Fabrication of Cross-Linked Quantum Dot/Colorless-Polyimide Nanocomposites for Highly Efficient and Long-Term Stable Light-Emitting Diodes
- Authors
- Heo, H.S.; Jo, J.H.; Lee, S.J.; Yun, C.; Choi, S.-H.; Lee, J.H.; Lee, K.
- Issue Date
- Aug-2022
- Publisher
- American Chemical Society
- Citation
- Chemistry of Materials, v.34, no.15, pp.6958 - 6967
- Journal Title
- Chemistry of Materials
- Volume
- 34
- Number
- 15
- Start Page
- 6958
- End Page
- 6967
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42470
- DOI
- 10.1021/acs.chemmater.2c01335
- ISSN
- 0897-4756
- Abstract
- Quantum dot (QD)/colorless-polyimide (CPI) nanocomposites were fabricated and utilized as the color conversion layer in a light-emitting diode. CPIs with different lengths and end groups were synthesized and used both as surface ligands on the QDs and matrix polymers. Thereafter, nanocomposites were fabricated by the cross-linking reaction between the diphthalic anhydride-terminated matrix CPI and diamine-terminated CPI that was grafted onto the QDs. The degree of cross-linking in the nanocomposites was controlled by varying the length of the matrix CPI and QD concentrations; the highest quantum efficiency was observed at the highest degree of cross-linking because of the improved dispersion of the QDs. The cross-linked QD/CPI nanocomposite exhibited superior fluorescent properties and stability against heat and moisture to the un-cross-linked QD/CPI and QD/poly(methyl methacrylate) nanocomposites. Light-emitting diodes with high color accuracy and a wide color gamut were successfully fabricated using the cross-linked QD/CPI nanocomposite. © 2022 American Chemical Society.
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