Quantum Dot Color Conversion Film with Enhanced Color Rendering Performance

Quantum dot (QD) color conversion (QDCC) film with monochrome excitation backlight is a promising way to implement mini/micro-LED displays. However, it still faces the challenges of low color conversion efficiency and unsatisfied color gamut owing to insufficient QD concentration in QD-polymer solution. In this paper, we studied the influence of QD surface modification and solvent on the QD-polymer solution stability and QD concentration. The QD concentration was improved by modifying QDs with carboxyl-acid-modified polyethylene glycol (PEG-COOH) ligands and adding additional toluene into the solution. The color conversion efficiency and the color gamut of the QDCC film were improved accordingly.