QLED and preparing method thereof, and display device and preparing method thereof

Abstract

An embodiment of the invention provides a QLED and a preparing method thereof, and a display device and a preparing method thereof, which relate to the technical field of display, and can avoid a functional layer of an organic material positioned below a quantum dot layer from being corroded and enable the quantum dot layer to be uniform in film forming. The preparing method of the QLED comprises: forming a first electrode, a first functional layer, the quantum dot layer, a second functional layer and a second electrode on a base substrate in sequence; after the first functional layer is formed from the organic material and before the quantum dot layer is formed, the preparing method further comprises: forming a buffer layer made from a polar organic solvent; on the basis, forming the quantum dot layer which includes: forming a solution containing quantum dots and a nonpolar organic solvent above the buffer layer by adopting an ink-jet printing manner; evaporating the solvent by an evaporation process to form the quantum dot layer. The preparing method is used for the QLED.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a QLED and a preparation method thereof, a display device and a preparation method thereof. Background technique [0002] Quantum dots (quantumdot) are composed of a limited number of atoms, and the three dimensions are all on the order of nanometers. Due to the quantum size effect, the half-peak width of the quantum dot light is very narrow, so it has excellent color purity. The quantum dot material is made into a quantum dot light-emitting diode (QuantumDotLightEmittingDiode, referred to as QLED), which can achieve a higher ratio than the organic light-emitting diode (OrganicLight-EmittingDiode). EmittingDiode, referred to as OLED) display device better color gamut. [0003] Among them, as figure 1 The QLED shown is taken as an example, which may include a base substrate 10 , an anode 20 , a hole transport layer 301 , a quantum dot layer 40 , an electron transport la...

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Problems solved by technology

[0004] However, since the hole transport layer 301 is an organic material, it will be dissolved by a non-polar organic solvent when making the quantum dot layer 40, which will cause the hole transport layer 301 to be corroded and the quantum dot layer 40 to be uneven, which will lead to QLED failure. poor performance

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