Quantum Dot LED Hole Transport Layer Patterning for Color Purity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The light-emitting performance of quantum dot light-emitting elements needs improvement due to issues with residual quantum dot material outside target regions during photolithography, affecting color purity and electrical performance.
Innovation Solution
A light-emitting element with a first hole transport layer and a second hole transport layer, where the first layer has higher hole mobility than the second, and the second layer includes photosensitive groups for precise patterning through photolithography, removing residual light-emitting material and improving electrical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single hole transport layer is used with photolithography patterning, then manufacturing precision is improved, but residual light-emitting material remains outside target regions affecting color purity
Solution Approach 1:
The patent divides the hole transport function into two separate layers: a first hole transport layer for charge transport and a second hole transport layer for patterning protection. This segmentation allows the second layer to be precisely patterned via photolithography while the first layer maintains high hole mobility, preventing residual material contamination without compromising electrical performance.
Solution Approach 2:
The second hole transport layer acts as an intermediary between the light-emitting layer and the patterned region. It serves as a protective barrier that prevents residual light-emitting material from contaminating areas outside the target region during photolithography, while still allowing the first hole transport layer to perform its charge transport function effectively.
2Reliability
If hole mobility is increased to improve electrical performance, then device reliability is improved, but driving voltage increases affecting service life
Solution Approach 1:
The patent applies different material properties to different layers: the first hole transport layer uses materials with high hole mobility to ensure excellent electrical performance and reliability, while the second hole transport layer uses materials optimized for photolithography patterning and protective functions. This local optimization allows each layer to perform its specific function at peak efficiency without compromising overall device service life.
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 solution enhances the accuracy of light-emitting element display, improves contrast, reduces driving voltage, and increases service life by effectively patterning the second hole transport layer and optimizing hole mobility.
Implementation Method 1
exposing a first target region to excite the photosensitive reactant within the first target region into a plurality of photosensitive groups that crosslink the second hole transport material host
Data Source
AI summary
The present application discloses a light-emitting element, a fabrication method for a light-emitting element, and a quantum dot display panel. The light-emitting element includes a light-emitting layer, a first hole transport layer, and a second hole transport layer, where the first hole transport layer is disposed at a side of the light-emitting layer; and the second hole transport layer is disposed between the first hole transport layer and the light-emitting layer, the second hole transport layer including a second hole transport material host and a plurality of photosensitive groups that crosslink the second hole transport material host, with a hole mobility of the first hole transport layer being greater than that of the second hole transport layer. The light-emitting element according to the present application exhibits good light-emitting performance.