OLED Constructive Interference via Segmented Reflective Layers
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Solution Overview
Problem
Conventional organic light emitting diodes (OLEDs) suffer from low constructive interference effects due to structural limitations, resulting in poor color quality and efficiency, with attempts to improve color coordinates leading to undesirable degradation in driving voltage, efficiency, and lifetime.
Innovation Solution
An OLED configuration featuring a light-transmitting lower electrode, an organic thin film layer with an emission material layer, a light-transmitting upper electrode, a functional layer for mutual reinforcement and interference of transmitted light, and a reflective layer, with adjustable thicknesses to maximize constructive interference and enhance color quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional OLED structure with a reflective electrode is used, then light reflection is achieved, but constructive interference effects are weak resulting in poor color quality and efficiency
Solution Approach 1:
The reflective electrode is segmented into multiple distinct layers (first reflective layer and second reflective layer) separated by an organic thin film layer. This segmentation creates multiple interfaces for light reflection and interference, enhancing constructive interference effects and improving both color quality and light emission efficiency compared to a single conventional reflective electrode.
Solution Approach 2:
The OLED employs a composite structure combining multiple functional layers with different optical properties: transparent electrodes, organic thin film layers, emission material layers, and reflective layers. This composite material approach allows optimization of light interference patterns while maintaining electrical functionality, resolving the contradiction between color quality and emission efficiency.
2Illumination intensity
If attempts are made to improve color coordinates, then color quality may be enhanced, but driving voltage, efficiency, and lifetime deteriorate
Solution Approach 1:
Different layers in the OLED structure are assigned specific local functions: the organic thin film layer and emission material layer are optimized for light emission and interference properties to improve color coordinates, while the reflective layers and electrode structures are designed to maintain electrical stability and device lifetime. This local quality differentiation allows simultaneous optimization of color quality and reliability.
Solution Approach 2:
The invention optimizes specific structural parameters including the thickness of the organic thin film layer and the arrangement of reflective layers to enhance constructive interference effects. By carefully controlling these physical parameters, the device achieves improved color coordinates without compromising driving voltage, efficiency, or lifetime.
3Illumination intensity
If a top emission type OLED is used, then light transmission area is enlarged resulting in high luminance, but structural complexity increases
Solution Approach 1:
The OLED structure is designed with multi-functionality: the reflective layers serve dual purposes of electrical conduction and optical reflection, while the organic thin film layer simultaneously provides structural support and optical interference enhancement. This multi-functional design achieves high luminance through top emission without proportionally increasing structural complexity.
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 proposed OLED structure achieves high color quality, high luminance, and long lifetime while maintaining a simple manufacturing process and high color reproducibility, with adjustable layer thicknesses optimizing interference effects for improved performance.
Implementation Method 1
a functional layer formed on the upper electrode and enabling mutual reinforcement and interference of transmitted light
Data Source
AI summary
The present invention relates to an organic light emitting diode and a manufacturing method therefor, and the organic light emitting diode comprises: a lower electrode formed on a light-transmitting substrate; an organic thin film layer which is formed on the lower electrode and includes a light-emitting layer; a light-transmitting upper electrode formed on the organic thin film layer; a functional layer which is formed on the upper electrode and enables mutual reinforcement and interference for the transmitted lights; and a reflective layer formed on the functional layer.