OLED Luminescent Efficiency Improvement Layer
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Solution Overview
Problem
Organic light-emitting devices (OLEDs) face limitations in luminescent efficiency due to internal and external light coupling inefficiencies, particularly in extracting light generated in organic layers.
Innovation Solution
Incorporation of a luminescent efficiency improvement layer containing a condensed-cyclic compound, represented by Formula 1, on the electrodes of OLEDs to enhance light extraction through constructive interference, improving external luminescent efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a typical OLED structure with organic thin films is used, then the device can provide multicolored images with wide viewing angle and high brightness, but external luminescent efficiency is limited due to light coupling inefficiency
Solution Approach 1:
The patent introduces a luminescent efficiency improvement layer as an intermediary component between the organic light-emitting layer and the electrode. This layer contains condensed-cyclic compounds that act as mediators to enhance light extraction by reducing total internal reflection at the interface, thereby improving external luminescent efficiency without compromising the brightness and color properties of the OLED
Solution Approach 2:
The patent modifies the optical parameters at the interface between the organic layer and electrode by introducing the luminescent efficiency improvement layer with specific refractive index properties. This parameter change reduces the refractive index mismatch and minimizes total internal reflection, enabling more efficient light extraction while maintaining the device's brightness characteristics
2Speed
If organic thin films are used in the OLED structure, then the device achieves excellent contrast and quick response, but internal luminescent efficiency is influenced by inefficient exciton conversion in the organic layers
Solution Approach 1:
The luminescent efficiency improvement layer serves as an intermediary that enhances the overall luminescent efficiency of the OLED by improving light extraction from the organic layers. This layer contains condensed-cyclic compounds that facilitate better optical coupling and reduce energy loss through total internal reflection, thereby improving internal luminescent efficiency without affecting the quick response characteristics of the organic thin films
3Adaptability or versatility
If light is generated in the organic layers between electrodes, then the OLED achieves self-emission with wide viewing angle, but light extraction is limited by total internal reflection at the interfaces
Solution Approach 1:
The patent introduces a luminescent efficiency improvement layer as an intermediary component that specifically addresses the light extraction problem. This layer contains condensed-cyclic compounds that reduce total internal reflection at the interface between the organic layer and electrode, enabling more efficient light extraction while preserving the wide viewing angle characteristics inherent to OLED technology
Solution Approach 2:
The patent applies the luminescent efficiency improvement layer locally at the interface between the organic light-emitting layer and the electrode. This localized application targets the specific region where total internal reflection occurs most strongly, improving light extraction efficiency at the critical interface without affecting the overall wide viewing angle and self-emission properties of the OLED
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
Significantly enhances luminescent efficiency of OLEDs by increasing light transmission and reducing total reflection, leading to improved external luminescent efficiency and overall performance.
Implementation Method 1
enhance light extraction through constructive interference
Implementation Method 2
reducing total reflection
Data Source
AI summary
An organic light-emitting device including a substrate; a first electrode on the substrate, the first electrode including a first surface and a second surface opposite to the first surface; an organic layer on the first electrode, the organic layer being adjacent to the first surface of the first electrode; a second electrode on the organic layer, the second electrode including a first surface adjacent to the organic layer and a second surface opposite to the first surface; and a luminescent efficiency improvement layer on at least one of the second surface of the first electrode and the second surface of the second electrode, the luminescent efficiency improvement layer including a condensed-cyclic compound represented by Formula 1, below: