Light-Emitting Substrate Electrode Hollows for Injection Balance
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Solution Overview
Problem
Existing self-luminous light-emitting devices face challenges in achieving a balanced injection of electrons and holes into the light-emitting layer, leading to inefficiencies in luminous efficiency and device life due to excessive electron injection.
Innovation Solution
Incorporating a hollow in the first electrode in contact with the first semiconductor layer within the region of the sub-pixel, reducing the effective cross-sectional area for carrier injection and adjusting the balance between electron and hole injection by modifying the electrode's effective width through a third electrode voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first electrode has a large area in contact with the first semiconductor layer, then carrier injection is enhanced, but excessive electron injection occurs leading to poor injection balance
Solution Approach 1:
The first electrode is divided into multiple first tooth-shaped sub-electrodes arranged at intervals, with hollows provided between adjacent sub-electrodes. This segmentation reduces the effective contact area while maintaining multiple injection sites, achieving both sufficient carrier injection and improved injection balance.
Solution Approach 2:
The electrode structure is designed with different characteristics in different regions: the tooth-shaped sub-electrodes provide localized injection sites with controlled spacing, while the hollows between sub-electrodes reduce excessive injection in specific areas. This local differentiation achieves balanced electron and hole injection.
2Reliability
If the first electrode area is reduced to balance injection, then injection balance improves, but carrier injection efficiency decreases
Solution Approach 1:
By segmenting the electrode into multiple tooth-shaped sub-electrodes with hollows between them, the design maintains a reduced effective area for better injection balance while providing multiple distributed injection sites that collectively maintain sufficient carrier injection efficiency.
Solution Approach 2:
The electrode structure transitions from a simple planar configuration to a three-dimensional tooth-shaped arrangement with vertical spacing. This dimensional change allows the electrode to maintain effective injection area through vertical distribution while presenting a reduced planar footprint, achieving both injection balance and efficiency.
3Reliability
If the effective width of the first electrode is adjusted via third electrode voltage, then injection balance is optimized, but device complexity increases
Solution Approach 1:
The third electrode is introduced to dynamically adjust the effective width of the first electrode through voltage control. This dynamic adjustment mechanism allows optimization of injection balance under different operating conditions while maintaining a relatively simple structural addition.
Solution Approach 2:
The third electrode acts as an intermediary element that mediates between the first electrode and the driving circuitry. By controlling the effective width of the first electrode through the third electrode's voltage, the system achieves injection balance optimization without requiring complex direct control mechanisms.
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 approach enhances the balance of electron and hole injection, improving luminous efficiency and extending the life of the light-emitting device by reducing excessive electron injection.
Implementation Method 1
The first electrode is in ohmic contact with the first semiconductor layer
Implementation Method 2
a light-emitting functional layer disposed between the first electrode and the second electrode. The light-emitting functional layer includes a light-emitting layer
Data Source
AI summary
A light-emitting substrate includes a substrate and a plurality of sub-pixels disposed on the substrate. Each sub-pixel includes a light-emitting device; the light-emitting device includes a first electrode and a second electrode, and a light-emitting functional layer disposed between the first electrode and the second electrode the light-emitting functional layer includes a light-emitting layer, a first semiconductor layer disposed between the light-emitting layer and the first electrode and in contact with the first electrode, and a second semiconductor layer disposed between the light-emitting layer and the second electrode. The first electrode is configured to provide carriers for the light-emitting layer. In the light-emitting device, a portion of the first electrode in contact with the first semiconductor layer is provided with a hollow therein, and the hollow is located in a region where a sub-pixel to which the light-emitting device belongs is located.