Silicon Compound Light Extraction Sheet for Organic EL
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Solution Overview
Problem
Conventional organic electroluminescence elements face challenges in achieving high light extraction efficiency due to total reflection at the interface between the flat surface and air, and existing solutions like light-diffusing sheets lack weather resistance, especially for outdoor applications.
Innovation Solution
An organic electroluminescence element with a light extraction sheet containing a silicon compound, having a haze value of 90 or more and total light transmittance of 80% or more, is integrated to enhance both light extraction efficiency and weather resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light-diffusing sheet is used to improve light extraction efficiency, then light extraction efficiency is improved, but weather resistance deteriorates
Solution Approach 1:
The patent uses a composite light extraction sheet comprising a base sheet and a light extraction layer containing silicon oxide particles dispersed in a transparent resin. This composite structure combines the optical properties needed for light extraction with the durability of weather-resistant materials, resolving the contradiction between light extraction efficiency and weather resistance
Solution Approach 2:
The light extraction layer contains silicon oxide particles that create a porous or particulate structure within the transparent resin matrix. This structure enhances light scattering and extraction efficiency while the resin matrix provides weather protection, simultaneously achieving both improved light extraction and maintained weather resistance
2Loss of energy
If the light extraction sheet has high haze value to improve light extraction efficiency, then light extraction efficiency is improved, but total light transmittance decreases
Solution Approach 1:
The patent optimizes the parameters of the light extraction layer including the haze value (set to 90% or more), total light transmittance (set to 80% or more), thickness (10-100 μm), and silicon oxide particle concentration. By carefully controlling these parameters, the invention achieves high light extraction efficiency through scattering while maintaining sufficient total light transmittance for practical applications
Solution Approach 2:
The light extraction layer is designed with specific local properties: a thin thickness range (10-100 μm) that provides adequate scattering function while minimizing light absorption, and controlled particle distribution that enhances haze locally without excessively reducing overall transmittance. This localized optimization resolves the contradiction between haze and transmittance
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 provides an organic electroluminescence element with improved light extraction efficiency and weather resistance, effectively addressing the limitations of existing technologies by using a silicon compound-based light extraction sheet.
Implementation Method 1
the light extraction sheet contains a silicon compound, the haze value of the light extraction sheet is 90 or more
Implementation Method 2
an organic electroluminescence element (hereinafter, referred to as organic EL element), which emits light by supplying electric energy to a light-emitting layer formed of an organic material from respective positive and negative electrodes
Implementation Method 3
light emitted from the light-emitting layer (hereinafter, referred to as emitted light) passes through the first electrode and the transparent substrate
Data Source
AI summary
Provided is an organic EL element having both excellent light extraction efficiency and excellent weather resistance. The organic EL element (10) has a configuration comprising: an organic EL element main body (1) including an organic compound layer (13) including a light-emitting layer; and a light extraction sheet (2) provided on the light-extraction side of the organic EL element main body (1). In addition, the organic EL element (10) is characterized by: the light extraction sheet (2) including a silicon compound; the haze value of the light extraction sheet (2) being at least 90; and the total light transmittance of the light extraction sheet (2) being at least 80%.