Quantum Dot Light-Emitting Layer with Inorganic Ion Barrier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In light-emitting elements with quantum dots, ions can pass through spaces between charge transport layers, leading to deterioration of the quantum dots when the element is driven.
Innovation Solution
Incorporating a first charge transport layer filled with a first inorganic filler to prevent ion migration from the charge transport layer to the light-emitting layer, using a mixed solution of charge transport materials and an inorganic precursor that is denatured into the filler by heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a charge transport layer is used to transport carriers, then charge transport efficiency is improved, but ion migration to the light-emitting layer causes quantum dot deterioration
Solution Approach 1:
An ion barrier layer is introduced as an intermediary between the charge transport layer and the light-emitting layer. This barrier layer selectively blocks ion migration while allowing carrier transport to continue, thus protecting the quantum dots from deterioration without compromising charge transport efficiency
Solution Approach 2:
The charge transport layer is segmented into two functional layers: a charge transport layer for carrier transport and an ion barrier layer for ion blocking. This segmentation allows each layer to specialize in its respective function, resolving the contradiction between charge transport and ion protection
2Power
If ions are injected into the light-emitting layer during operation, then charge transport is enhanced, but quantum dot deterioration occurs
Solution Approach 1:
The ion barrier layer is positioned in advance to prevent ion injection into the light-emitting layer before deterioration can occur. This preliminary protective action blocks harmful ions while allowing the device to operate with enhanced charge transport
3Speed
If space between charge transport materials is left empty, then charge transport mobility is improved, but ion passage is enabled
Solution Approach 1:
The ion barrier layer introduces different local qualities into the charge transport layer: regions with high charge transport mobility for carrier transport and regions with ion-blocking properties for ion protection. This local differentiation resolves the contradiction between mobility and ion blocking
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
This configuration enhances the efficiency and reliability of the light-emitting element by preventing ion-induced deterioration of quantum dots, thereby improving the element's performance and extending its lifespan.
Implementation Method 1
denaturing the first inorganic precursor into a first inorganic filler by heating the applied mixed solution
Data Source
AI summary
A light-emitting element includes a first electrode, a second electrode, a light-emitting layer being located between the first electrode and the second electrode and including a plurality of quantum dots and a first charge transport layer being located between the first electrode and the light-emitting layer and/or between the second electrode and the light-emitting layer and being in contact with the light-emitting layer. The first charge transport layer includes a plurality of first charge transport materials and a first inorganic filler with which a space between the plurality of first charge transport materials is filled.