Journal
ADVANCED ELECTRONIC MATERIALS
Volume 7, Issue 1, Pages -Publisher
WILEY
DOI: 10.1002/aelm.202000626
Keywords
electro‐ microfluidic spinning technology; LCD backlights; photonic crystals; polyamide 66 nanofibers; quantum dots
Funding
- National Natural Science Foundation of China [21736006, 21908104]
- Natural Science Foundation of Jiangsu Province [BK20190673]
- Fund of State Key Laboratory of Materials-Oriented Chemical Engineering [ZK201704, ZK201810]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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This study developed a novel nanotechnology to fabricate a QD-converting film for LCD backlights, which exhibited good flexibility and stability, effectively addressing the limitations of QD fluorescent materials in LCDs.
Quantum dot (QD)-based liquid crystal displays (LCDs) are emerging as a new generation of LCDs due to their good performance. However, the QD fluorescent materials in LCDs are vulnerable to water and high temperatures, severely limiting their practical and long-term use. Here, flexible and ultrastable QD-based color-converting films for LCD backlights are fabricated using robust poly(styrene-methyl-methacrylate-acrylic acid) (poly(St-MMA-AA)) nanoparticle/polyamide 66 nanofiber (NPs@PA66) film with unique fiber-particle-fiber microstructure as protective substrate. Through an emerging strategy called electro-microfluidic spinning technology (EMST), the nanofiber film not only exhibits excellent flexibility but also remarkably improves the mechanical property via the in situ particle-mediated enhancement mechanism. An LCD backlight using the NPs@PA66 nanofiber film as QD loading substrate shows a wide color gamut of 116% and long-term fluorescence stability under high temperature of 200 degrees C. More importantly, the fluorescence lifetime of NPs@PA66/QDs backlight reaches up to approximate to 64500 h, approximate to 22 times higher than that using encapsulated sandwiched polyethylene terephthalate (PET) QD film. These findings offer a promising method toward high-strength nanofiber manufacturing, high-stability flexible electronics and optoelectronic display devices.
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