Toward Ultra-stable Barrier-free Quantum Dots-Color Conversion Film via Zinc Phenylbutyrate Modification

Area of Science:

• Materials Science
• Nanotechnology
• Display Technology

Background:

• Quantum dot color conversion films (QD-CCFs) offer superior color performance and efficiency for displays.
• Long-term stability of QD-CCFs without additional barrier coatings is a significant challenge.

Purpose of the Study:

• To develop a surface passivation strategy for quantum dots (QDs) to enhance the stability of QD-CCFs.
• To improve the environmental resistance and color performance of QD-CCFs.

Main Methods:

• Surface passivation of QDs using zinc phenylbutyrate (Zn(PA)2) via a trioctylphosphine-mediated reaction.
• Selective capping of surface sulfur atoms by zinc-monophenylbutyrate.
• Density functional theory (DFT) calculations and multiple-washing tests to assess passivation robustness.
• Copolymerization of modified QDs with styrene to create QD-polystyrene (QD-PS) CCFs.

Main Results:

• Robust Zn(PA)2 binding effectively passivates the QD surface, enhancing environmental resistance.
• Phenylbutyrate groups improve QD solubility in styrene, enabling high QD concentration in QD-PS CCFs.
• Developed QD-PS CCFs exhibit excellent light uniformity and long-term stability (over 500 h) under water immersion and photoaging.
• CCFs with green and red QDs achieve a color gamut exceeding 120% of the NTSC standard.

Conclusions:

• The surface passivation strategy using Zn(PA)2 provides effective QD stabilization for CCFs.
• This method enhances QD-CCF stability, light uniformity, and color gamut, crucial for advanced display applications.
• The approach offers a viable route to stable, high-performance QD-CCFs without complex barrier films.