New scheme of LiDAR-embedded smart laser headlight for autonomous vehicles

Chang, Yung-Peng; Liu, Chun-Nien; Pei, Zingway; Lee, Shu-Ming; Lai, Yeong−Kang; Han, Peng; Shih, Hsing-Kun; Cheng, Wood-Hi

doi:10.1364/oe.27.0a1481

Cited by 36 publications

(16 citation statements)

References 14 publications

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“…According to Mie-scattering theory, when the ZnO particles in conformal phosphor pc-LEDs structure induce light scattering, at that time the effect will be determined by apply a calculating tool called MATLAB [22]- [25]. The equations applied to calculate the scattering coefficient μ sca (λ), the anisotropy factor g(λ), the reduced scattering coefficient δ sca (λ) and the scattering amplitude functions S1(θ) and S2(θ) are presented as:…”

Section: Methodsmentioning

confidence: 99%

“…In another research, Yin et al presented a different high scattering enhancement configuration by applying ZnO particles with uneven surface on a flat ITO layer [24]. Lee et al experiment results also suggested that ZnO with modified surface is effective in managing lighting efficiency of GaN LEDs [25]. The many techniques to utilize ZnO particles as light transmission enhancer were introduced by previous studies, however, diffusing the ZnO on the lighting structure to achieve better optical properties was rarely mentioned.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing light scattering effect of white LEDs with ZnO nanostructures

Thi

Loan

Ngoc

2021

IJECE

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Pc-LEDs, the lighting method that blends blue LED light with yellow light from phosphor to discharge white radiation, is one of the most advance known for high lumen output. However, pc-LEDs has inferior due to angular CCT deviation, which prevent pc-LEDs from reaching better performance. As a result, this research is conducted to address the need of pc-LEDs development by introducing a configuration doped with ZnO nanoparticles. The finite-difference time-domain (FDTD) method and the phosphor layer containing ZnO were applied in the experiments. The effect of ZnO-filled on the performance of color quality pc-LEDs is confirmed through calculated results. In particular, the uniformity of scattered light is improved with the presence of ZnO. In addition, ZnO particles also minimize the deviation of color temperature and enhance the color quality. Although there is a small decline in lumen output to achieve better color temperature uniformity, however, with suitable concentrations such as 0.25% N-ZnO, 0.25% S-ZnO, and 0. 75% R-ZnO, the decline is acceptable. The research on ZnO pc-LEDs demonstrates that this affordable and simple configuration can improve lighting properties and create other directions to enhance white light

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing light scattering effect of white LEDs with ZnO nanostructures

Thi

Loan

Ngoc

2021

IJECE

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“…The reason for this solution is to prevent the later surface-encapsulation modifying the pattern on textured surface, thus making the simultaneous application of texturing and encapsulating become possible. If the two solutions are successfully combined, the LED package with GaN growth on the patterned sapphire substrate (PSS) can present 60% increase in lumen performance [13]. In particular, the slant patterns' surfaces in the PSS divert TDs sideways and thus, decreasing TDs density directed at the surface, and boost the IQE [14].…”

Section: Introductionmentioning

confidence: 99%

Decreasing CCT deviation of white light emitting diodes by employing SiO2 nanoparticles

Thi

That

2021

Bulletin EEI

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In this research, the SiO2 nano-particles (NPs) usage in enhancing optical performances of InGaN/GaN-based white light-emitting diodes (WLEDs) with remote phosphor structure. The research subject shows better lighting capacity than the white LEDs devices without the space between the layers. The adjustment in development process resulted in enhancements of internal quantum efficiency (IQE) and light extraction efficiency (LEE) that lead to 13.5% luminous efficacy improvement. From the experiments, it can be concluded that the LEE is affected by the trapped light and enhancing the light output with SiO2 scattering properties reduce the amount of trapped light. These results confirm that SiO2 nano-particles is effective in enhancing the optical performance of WLEDs and can be considered for production of higher quality devices.

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“…3, June 2021: 977 -982 978 level of thermal output reduces the light output and the wavelength deviation, moreover negatively effects the longevity of lighting devices [15,16]. One solution that was proposed to address this issue is changing the phosphor material to glass ceramic phosphors [17], ceramic phosphors [18], and phosphor-in-glass (PiG) [19,20], which is well-known for great thermal endurance.…”

Section: Introductionmentioning

confidence: 99%

Multilayer phosphor-in-glass packaging for the development in WLED color uniformity

Dang

That

2020

TELKOMNIKA

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When mentioning the remote phosphor structure, the most noticeable advantage is its higher luminous flux than any other structure's. However, there are existing flaws in their color uniformity and color rendering index (CRI). Thus, the improvements in these two optic factors must be improved for the better usage of remote phosphor geometry in modern WLED devices. Many researchers have drawn their attention to this idea, and then it has become the primary objective for their studies. In this paper, we also try to accomplish the same result by adjusting the distances between the phosphor layers and through that enhance the optical properties of WLEDs. The miescattering theory is applied in our calculations to ensure the reliability and accuracy of experimental results. In our research, with distance d=0.64 mm, the luminous flux grew 9.7% in comparison to the original value. At 0.84 mm, the distance d enhanced the color uniformity by two times. In the meantime, the CRI remained static during the course of experiment. With suitable application, these results can bring valuable contributions to the development of next WELDs generation.

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New scheme of LiDAR-embedded smart laser headlight for autonomous vehicles

Cited by 36 publications

References 14 publications

Enhancing light scattering effect of white LEDs with ZnO nanostructures

Enhancing light scattering effect of white LEDs with ZnO nanostructures

Decreasing CCT deviation of white light emitting diodes by employing SiO2 nanoparticles

Multilayer phosphor-in-glass packaging for the development in WLED color uniformity

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