Quantum dot ink based on ink-jet printing

Abstract

The invention belongs to the technical field of photoelectric display device materials and specifically relates to quantum dot ink based on ink-jet printing. The quantum dot ink is prepared from a quantum dot and an organic solvent, wherein the quantum dot material is prepared from a core-shell quantum dot system of CdS and the like or an inorganic perovskite quantum dot; the organic solvent is asingle solvent or a mixed solvent, and the single solvent or the mixed solvent is a low-polarity or non-polar solvent. According to the prepared ink disclosed by the invention, a complex ink additivefor regulating an ink film forming coffee ring is effectively avoided, and interaction force of movement of non-symmetrical quantum dots in ink is utilized to simply and effectively realize even filmformation of the quantum dots; thus, a quantum dot ink solvent system is greatly simplified; meanwhile, a selection space of a hole transport layer is widened; the quantum dot ink has the advantages of better dispersion, stability, appropriate boiling point, surface tension and viscosity, ability in meeting a requirement of quantum dot ink-jet printing and favorability for industrialization of quantum dot pixelate display.

Description

technical field [0001] The invention belongs to the technical field of photoelectric display device materials, and in particular relates to a quantum dot ink based on inkjet printing. Background technique [0002] In addition to the advantages of OLED all-solid-state, low energy consumption, ultra-thin, no viewing angle limitation, high color gamut, excellent shock resistance, and easy realization of flexible display, QLED also shows good stability and is suitable for solution method preparation. Features, with potential low manufacturing costs and other advantages. These advantages make quantum dot printing display technology considered to be the fastest growing new flat panel display technology in the future. The quantum dots in the luminescent layer are nanocrystals with quantum confinement effects and separate energy band structures. It can emit fluorescence with tunable wavelength under the conditions of light injection and current injection. The principle of quantum...

AI Technical Summary

Problems solved by technology

However, inkjet printing has strict requirements on quantum dot inks. In order to achieve jetting stability, the commonly used quantum inks add ink stabilizers, surface tension agents, viscosity modifiers, etc., although the jetting stability and film formation of ink droplets are improved. properties, but the additives will affect the charge transport in QLEDs, and some additives will even damage the quantum dots themselves