Light-Emitting Element Third Electrode Carrier Injection
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Solution Overview
Problem
In multilayer light-emitting elements, carriers are trapped in interface states between layers, reducing efficiency in carrier injection into the light-emitting layer.
Innovation Solution
A light-emitting element with a specific structure including a first electrode, a second electrode, a light-emitting layer, and a third electrode positioned within an insulator, which applies an electric field to release carriers trapped in interface states, improving injection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a multilayer light-emitting element structure is used, then light emission function is achieved, but carrier injection efficiency is reduced due to interface states
Solution Approach 1:
A third electrode is introduced as an intermediary component positioned between the light-emitting layer and the insulator. This third electrode serves as a mediator to extract trapped carriers from interface states through application of an extraction voltage, thereby resolving the carrier injection efficiency problem without disrupting the multilayer light-emitting structure
Solution Approach 2:
The insulator is divided into a first portion and a second portion, with the third electrode positioned in the first portion. This segmentation allows the insulator to serve multiple functions: electrical isolation and carrier extraction, while maintaining the overall multilayer structure's light emission capability
2Stability of the object's composition
If carriers are trapped in interface states, then layer structure stability is maintained, but light emission efficiency is reduced
Solution Approach 1:
The third electrode acts as an intermediary extraction mechanism that removes trapped carriers from interface states without disrupting the stable multilayer structure. By applying extraction voltage to this intermediary electrode, carriers are released back into the light-emitting layer, improving light emission efficiency while preserving structural stability
Solution Approach 2:
The system utilizes parameter changes in electrical potential by applying different voltages: driving voltage for carrier injection and extraction voltage for carrier release. This parameter modulation allows dynamic control of carrier populations in the light-emitting layer without altering the physical structure, thereby maintaining stability while optimizing emission 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 solution effectively releases carriers from interface states, enhancing light emission efficiency and reducing power consumption and device lifespan.
Implementation Method 1
a third electrode included in the first insulator, and positioned so that a first portion of the first insulator is sandwiched between the third electrode and the first side surface of the light-emitting layer
Data Source
AI summary
A light-emitting element includes: a first electrode serving as an anode; a second electrode serving a cathode; a light-emitting layer; a first insulator; and a third electrode. The light-emitting layer is positioned between the first electrode and the second electrode, and the first insulator is positioned toward the first side surface of the light-emitting layer with respect to the light-emitting layer. The third electrode is included in the first insulator, and positioned so that a first portion of the first insulator is sandwiched between the third electrode and the first side surface of the light-emitting layer.