Organic Light-Emitting Device Microcavity Resonance Stabilization
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Solution Overview
Problem
Organic light-emitting devices with microcavity structures face challenges in achieving stable emission characteristics due to sensitivity to film thickness variations, leading to difficulties in producing devices with consistent reproducibility and high production throughput.
Innovation Solution
A thin organic light-emitting device is designed with a substrate, first and second electrodes, and a first sealing layer on the light extraction side, where the optical distance between reflective surfaces forms a resonator structure, utilizing a refractive index difference between sealing layers to reduce the resonance effect and stabilize emission characteristics, allowing for effective adjustment of emission characteristics with minimal impact from film thickness fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a microcavity structure is formed in an organic light-emitting device to improve light extraction efficiency and achieve desired emission chromaticity, then emission characteristics can be adjusted, but the device becomes highly sensitive to film thickness variations, reducing manufacturing precision and reproducibility
Solution Approach 1:
The patent changes the optical parameters of the device by introducing a resin layer with specific refractive index between the organic compound layer and the sealing layer. This parameter change modifies the optical path and resonance conditions, allowing adjustment of emission characteristics while reducing sensitivity to film thickness variations, thereby resolving the contradiction between emission quality and manufacturing precision
Solution Approach 2:
The resin layer acts as an intermediary component between the organic compound layer and the sealing layer. This intermediate layer with controlled refractive index serves as an optical buffer that decouples the strong coupling between the microcavity resonance and film thickness, enabling stable emission characteristics even with thickness variations
2Reliability
If multiple sealing layers with different refractive indices are stacked to form a sealing structure, then moisture and oxygen protection is improved, but the device complexity and number of layers increase
Solution Approach 1:
The resin layer serves multiple functions simultaneously: it provides moisture and oxygen barrier protection like traditional sealing layers, adjusts optical parameters for emission control, and reduces sensitivity to thickness variations. This multi-functionality allows the system to achieve protection and optical control with a single layer rather than requiring separate sealing and optical adjustment layers
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 results in an organic light-emitting device with stable and consistent emission characteristics, reduced sensitivity to film thickness variations, and increased production throughput, enabling the creation of reliable and efficient display apparatus.
Implementation Method 1
an optical distance between a first reflective surface located on a substrate side relative to an organic compound layer and a second reflective surface located on a sealing layer side relative to the organic compound layer is adjusted so as to form a resonance portion of a resonator structure causing resonance of light emitted from the organic compound layer
Implementation Method 2
utilizing a refractive index difference between sealing layers to reduce the resonance effect and stabilize emission characteristics
Data Source
AI summary
Provided is a thin organic light-emitting device which exhibits satisfactory emission characteristics and is hardly affected by film thickness fluctuation in individual layers and exhibits stable emission characteristics and which includes a substrate, a first electrode provided on the substrate, an organic compound layer provided on the first electrode, a second electrode provided on the organic compound layer, and a first sealing layer provided on the light extraction side of the second electrode, in which an optical distance between a first reflective surface located on the substrate side and a second reflective surface located on the sealing layer side is adjusted so as to form a resonance portion of a resonator structure for resonating light emitted from the organic compound layer, and in which the second reflective layer is an interface on the light extraction side of the first sealing layer.