Quantum Dot Light-Emitting Element With Gap-Filling Second Dots
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Carrier injection into quantum dots in light-emitting elements is hindered by insulating films, leading to degraded light emission efficiency.
Innovation Solution
A light-emitting element configuration with a quantum dot layer containing first quantum dots and a space with second quantum dots of smaller particle diameter, positioned between electrodes, enhancing carrier injection and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating film is used to fill the gap between quantum dots, then current concentration is improved, but carrier injection is hindered and light emission efficiency is degraded
Solution Approach 1:
The patent changes the material parameter of the gap-filling substance from insulating material to quantum dots with specific energy levels. This parameter change transforms the gap-filling function from current blocking to carrier transport, resolving the contradiction by enabling both current concentration and efficient carrier injection simultaneously.
Solution Approach 2:
The patent applies local quality by creating different quantum dot regions: first quantum dots for light emission and second quantum dots for carrier injection. The second quantum dots are specifically positioned in the gap region to provide localized carrier transport pathways, allowing current concentration to be maintained while eliminating the insulating barrier effect.
2Ease of manufacture
If the quantum dot layer contains only uniform quantum dots, then manufacturing is simplified, but carrier injection efficiency is reduced due to current concentration in gaps
Solution Approach 1:
The patent introduces local quality differentiation within the quantum dot layer by incorporating second quantum dots specifically in the gap regions between first quantum dots. This localized modification improves carrier injection efficiency without requiring complete redesign of the entire quantum dot layer, thus maintaining relative manufacturing simplicity while solving the carrier injection problem.
Solution Approach 2:
The patent creates a composite quantum dot structure combining two types of quantum dots with different functions: first quantum dots for light emission and second quantum dots for carrier injection. This composite approach allows the system to achieve both good light emission properties and efficient carrier injection, resolving the contradiction between manufacturing simplicity and injection efficiency.
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 configuration enhances light emission efficiency by improving carrier injection and reducing leakage current, while also enhancing color purity and reducing power consumption.
Implementation Method 1
a quantum dot layer disposed between the first electrode and the second electrode, and including first quantum dots
Implementation Method 2
the space contains second quantum dots having a smaller particle diameter than the first quantum dots
Data Source
AI summary
A light-emitting element is provided with the following: a first electrode and a second electrode; and a quantum dot layer disposed between the first electrode and the second electrode, and including first quantum dots. The quantum dot layer includes a space absent from the first quantum dots penetrating the quantum dot layer in a thickness direction of the quantum dot layer. The space contains second quantum dots having a smaller particle diameter than the first quantum dots.