Auxiliary Electrode Pattern for OLED Charge Carrier Control
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Solution Overview
Problem
The voltage limitations in organic light emitting devices restrict the injection and emission of charge carriers, affecting the device's light emitting performance, which is dependent on the material and structure used.
Innovation Solution
Incorporating an auxiliary electrode pattern with insulation layers, allowing for controlled voltage application that expands or reduces the depletion layer in the organic layer, thereby managing the charge carrier movement and light emission independently of the device's material and structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If voltage is increased to improve charge carrier injection and light emission, then light emitting performance is improved, but material and structure limitations cause device reliability to deteriorate
Solution Approach 1:
The device is segmented into multiple functional regions by introducing an auxiliary electrode that divides the organic layer into first and second organic layers. This segmentation allows independent control of charge carrier injection at different locations, enabling improved light emission without exceeding the voltage tolerance of any single region.
Solution Approach 2:
The auxiliary electrode acts as an intermediary element between the first and second electrodes, providing an additional pathway for charge carrier injection. This mediator enables controlled expansion of the depletion layer and facilitates charge carrier movement without requiring excessive voltage that would damage the device structure.
2Reliability
If voltage is limited to maintain device reliability, then device stability is maintained, but charge carrier injection and light emission are restricted
Solution Approach 1:
By segmenting the charge injection function across multiple electrodes (first electrode, auxiliary electrode, second electrode), the device can achieve higher total charge carrier injection without requiring any single electrode to operate at damaging voltage levels.
Solution Approach 2:
The auxiliary electrode is positioned within the organic layer at a different spatial dimension than the conventional planar electrode configuration. This three-dimensional arrangement creates additional injection pathways and expands the depletion layer volume, increasing charge carrier injection capacity without increasing voltage stress on any single interface.
3Measurement precision
If auxiliary electrode is added to control charge carrier movement, then charge carrier control precision is improved, but device structure complexity increases
Solution Approach 1:
The auxiliary electrode serves multiple functions simultaneously: it controls charge carrier injection, expands the depletion layer, and enables independent voltage control of different organic layer regions. This multi-functionality justifies the additional structural element by providing several control mechanisms in one component.
Solution Approach 2:
The auxiliary electrode enables local quality control by allowing different voltage conditions to be applied to different regions of the organic layer. This localized control precision improves charge carrier management without requiring complex global control systems.
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 enables precise control over charge carrier movement and light emission, enhancing the device's performance by preventing leakage current and optimizing light emitting properties without increasing operational voltage.
Implementation Method 1
allowing for controlled voltage application that expands or reduces the depletion layer in the organic layer, thereby managing the charge carrier movement
Implementation Method 2
When an electron and a hole are re-coupled in a certain molecule, a molecule exciton may be formed in a highly excited state. When the molecule exciton returns to a ground state with low energy it may emit its own unique light.
Data Source
AI summary
An organic light emitting device includes a substrate, a first electrode disposed on the substrate, a first organic layer pattern disposed on the first electrode, an auxiliary electrode pattern alternately disposed with the first organic layer pattern, and including an upper insulation layer, a lower insulation layer, and an auxiliary electrode disposed therebetween, a light emitting layer disposed on the first organic layer pattern and the auxiliary electrode pattern, a second organic layer disposed on the light emitting layer and a second electrode disposed on the second organic layer.