Organic Device Insulating Layer Slope for Crosstalk Suppression
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Solution Overview
Problem
Existing organic devices with tandem elements face challenges in suppressing crosstalk, which leads to reduced resolution and efficiency due to current leaks between adjacent elements.
Innovation Solution
The organic device incorporates a substrate with a first and second electrode, an insulating layer with specific slope portions, an organic layer with multiple function layers and a charge generating layer, and a third electrode. The insulating layer's slope portions are designed to reduce leakage current by controlling the film thickness of the charge generating and organic layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a tandem element is used to improve light emission efficiency, then light emission efficiency is improved, but crosstalk occurs due to current leaks between adjacent elements
Solution Approach 1:
The insulating layer is designed with a slope portion having a specific angle (50° to 180°) only in the region between adjacent electrodes, while maintaining other structural characteristics. This localized structural modification creates higher electrical resistance at the interface without affecting the overall tandem element configuration, thereby suppressing crosstalk while preserving light emission efficiency
Solution Approach 2:
The insulating layer is extended in the vertical dimension to form a slope portion that protrudes between adjacent electrodes. This three-dimensional structure creates an additional insulation barrier in the vertical direction, effectively blocking current leakage paths between elements while maintaining the horizontal arrangement of the tandem element
2Reliability
If partition walls are dented to suppress crosstalk, then crosstalk is suppressed, but device complexity increases
Solution Approach 1:
Instead of modifying the geometric shape of partition walls through denting, the invention changes the electrical parameter (resistance) by forming a slope portion in the insulating layer with a specific angle range (50° to 180°). This parameter-based approach achieves crosstalk suppression through electrical property optimization rather than complex structural modification
Solution Approach 2:
The invention extracts the crosstalk suppression function from the partition wall structure and assigns it to the insulating layer. By forming a slope portion in the insulating layer that protrudes between adjacent electrodes, the suppression function is separated from the partition wall, simplifying the overall device structure while maintaining effectiveness
Data Source
AI summary
An organic device comprising first and second electrodes above a main surface of a substrate, an insulator which includes a first portion arranged between the first and second electrodes and a second portion arranged to cover a peripheral portion of the first electrode and an organic layer is provided. An upper surface of the insulator which is between a vertex portion of the second portion and at least one of a third portion of the first electrode which is not covered by the insulator and the first portion includes a slope portion having angle 50° to 180° with respect to the main surface. An upper end of the slope portion is farther from the main surface than an upper surface of a charge generating layer of the organic layer, and is closer to the main surface than an upper surface of the organic layer.