Low-voltage wide-field-of-view lidar scanning system based on a MEMS mirror

Zhou, Jingkun; Qian, Keyuan

doi:10.1364/ao.58.00a283

Cited by 13 publications

(8 citation statements)

References 7 publications

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“…Unfortunately, there are two key problems: high manufacturing costs and low blue-color radiation efficacy owing to considerable reabsorption between green-emitting and red-emitting phosphors. As a result, several investigations have concentrated on producing efficient, long-lasting, solitary white-light phosphors with red, green, and blue (RGB) elements using the energy transmission (ET) process from sensitizers to activators [14]- [16]. In various types of WLED phosphors, co-doping Ce 3+ , Tb 3+ , or Mn 2+ ions is a popular technique for generating white luminescence via ET in solitary phosphors [17]- [19].…”

Section: Introductionmentioning

confidence: 99%

Luminescence and transfer for power characteristics of Sr4La(PO4)3O:Ce3+,Tb3+,Mn2+ phosphor for WLEDs

Thi

2022

IJEECS

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We apply the high-heat solid-state technique to create a sequence of phosphors Sr4La(PO4)3O:Ce3+,Tb3+,Mn2+. In Sr4La(PO4)3Othe luminescence characteristics, heat resistance, and transfer of energy between Ce3+ and Tb3+ as well as Mn2+ were thoroughly studied. The insertion of the sensitizer Ce3+ ions can significantly flatter the emission of the color green from Tb3+ and the emission of the color red from Mn2+ via energy transfer. By modifying the Ce3+/Tb3+ and Ce3+/Mn2+ ion ratios, it can change the emission color. White light, which has color coordinates of 0.3326, 0.3298, were produced by the Sr4La(PO4)3O: 0.12Ce3+, 0.3Mn2+ 0.12Ce3+, 0.3Mn2+ specimen, showing Sr4La(PO4)3O:Ce3+,Tb3+,Mn2+ might be profitable in white LEDs.

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Section: Introductionmentioning

confidence: 99%

Luminescence and transfer for power characteristics of Sr4La(PO4)3O:Ce3+,Tb3+,Mn2+ phosphor for WLEDs

Thi

2022

IJEECS

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“…Among the most typical ways to improve this promising source of light, there is one option which is to combine blue light taking from an inverted red phosphor with the LED chip's yellow light. It is indisputable that the configuration of LEDs and the placement of phosphor coatings have a decisive impact on the effectiveness of light production, particularly the color rendering index (CRI) [10][11][12]. As a result, numerous typical phosphor coating technologies for LED manufacture have been developed, like the distributed and the common coating [13,14].…”

Section: Introductionmentioning

confidence: 99%

Double-layer Remote Configuration with LaOF: Eu³⁺ and Sr₃WO₆:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs

Hung

Lee

2022

J. Phys.: Conf. Ser.

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Although the distant phosphor configuration is a good selection for high-luminescence WLEDs, it did not satisfy the high color adequacy standard. With the aim of achieving improved chromatic indices, including the index for color rendering (CRI) and the scale of color quality (CQS), for the distant phosphor structure, a dual-layer design with red or green phosphor addition is suggested in this research report. The color temperature of the WLEDs packets employed in this investigation is 8500 K. The phosphor configuration will be produced by layering green Sr3WO6:U or red LaOF:Eu3+ phosphor on top of the yellow phosphor YAG:Ce3+. The concentration of additional red phosphor LaOF:Eu3+ and green phosphor Sr3WO6:U will then be adjusted to observe the changes in color in luminescence performance of the WLED packages. The theory of Mie about scattering combined with Lambert Beer’s rule supports the investigation on optical results. The findings demonstrated a rise in CRI and CQS along with the existence of LaOF:Eu3+, indicating that the LaOF:Eu3+ presence has a major impact on these two elements. Because of the increased concentration of red light components within WLED packets, CRI and CQS increase with increasing concentration of LaOF:Eu3+. In the meantime, the green phosphor Sr3WO6:U improves the beams of light. However, if the concentrations of both the red LaOF:Eu3+ and the green Sr3WO6:U phosphors are above the corresponding level, the beams of light and color intensity will be reduced. The outcomes of this study are crucial references for producing WLEDs with greater light of white standard.

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“…However, a design trade-off exists between the scanning speed, the size, and the tilt angle of the MEMS mirror [16,17], and the current MEMS LiDAR system usually suffers from a small field of view (FOV) [18]. Much complicated optical design is typically required to achieve a large scanning FOV, which increases the complexity of the LiDAR design [19,20]. In our early study, we proposed a semi-coaxial MEMS LiDAR design, based on a synchronous MEMS mirror pair, which consists of two uniaxial MEMS mirrors, one mirror as the transmitter, and the other as the receiver [21].…”

Section: Introductionmentioning

confidence: 99%

Fast Synchronization Method of Comb-Actuated MEMS Mirror Pair for LiDAR Application

Qiao

Xia³

et al. 2021

Micromachines

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MEMS-based LiDAR (micro-electro–mechanical system based light detection and ranging), with a low cost and small volume, becomes a promising solution for the two-dimensional (2D) and three-dimensional (3D) optical imaging. A semi-coaxial MEMS LiDAR design, based on a synchronous MEMS mirror pair, was proposed in our early study. In this paper, we specifically reveal the synchronization method of the comb-actuated MEMS mirror pair, including the frequency, amplitude, and phase synchronization. The frequency sweeping and phase adjustment are simultaneously implemented to accelerate the MEMS mirror synchronization process. The experiment is set up and the entire synchronization process is completed within 5 s. Eventually, a one-beam MEMS LiDAR system with the synchronous MEMS mirror pair is set up and a LiDAR with a field of view (FOV) of 60°, angular resolution of 0.2°, and frame rate of 360 Hz is obtained. The experimental results verify the feasibility of the MEMS mirror synchronization method and show a promising potential application prospect for the MEMS LiDAR system.

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Low-voltage wide-field-of-view lidar scanning system based on a MEMS mirror

Cited by 13 publications

References 7 publications

Luminescence and transfer for power characteristics of Sr4La(PO4)3O:Ce3+,Tb3+,Mn2+ phosphor for WLEDs

Luminescence and transfer for power characteristics of Sr4La(PO4)3O:Ce3+,Tb3+,Mn2+ phosphor for WLEDs

Double-layer Remote Configuration with LaOF: Eu³⁺ and Sr₃WO₆:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs

Fast Synchronization Method of Comb-Actuated MEMS Mirror Pair for LiDAR Application

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Low-voltage wide-field-of-view lidar scanning system based on a MEMS mirror

Cited by 13 publications

References 7 publications

Luminescence and transfer for power characteristics of Sr4La(PO4)3O:Ce3+,Tb3+,Mn2+ phosphor for WLEDs

Luminescence and transfer for power characteristics of Sr4La(PO4)3O:Ce3+,Tb3+,Mn2+ phosphor for WLEDs

Double-layer Remote Configuration with LaOF: Eu3+ and Sr3WO6:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs

Fast Synchronization Method of Comb-Actuated MEMS Mirror Pair for LiDAR Application

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Double-layer Remote Configuration with LaOF: Eu³⁺ and Sr₃WO₆:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs