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NIR-transparent dark paints based on diketopyrrolopyrrole pigments for LiDAR-enabled automobiles

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Abstract

Recently, light detection and ranging (LiDAR) technology is being used in autonomous vehicles. The LiDAR emits a laser in the near-infrared (NIR) region and receives light reflected from the object to measure the distance and structure. However, the current dark-tone pigment is based on carbon black, so it absorbs not only visible light but also NIR, making it difficult to sense in LiDAR. We have developed a dark-tone paint bilayer structure that can reflect NIR. To achieve effective penetration within the near-infrared (NIR) spectrum, while simultaneously absorbing visible light, a novel set of diketopyrrolopyrrole (DPP) derivatives were synthesized and blended with yellow and blue organic pigments. This resulted in the production of a dark-tone pigment that was subsequently applied to layers possessing high levels of NIR reflectivity. As a result, we made a black pigment close to carbon black under Br-phenyl-DPP:Yellow151:CuPc = 1:1:3 conditions (L* = 27.0, a*  =  − 0.03, and b* = 0.35), and secured a high NIR reflectivity of 58.07% and good ultraviolet resistance (ΔE = 0.29). We expect this result to be used as a dark-tone pigment applicable to LiDAR.

Graphical abstract

In this study, we mixed three different organic pigments to develop an NIR-transparent dark-tone pigment. And this dark-tone pigment is coated on the NIR-reflective layer to construct NIR-reflective dart-tone bilayer. As a result, we fabricated the black color (L* = 27.0, a* = − 0.03, and b* = 0.35) with high NIR reflectivity (58.07%) and also good ultraviolet resistance (ΔE = 0.29)

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Acknowledgements

The authors would like to thank Gangnam Jevisco Co. for their helpful discussion about paint coatings and supply of materials for paint systems. This work was supported by the Technology Innovation Program (20004663) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea) and KIST institutional program.

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Authors and Affiliations

  1. Materials Architecturing Research Center, Korea Institute of Science Technology, Seoul, 02792, Republic of Korea

    Sung Ho Yu, Taeho Lim, Kyung-Youl Baek & Sangho Cho

  2. Department of Chemistry, Hanyang University, Seoul, 04763, Republic of Korea

    Sung Ho Yu & Myung Mo Sung

  3. Division of Nano and Information Technology, KIST School, Korea University of Science and Technology, Seoul, 02792, Republic of Korea

    Kyung-Youl Baek & Sangho Cho

  4. KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul, 02447, Republic of Korea

    Kyung-Youl Baek

  5. Display Research Center, Korea Electronics Technology Institute, Seongnam-si, Kyounggi-do, 113509, Republic of Korea

    Young-Seok Kim

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  1. Sung Ho Yu
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Correspondence to Sangho Cho.

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13233_2023_199_MOESM1_ESM.docx

Supplementary file1 Information is available regarding the NMR spectra of DPP derivatives, and UV-vis spectra of organic pigments. The materials are available via the Internet at http://www.springer.com/13233.)) (DOCX 511 KB)

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Yu, S.H., Lim, T., Baek, KY. et al. NIR-transparent dark paints based on diketopyrrolopyrrole pigments for LiDAR-enabled automobiles. Macromol. Res. 31, 1199–1207 (2023). https://doi.org/10.1007/s13233-023-00199-6

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  • DOI: https://doi.org/10.1007/s13233-023-00199-6

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