normal University, Guangzhou, 510631, China

    Yafeng Yang, Huiqing Sun, Yaohua Zhang, Ha Su, Xicheng Shi & Zhiyou Guo

  2. Guangdong Provincial Engineering Technology Research Center for Low Carbon and Advanced Energy Materials, Guangzhou, 510631, China

    Huiqing Sun & Zhiyou Guo

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  1. Yafeng Yang
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  2. Huiqing Sun
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  4. Ha Su
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Correspondence to Huiqing Sun.

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Yang, Y., Sun, H., Zhang, Y. et al. Surface Plasmon Coupling with Radiating Dipole for Enhancing the Emission Efficiency and Light Extraction of a Deep Ultraviolet Light Emitting Diode. Plasmonics 15, 881–887 (2020). https://doi.org/10.1007/s11468-019-01107-4

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