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Surface modification toward luminescent and stable silica-coated quantum dots color filter

通过表面钝化实现稳定发光的硅包覆量子点滤色片

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Abstract

A highly pixelated and luminescent silica-coated quantum dot color filter (QDCF) was achieved by surface conjugation with epoxy functional group. Epoxy-functiona-lized silica-coated quantum dots (QDs) can be thoroughly mixed with SU-8 photoresist up to 25 wt.% without aggregation. The quantum yield (QY) of the silica-coated QDCF can be significantly improved from 19.3% to 36.5% after epoxy treatment. The pristine QDCF experienced a 40% QY decrease, while the epoxied silica-coated QDCF maintained its luminescence even after irradiation (300 mW cm −2 @450 nm) for over 25 days. The well-controlled epoxy cap plays a critical role in attaining the ideal optical properties of the QDCF.

摘要

通过表面连接环氧基团得到高亮度像素化的二氧化硅包覆量子点滤色片(QDCF). 环氧基功能化的二氧化硅包覆量子点可以与SU-8光刻胶均匀混合, 且混合比例高达25%. 经环氧基处理之后, 二氧化硅包覆QDCF的量子产率(QY)从19.3%提高到36.5%. 合成的QDs经过25天的光照辐射(300 mW cm–2@450 nm), QY较初始值降低了65%, 而环氧基二氧化硅包覆的QDCF没有明显衰减, 说明环氧基调控对QDCF的光学性能起到了关键作用.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China administrated by the Ministry of Science and Technology of China (2016YFB0401702), the National Natural Science Foundation of China (61674074, 61704072 and 61405089), Shenzhen Innovation Project (JCYJ20160301113537474), Shenzhen Basic Research Project (JCYJ20170817112012493), Development and Reform Commission of Shenzhen Project ([2017]1395), Shenzhen Peacock Team Project (KQTD2016030111203005), Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting (ZDSYS201707281632549), Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting (2017KSYS007), Distinguished Young Scholar of National Natural Science Foundation of Guangdong (2017B030306010), Tianjin Zhonghuan Quantum Tech Co., Ltd. (18YFZCGX00580) and the start-up fund from Southern University of Science and Technology. This work was also supported by the Pico Center at SUSTech that received support from Presidential fund and Development and Reform Commission of Shenzhen Municipality, and China Postdoctoral Science Foundation Grant (2018M631443).

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Authors and Affiliations

  1. Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting, Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting, Department of Electrical & Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China

    Bingxin Zhao  (赵冰心), Xiaoli Zhang  (张晓利), Xue Bai  (白雪), Hongcheng Yang  (杨鸿成), Shang Li  (李尚), Haochen Liu  (刘皓宸), Rui Lu  (卢睿), Bing Xu  (徐冰), Liduo Wang  (王立铎), Kai Wang  (王恺) & Xiao Wei Sun  (孙小卫)

  2. Department of Chemistry, Tsinghua University, Beijing, 100084, China

    Bingxin Zhao  (赵冰心) & Liduo Wang  (王立铎)

  3. Shenzhen Planck Innovation Technologies Pte. Ltd., Shenzhen, 518112, China

    Hongcheng Yang  (杨鸿成), Shang Li  (李尚) & Junjie Hao  (郝俊杰)

Authors
  1. Bingxin Zhao  (赵冰心)
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  2. Xiaoli Zhang  (张晓利)
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  6. Junjie Hao  (郝俊杰)
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  7. Haochen Liu  (刘皓宸)
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  11. Kai Wang  (王恺)
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  12. Xiao Wei Sun  (孙小卫)
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Contributions

Author contributions Zhao B and Hao J conceived the experiments. Zhao B, Bai X and Lu R took part in detailed experiments. Zhao B and Zhang X prepared this manuscript. Liu H, Li S and Yang H were mainly responsible for the characterization in this work. Xu B provided chemicals used in this experiment. Wang L, Wang K and Sun X W carefully reviewed and modified this manuscript. All authors discussed on the results and commented on the manuscript.

Corresponding authors

Correspondence to Kai Wang  (王恺) or Xiao Wei Sun  (孙小卫).

Additional information

Conflict of interest The authors declare no conflict of interest.

Bingxin Zhao received her PhD in materials science and engineering from Beijing University of Technology in 2017. In the same year, she carried out her postdoctoral research at Tsinghua University.

Kai Wang is currently an Associate Professor in the Department of Electrical and Electronic Engineering, Southern University of Science and Technology. He received BSc and PhD degrees from Huazhong University of Science and Technology in 2006 and 2011, respectively. His current research focuses on the semiconductor nanocrystal materials and their applications in optoelectronic devices, advanced displays, and solid-state lighting.

Xiao Wei Sun is currently a Chair Professor at the Southern University of Science and Technology, Shenzhen, China. He is also the Head of the Department of Electrical and Electronic Engineering. Before joining the Southern University of Science and Technology, he worked at Nanyang Technological University, Singapore, as a Full Professor. He was the Director of the Microelectronics Center at Nanyang Technological University. His main research is currently on semiconductor nanocrystals for power-saving high-quality displays and lighting. He has authored over 400 peer-reviewed publications and delivered numerous invited talks. His H-index is 67.

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Zhao, B., Zhang, X., Bai, X. et al. Surface modification toward luminescent and stable silica-coated quantum dots color filter. Sci. China Mater. 62, 1463–1469 (2019). https://doi.org/10.1007/s40843-019-9435-7

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  • DOI: https://doi.org/10.1007/s40843-019-9435-7

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