Improving the Performance of Free-pGaN Deep-Ultraviolet Light-Emitting Diodes by Embedding Self-Assembled Ni Nanoparticles Between p-AlGaN/p-Electrode

Jia, Tong; Wang, Bing; Zhang, Gai; Chu, Chunshuang; Fan, Chao; Zhang, Yonghui; E, Wenwen; Liu, Naixin; Zhang, Zi-Hui; Yan, Jianchang

doi:10.1109/ted.2023.3325422

IEEE Trans. Electron Devices

2023

DOI: 10.1109/ted.2023.3325422

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Improving the Performance of Free-pGaN Deep-Ultraviolet Light-Emitting Diodes by Embedding Self-Assembled Ni Nanoparticles Between p-AlGaN/p-Electrode

Tong Jia,

Bing Wang,

Gai Zhang

et al.

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2024

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Cited by 2 publications

References 38 publications

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Enhancing light extraction efficiency of the inclined-sidewall-shaped DUV micro-LED array by hybridizing a nanopatterned sapphire substrate and an air-cavity reflector

Liu,

Jia,

Chu

et al. 2024

Opt. Express

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In this work, we hybridize an air cavity reflector and a nanopatterned sapphire substrate (NPSS) for making an inclined-sidewall-shaped deep ultraviolet micro light-emitting diode (DUV micro-LED) array to enhance the light extraction efficiency (LEE). A cost-effective hybrid photolithography process involving positive and negative photoresist (PR) is explored to fabricate air-cavity reflectors. The experimental results demonstrate a 9.88% increase in the optical power for the DUV micro-LED array with a bottom air-cavity reflector when compared with the conventional DUV micro-LED array with only a sidewall metal reflector. The bottom air-cavity reflector significantly contributes to the reduction of the light absorption and provides more escape paths for light, which in turn increases the LEE. Our investigations also report that such a designed air-cavity reflector exhibits a more pronounced impact on small-size micro-LED arrays, because more photons can propagate into escape cones by experiencing fewer scattering events from the air-cavity structure. Furthermore, the NPSS can enlarge the escape cone and serve as scattering centers to eliminate the waveguiding effect, which further enables the improved LEE for the DUV micro-LED array with an air-cavity reflector.

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Enhancing light extraction efficiency of the inclined-sidewall-shaped DUV micro-LED array by hybridizing a nanopatterned sapphire substrate and an air-cavity reflector

Liu,

Jia,

Chu

et al. 2024

Opt. Express

View full text Add to dashboard Cite

show abstract

Enhanced light extraction efficiency for the inclined-sidewall-shaped AlGaN-based DUV LED by using an omni-directional reflector with a thin hybrid dielectric layer

Liu,

Dong,

Wang

et al. 2024

Opt. Lett.

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In this Letter, an omni-directional reflector (ODR) with a thin hybrid dielectric layer (hybrid-ODR) is proposed to enhance the light extraction efficiency (LEE) for inclined-sidewall-shaped AlGaN-based deep ultraviolet light-emitting diode (DUV LED) by inserting a thin diamond with high refraction index into a conventional Al/Al2O3-based ODR. The three-dimensional finite-difference time-domain (3D FDTD) simulation results show that the LEE of TM-polarized light for the DUV LED with hybrid-ODR is enhanced by 18.5% compared with Al/Al2O3-based ODR. It is because the diamond can transform the evanescent wave in Al2O3 into the propagating light wave in diamond, thereby preventing effective excitation of the surface plasmon polariton (SPP) on the surface of the metal Al. Moreover, the Brewster’s angle effect causes the TM-polarized light in diamond to propagate effectively into AlGaN. Furthermore, decreasing the total thickness of the dielectric layer also improves the scattering effect of the inclined sidewall. However, the utilization of hybrid-ODR results in a slight reduction in the LEE for transverse electric (TE) polarized light because the light is confined to the diamond layer and eventually absorbed by the metal Al.

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Improving the Performance of Free-pGaN Deep-Ultraviolet Light-Emitting Diodes by Embedding Self-Assembled Ni Nanoparticles Between p-AlGaN/p-Electrode

Cited by 2 publications

References 38 publications

Enhancing light extraction efficiency of the inclined-sidewall-shaped DUV micro-LED array by hybridizing a nanopatterned sapphire substrate and an air-cavity reflector

Enhancing light extraction efficiency of the inclined-sidewall-shaped DUV micro-LED array by hybridizing a nanopatterned sapphire substrate and an air-cavity reflector

Enhanced light extraction efficiency for the inclined-sidewall-shaped AlGaN-based DUV LED by using an omni-directional reflector with a thin hybrid dielectric layer

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