Enhanced Light Extraction Efficiency and Modulation Bandwidth of Deep-Ultraviolet Light-Emitting Diodes with Al Nanospheres

Hu, Xiaolong; Xu, Liang; Tang, Lingyun; Liu, Wenjie

doi:10.3390/cryst12020289

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…For DUV LEDs (wavelengths between 250 nm and 300 nm), EQE values are below 10% [6]. As an important factor of EQE, the light-extraction efficiency (LEE) is as low as 9% without any assisted light extraction [7,8]. The main reason for low LEE is the refractive index contrast between the chip and the environment [9,10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Thin Fluorine Resin Film on DUV LED Packaging Devices

Tang

Yang

et al. 2023

Applied Sciences

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Amorphous fluorine resin is a promising material that can be used for the encapsulation of deep-ultraviolet light-emitting diodes (DUV LEDs) to promote the light output, due to its light characteristics which mean it shows no absorption in the DUV wavelength region. However, obvious decay and high cost are the problems faced by fluorine resin. In this study, thin-fluorine-resin-film-packaged DUV LEDs were fabricated by the drip-coating method and the characteristics were tested. The results show that the light output power increased from 4.95 mW to 5.44 mW at 40 mA, and the cost of fluorine resin can be reduced to ~10%. In addition, no degradation during the aging was observed. However, when the light output power reached 12 mW or higher, >10% decay was observed after aging for 1000 h. In conclusion, thin-fluorine-resin-film-packaged DUV LEDs can achieve 10% light output power enhancement by using less fluorine resin material, and the material is more applicable to low-power DUV LEDs.

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Section: Introductionmentioning

confidence: 99%

Influence of Thin Fluorine Resin Film on DUV LED Packaging Devices

Tang

Yang

et al. 2023

Applied Sciences

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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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Enhanced THz Transmission by Bull’s Eye Structure Integrated with a Concentric Gold Hemisphere

et al. 2022

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In this work, a hemispheric gold particle is introduced to the conventional bull’s eye structure that enhances extraordinary optical transmission in the terahertz region. Transmission enhancement is a result of the coupling of surface plasmon polaritons generated by periodic grooves and localized surface plasmon resonances generated by the hemisphere particle. The maximum normalized-to-area transmission peak reaches 556 for the hemisphere-in-hole bull’s eye structure, which is significantly higher than conventional bull’s eye structure. Such a transmission property is insensitive to polarization direction. The physical mechanisms are thoroughly analyzed by geometric parameter optimization and electromagnetic simulations. The modified structure can reduce the number of grooves in need, thereby reducing the device area. This novel design can be instructive for future improvement of bull’s eye applications.

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Enhanced Light Extraction Efficiency and Modulation Bandwidth of Deep-Ultraviolet Light-Emitting Diodes with Al Nanospheres

Cited by 4 publications

References 31 publications

Influence of Thin Fluorine Resin Film on DUV LED Packaging Devices

Influence of Thin Fluorine Resin Film on DUV LED Packaging Devices

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 THz Transmission by Bull’s Eye Structure Integrated with a Concentric Gold Hemisphere

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