Quantum Dot Light Emitting Element Using Water-Alcohol Soluble Polymers

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Solution Overview

Problem

Conventional quantum dot light emitting elements face issues with poor lighting efficiency and low fabrication success due to damage of the quantum dot light emitting layer during the formation of adjacent layers, primarily because of the use of organic solutions in the fabrication process.

Innovation Solution

A quantum dot light emitting element is designed with a substrate, cathode, electron injection/electron transport layer, quantum dot light emitting layer, and hole injection/hole transport layer, where the electron injection/electron transport layer comprises water-alcohol soluble conjugated polymers (WACPs) that can be dissolved in polar solutions like water and formaldehyde, preventing damage to the quantum dot light emitting layer, and the hole injection/hole transport layer uses p-type metal oxides, enhancing the element's performance and eco-friendliness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If organic solutions are used to form films during fabrication, then the film formation process can be completed, but the quantum dot light emitting layer may be damaged by the processed film

Engineering Contradiction:

Improvefilm formation processVSAvoidlighting efficiency

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the chemical parameters of the solution from organic to water-alcohol soluble conjugated polymer system. This parameter change allows the electron transport layer to be formed without using harmful organic solutions that damage the quantum dot light emitting layer, thus resolving the contradiction between ease of manufacture and reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The water-alcohol soluble conjugated polymer acts as an intermediary material that enables film formation without directly damaging the quantum dot light emitting layer. This intermediary approach allows the electron transport layer to be formed while protecting the sensitive quantum dot layer, solving the contradiction between manufacturing feasibility and device performance

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If conventional fabrication methods are used with multiple layers formed sequentially, then the device structure can be built, but the fabrication success probability is low due to layer damage

Engineering Contradiction:

Improvelayered structureVSAvoidfabrication success probability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent changes the material parameters of the electron transport layer to water-alcohol soluble conjugated polymers, which can be processed without damaging the quantum dot light emitting layer. This parameter change maintains the required layered structure while significantly improving fabrication success probability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potentially harmful effect of film processing into a beneficial process by using water-alcohol soluble materials that are gentle on the quantum dot layer. The processing that would normally cause damage is transformed into a protective approach, maintaining structural complexity while improving fabrication success

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The use of WACPs in the electron injection/electron transport layer improves the performance of the quantum dot light emitting element by preventing layer damage during film formation, while being non-toxic and environmentally friendly, thus enhancing the lighting efficiency and fabrication success.

Implementation Method 1

The electron injection/electron transport layer is used for transmitting the electrons to the quantum dot light emitting layer

Methodology Applied

Scientific EffectElectron conduction: Conduction (electrical)

Implementation Method 2

The hole injection/hole transport layer is used for transmitting the holes to the quantum dot light emitting layer

Methodology Applied

Scientific EffectHole conduction: Conduction (electrical)

Implementation Method 3

The electrons and the holes recombine in the quantum dot light emitting layer for emitting light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10115921B2Quantum dot light emitting element, method of fabricating the same, and liquid-crystal display

Publication Date: 2018.10.30 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

A quantum dot light emitting element includes a substrate, a cathode arranged on the substrate for supplying electrons, an electron injection/electron transport layer, a quantum dot light emitting layer, a hole injection/hole transport layer, and an anode for supplying holes. The cathode and the anode are arranged on the same side of the substrate. The electron injection/electron transport layer, the quantum dot light emitting layer, and the hole injection/hole transport layer are inserted between the cathode and the anode. One side of the electron injection/electron transport layer is connected to the cathode. The electron injection/electron transport layer and hole injection/hole transport layer are used for transmitting the electrons and the holes to the quantum dot light emitting layer, respectively. The electrons and the holes recombine in the quantum dot light emitting layer for emitting light. The electron injection/electron transport layer comprises a water-alcohol soluble conjugated polymer (WACPs).