Quantum dot ink and preparing method thereof

Abstract

The invention discloses quantum dot ink and a preparing method thereof. The quantum dot ink comprises, by mass, 0.01%-20% of quantum dots and 80%-99.99% of mixed solvent. The mixed solvent comprises at least one alkane organic solvent and at least one small-molecule alcohol organic solvent, wherein the small-molecule alcohol organic solvent is 1% to 80% of the total weight of the mixed solvent, the boiling point of the alkane organic solvent ranges from 150 DEG C to 320 DEG C, the boiling point of the small-molecule alcohol organic solvent is lower than that of the alkane organic solvent. The quantum dot ink prepared with the method has the high viscosity and the high surface tension, the requirement of an ink-spraying printing device and the requirement of the printing technology can be well met, and the organic solvent of the quantum dot ink can be removed in a vacuum evaporation or heat evaporation mode and the like to form a film of a quantum dot material.

Description

technical field [0001] The invention relates to the field of quantum dot inks, in particular to a quantum dot ink and a preparation method thereof. Background technique [0002] Semiconductor quantum dots have excellent characteristics such as high light color purity, high luminous quantum efficiency, adjustable luminous color, and long service life. These characteristics make quantum dot light-emitting diodes (QLED) with quantum dot materials as the light-emitting layer have broad application prospects in solid-state lighting, flat panel display and other fields, and have attracted extensive attention from academia and industry. [0003] Quantum dots can be dispersed in solvents to prepare printing materials such as quantum dot inks. Specifically, methods such as printing, pad printing, and spin coating can be used to manufacture quantum dot luminescent films. For example, using the drop-on-demand (DroponDemand) process similar to inkjet printing (InkjetPrinting), the quan...

AI Technical Summary

Problems solved by technology

Using this low-viscosity solvent, ink droplets are not easy to control during inkjet printing, and problems such as comet spots are prone to occur, which cannot better meet the requirements of inkjet printing technology

[0005] The viscosity, surface tension and boiling point of quantum dot inks in the prior art cannot well meet the requirements of inkjet printing equipment and printing processes, and in other published patents, in order to regulate the physical parameters of inks, these quantum dot inks Both contain other additives such as alcohol polymers

However, polymer additives with insulating properties are not easy to remove, and the introduction of such polymers tends to reduce the charge transport capability of the film, which has a negative impact on the optoelectronic performance of the device, limiting its application in the optoelectronic field.