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Efficiency enhancement of micro-light-emitting diode with shrinking size by localized surface plasmons coupling

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Abstract

The external quantum efficiency (EQE) enhancement of different sized GaN micro-light-emitting diodes (μLEDs) by using localized surface plasmons (LSPs) have been studied. Silver nanoparticles (Ag NPs) are attached to the sidewalls of μLEDs by spin-coating so as to be effectively coupled with the multiple quantum well (MQW) of μLEDs and generate the LSPs. In the μLEDs with 20 × 20 μm2 large mesas, the LSPs can effectively inhibit the efficiency droop. Compared to the μLED samples without the LSPs coupling, the EQE has been enhanced by about 8% at a high current density of 20,000 A/cm2. This work confirms the effectiveness of the LSPs technology in improving the μLED performances, which is originally practiced only on the basal faces of conventional LEDs.

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Acknowledgements

We acknowledge the support from National Key Research and Development Program of China (Nos. 2023YFB3608703 and 2023YFB3608700), Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China (Nos. 2021ZZ122 and 2020ZZ110), and Fujian provincial projects (Nos. 2021HZ0114 and 2021J01583).

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Authors and Affiliations

  1. School of Physics and Electronic Information, Weifang University, Weifang, 261061, China

    Zaifa Du & Kai Han

  2. Key Laboratory of Optoelectronics Technology, Beijing University of Technology, Beijing, 100124, China

    Penghao Tang & Weiling Guo

  3. College of Physics and Information Engineering, Fuzhou University, and Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, 350100, China

    Jie Sun, Enguo Chen, Tailiang Guo & Qun Yan

  4. MOE Key Laboratory for Analytical Science of Food Safety and Biology, College of Chemistry, Fuzhou University, Fuzhou, 350108, China

    Hongjuan Feng & Jibin Song

  5. Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Gothenburg 41296, Sweden

    Jie Sun

Authors
  1. Zaifa Du
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  2. Jie Sun
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  4. Penghao Tang
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  8. Tailiang Guo
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Contributions

ZD and JS: designed experiments and wrote the main manuscript text, ZD and PT: conducted the experiments, HF and JS. provided experimental materials: WG and KH: provided experimental guidance and manuscript revision, EC, TG, QY and JS, provided guidance and funding for the experiments. All authors reviewed the manuscript.

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Correspondence to Jie Sun or Qun Yan.

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Du, Z., Sun, J., Feng, H. et al. Efficiency enhancement of micro-light-emitting diode with shrinking size by localized surface plasmons coupling. Appl. Phys. B 130, 36 (2024). https://doi.org/10.1007/s00340-024-08174-4

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