Organic Electronic Substrate with Sintered Functional Layer
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Solution Overview
Problem
Conventional organic electronic devices (OEDs) face inefficiencies in light extraction due to total internal reflection at the interface between the organic layer and the substrate, leading to trapped light and reduced emission.
Innovation Solution
A substrate with a functional layer comprising a sintered glass frit and scattering particles is used, which has a refractive index similar to the glass substrate, combined with a high refractive layer or electrode layer to effectively scatter, refract, and diffract light, improving light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional glass substrate with standard refractive index is used, then the device structure is simple, but light extraction efficiency is poor due to total internal reflection at interfaces
Solution Approach 1:
The patent applies composite materials by creating a functional layer that combines glass frit particles with scattering particles (such as TiO2, SiO2, or ZrO2). This composite structure allows the substrate to simultaneously maintain structural integrity and optical properties that reduce total internal reflection. The scattering particles dispersed within the glass frit matrix create refractive index variations that enhance light extraction while keeping the overall substrate composition based on conventional glass materials.
Solution Approach 2:
The patent changes the refractive index parameter of the substrate by incorporating scattering particles with high refractive indices (TiO2: 2.6-2.9, SiO2: 1.46, ZrO2: 2.1-2.6) into the glass frit matrix. This parameter modification creates refractive index differences at the interfaces, reducing total internal reflection and improving light extraction efficiency without fundamentally changing the substrate manufacturing process.
2Loss of energy
If a functional layer with scattering particles is added to improve light extraction, then light extraction efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges the substrate and the light extraction enhancement function into a single integrated functional layer. Rather than adding a separate scattering layer on top of the substrate, the scattering particles are incorporated directly into the glass frit matrix during substrate formation. This combining approach improves light extraction while minimizing structural complexity and maintaining compatibility with conventional manufacturing processes.
Solution Approach 2:
The functional layer serves multiple functions simultaneously: it provides the structural base for the device, acts as the substrate support, and functions as the light extraction enhancement layer through its embedded scattering particles. This multi-functionality reduces the need for additional separate layers, thereby improving light extraction efficiency without proportionally increasing device complexity.
3Strength
If glass frit is sintered to form the functional layer, then cohesive strength improves, but manufacturing process complexity increases
Solution Approach 1:
The patent utilizes the sintering process to transform the glass frit from a loose particulate state to a dense, cohesive solid matrix. By controlling sintering parameters (temperature, time, atmosphere), the process achieves strong bonding between glass frit particles and scattering particles, creating a mechanically robust functional layer. This parameter-controlled transformation improves cohesive strength while maintaining process simplicity through established ceramic processing techniques.
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 substrate enhances light extraction efficiency and stability of the OED by minimizing light trapping and increasing cohesive strength, thereby improving the overall performance of the device.
Implementation Method 1
a layer (hereinafter, referred to as simply a 'functional layer') including a sintered product of a glass frit and scattering particles present therein, which is formed on the glass substrate... the functional layer may serve to scatter, diffract or refract incident light
Implementation Method 2
the functional layer may serve to scatter, diffract or refract incident light
Implementation Method 3
the functional layer may serve to scatter, diffract or refract incident light
Implementation Method 4
a layer (hereinafter, referred to as simply a 'functional layer') including a sintered product of a glass frit and scattering particles present therein, which is formed on the glass substrate
Data Source
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AI summary
Provided are a substrate for an organic electronic device, and the like. The substrate for an organic electronic device having a functional layer which may improve a function such as light extraction efficiency of an organic electronic system such as organic light emitting device and stability of the device due to excellent cohesive strength to the substrate may be provided. An organic electronic system including the substrate and a use thereof may also be provided.