Quantum dots printing paste for display backlights: Preparation, characterization, and applications

Quantum dots (QDs) are one kind of photoluminescent materials with excellent properties, such as adjustable spectrum, narrow full width at half maximum (FWHM), and high color gamut. In this paper, a photoluminescent QDs printing paste suitable for light guide dots array applied in the backlight for liquid crystal display (LCD) was presented. The QDs printing paste was first prepared and characterized with different kinds of solvents. Then, triphenyl phosphite (TPP), a kind of antioxygen, was added into the QDs printing paste to improve the stability of the QDs printing paste. Finally, a QDs light guide plate (LGP) was fabricated by screen printing with QDs printing paste added with silicon dioxide (SiO2) light scattering particles. The color gamut of QDs LGP arrived 131.6%NTSC due to light scattering interaction between blue LED, red QDs, green QDs, and SiO2 particles. The results showed that the QDs-chloroform printing paste had uniform light output and the highest photoluminescent peak intensity. Therefore, the composite screen printing paste has wide application prospects in the backlight of LCD, with the advantages of simple process, high production efficiency, and low cost.

Automated summary

This paper presents a photoluminescent quantum dot (QD) printing paste for light guide dots array used in the backlight of liquid crystal display (LCD). Different solvents were used to prepare and characterize the QD printing paste, which was then enhanced with an oxygen inhibitor called triphenyl phosphite (TPP) to improve its stability. The QD printing paste was used in screen printing to fabricate a QD light guide plate (LGP) with silicon dioxide (SiO2) light scattering particles. The QDs LGP achieved a color gamut of 131.6%NTSC due to light scattering interaction among blue LED, red QDs, green QDs, and SiO2 particles. The study shows that the QDs-chloroform printing paste has uniform light output and the highest photoluminescent peak intensity, making it a promising option for the LCD backlight with its simple process, high production efficiency, and low cost.