4.7 Article

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

Journal

SCIENCE CHINA-MATERIALS
Volume 62, Issue 10, Pages 1463-1469

Publisher

SCIENCE PRESS
DOI: 10.1007/s40843-019-9435-7

Keywords

quantum dot; silica coating; color filter; ligand exchange

Funding

  1. National Key Research and Development Program of China [2016YFB0401702]
  2. National Natural Science Foundation of China [61674074, 61704072, 61405089]
  3. Shenzhen Innovation Project [JCYJ20160301113537474]
  4. Shenzhen Basic Research Project [JCYJ20170817112012493]
  5. Development and Reform Commission of Shenzhen Project [[2017]1395]
  6. Shenzhen Peacock Team Project [KQTD2016030111203005]
  7. Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting [ZDSYS201707281632549]
  8. Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting [2017KSYS007]
  9. Distinguished Young Scholar of National Natural Science Foundation of Guangdong [2017B030306010]
  10. Tianjin Zhonghuan Quantum Tech Co., Ltd. [18YFZCGX00580]
  11. Southern University of Science and Technology
  12. Pico Center at SUSTech
  13. Presidential fund and Development and Reform Commission of Shenzhen Municipality
  14. China Postdoctoral Science Foundation [2018M631443]

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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.

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