Preparation method of functional layer of QLED device

A technology of functional layers and devices, applied in the field of preparation of functional layers of QLED devices, can solve problems such as coffee ring, affecting film formation uniformity, etc., and achieve the effects of improving film formation uniformity, improving performance stability, and eliminating coffee ring effect.

Active Publication Date: 2018-11-02
TCL CORPORATION
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing the functional layer of a QLED device, aiming to solve the problem that the coffee ring phenomenon exists in the existing method for preparing the functional layer of a QLED device by inkjet printing and affects the uniformity of film formation

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  • Preparation method of functional layer of QLED device
  • Preparation method of functional layer of QLED device
  • Preparation method of functional layer of QLED device

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Embodiment Construction

[0015] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0016] An embodiment of the present invention provides a method for preparing a functional layer of a QLED device, comprising the following steps:

[0017] S01. Provide pre-patterned pixel grooves;

[0018] S02. Provide an inkjet printing device provided with two nozzles, which are respectively used to hold functional layer ink and solvent vapor, first spray functional layer ink droplets on the base layer of the pixel groove through one nozzle, and then pass through another nozzle Spray the solvent vapor on the surface of the ink droplet of the functional layer, dry and form a film to prep...

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Abstract

The invention provides a preparation method of a functional layer of a QLED device. The method comprises the following steps of providing a pre-patterned pixel channel; providing inkjet printing equipment provided with two nozzles for containing functional layer ink and solvent vapor separately; and firstly spraying and dripping functional layer ink droplets on a substrate layer of the pixel channel through one spray head, then spraying the solvent vapor on the surfaces of the functional layer ink droplets through the other spray head and carrying out drying and film forming to prepare a functional layer, wherein the functional layer comprises a hole injection layer, a hole transport layer, a quantum dot light-emitting layer, an electron transport layer and an electron injection layer; thefunctional layer ink comprises a functional layer material and an ink solvent; the flow of the solvent vapor meets the condition that local bias pressure is greater than vapor pressure at corresponding temperature; a solvent used for the solvent vapor meets the condition that the liquid phase surface tension of the solvent is smaller than that of the ink solvent; the solvent vapor and the ink solvent are mutually dissolved; and the functional layer material can be dissolved.

Description

technical field [0001] The invention belongs to the technical field of quantum dot light-emitting diodes, in particular to a method for preparing a functional layer of a QLED device. Background technique [0002] Inorganic nanocrystalline quantum dot luminescent materials not only have the advantages of saturated color of emitted light and adjustable wavelength, but also have high photoluminescence and electroluminescence quantum yields, which are suitable for the preparation of high-performance display devices. In addition, from the perspective of preparation technology, quantum dot luminescent materials can be prepared into films by spin coating, printing, printing equipment and other solution processing methods under non-vacuum conditions. Therefore, quantum dot light-emitting diodes (QLEDs) prepared with quantum dot films have become a strong competitor for next-generation display technologies. [0003] Generally, a QLED device includes a first electrode, a hole injecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/00H01L51/56H01L51/50
CPCH10K71/135H10K71/15H10K50/115H10K71/00
Inventor 陈崧钱磊杨一行曹蔚然向超宇
Owner TCL CORPORATION
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