Quantum dot ink, quantum dot film and light-emitting device

A technology of light-emitting devices and quantum dots, which is applied in the field of light-emitting and display, can solve the problems of easy phase separation and unfavorable printing, and achieve the effect of suppressing quenching and increasing distance

Active Publication Date: 2022-02-22
GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mixing quantum dots with organic polymers to make inks is prone to phase separation, which is not conducive to printing

Method used

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  • Quantum dot ink, quantum dot film and light-emitting device
  • Quantum dot ink, quantum dot film and light-emitting device

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] Another embodiment of the present invention also provides the preparation method of above-mentioned quantum dot ink, comprises the following steps:

[0058] According to the above-mentioned components and proportions of the quantum dot ink, disperse the luminous quantum dots and spacer quantum dots in an organic solvent and mix them uniformly to prepare the quantum dot ink.

[0059] In some of the embodiments, the stirring time for uniform mixing is 5 minutes to 60 minutes.

[0060] An embodiment of the present invention also provides a quantum dot thin film, including luminescent quantum dots and spaced quantum dots. Wherein, the luminescent quantum dot includes a first quantum dot core and a first shell layer covering the first quantum dot core.

[0061] The luminescent quantum dot includes a first quantum dot core and a first shell layer covering the first quantum dot core, and the first shell layer is a II-VI group material.

[0062] Spaced quantum dots, comprisin...

Embodiment 1

[0076] Quantum dot inks include organic solvents, luminescent quantum dots and spacer quantum dots.

[0077] Among them, the organic solvent is tetralin, the luminescent quantum dot is CdSe(5nm) / ZnS(8nm), and the spacer quantum dot is CdSe(5nm) / ZnS(8nm) / SiO 2 (5nm). In the quantum dot ink, the mass percentage of tetralin is 95%, the mass percentage of luminescent quantum dots is 2.5%, and the mass percentage of spacer quantum dots is 2.5%.

[0078] The preparation process of the above-mentioned quantum dot ink is as follows: add the following components to a 500mL single-necked flask, and the order of addition is: 5g luminescent quantum dots, 5g spacer quantum dots, 190g tetralin solvent, fully shake and stir for 60 minutes to obtain 200g quantum dots ink.

[0079] The structure of the quantum dot electroluminescent device includes a substrate 100 , an anode layer 101 , a hole injection layer 102 , a hole transport layer 103 , a light emitting layer 104 , an electron transpo...

Embodiment 2

[0087] Quantum dot inks include organic solvents, luminescent quantum dots and spacer quantum dots.

[0088] Among them, the organic solvent is a binary mixed solvent composed of methyl nonanoate and dicyclohexyl; the luminescent quantum dots are CdSe(5nm) / ZnS(5nm), and the spacer quantum dots are CdSe(5nm) / ZnS(5nm) / SiO 2 (8nm). In the quantum dot ink, the mass percentage of methyl nonanoate is 50%, the mass percentage of dicyclohexyl is 46%, the mass percentage of luminescent quantum dots is 1.6%, and the mass percentage of spacer quantum dots is 2.4%.

[0089] The preparation process of quantum dot ink includes: adding the following components into a 500mL single-necked flask, the addition order is: 3.2g luminescent quantum dots, 4.8g spacer quantum dots, 100g methyl nonanoate solvent, 92g dicyclohexyl solvent, fully Shake and stir for 60 minutes to obtain 200 g of quantum dot ink.

[0090] The structure of the quantum dot electroluminescent device is similar to that of Ex...

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Abstract

The invention provides quantum dot ink, a quantum dot film and a light-emitting device. The quantum dot ink comprises a light-emitting quantum dot, an interval quantum dot and an organic solvent, the light-emitting quantum dot comprises a first quantum dot core and a first shell layer wrapping the first quantum dot core, and the first shell layer is made of a II-VI family material; the interval quantum dot comprises a second quantum dot core and a second shell layer coating the second quantum dot core; the band gap of the second shell layer is larger than that of the first shell layer, and the band gap of the second shell layer is larger than 4.0 eV; and the light-emitting quantum dot and the interval quantum dot are dissolved in the organic solvent. The quantum dot ink can effectively inhibit FRET between quantum dots, and can be suitable for ink-jet printing. The quantum dot ink and the quantum dot film can improve the fluorescence efficiency of the quantum dot film, and further improve the light emitting efficiency of the light-emitting device.

Description

technical field [0001] The invention relates to the technical field of light emission and display, in particular to a quantum dot ink, a quantum dot thin film and a light emitting device. Background technique [0002] Colloidal quantum dots have been used as light-emitting layers in light-emitting diodes and have attracted widespread attention due to their unique advantages such as adjustable luminous color, high color purity, high fluorescence efficiency, good photostability and easy solution processing. Dispersing quantum dots in a specific solvent can form corresponding quantum dot inks, and then through inkjet printing technology, quantum dots can be accurately deposited at designated positions to form precise pixel films, which can effectively solve the problems of large-size QLED displays. Manufacturing problems can improve material utilization and production efficiency, reduce manufacturing costs, and increase production capacity. [0003] In recent years, with the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K71/135H10K50/115H10K71/00
Inventor 黄航
Owner GUANGDONG JUHUA PRINTING DISPLAY TECH CO LTD
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