Top Emission OLED Light Emission Efficiency Optimization
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Solution Overview
Problem
Current organic electroluminescent devices lack a systematic approach to combining material species and device structures, making it difficult to predict and achieve high light emission efficiency, as the performance of materials and structures is often evaluated in isolation rather than in combination.
Innovation Solution
A top emission type organic electroluminescent device is designed with a lamination structure including a substrate, a first electrode, a light emitting layer, and a transparent second electrode, where the light emitting layer contains specific organic compounds that satisfy certain energy and spectral conditions, including a delayed fluorescent material and compounds with controlled S values and full width at half maximum, to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If material species and device structure are evaluated in isolation, then individual component performance can be optimized, but the overall light emission efficiency of the device cannot be predicted or improved
Solution Approach 1:
The patent combines material species selection with device structure design into a unified evaluation framework. By integrating the evaluation of organic compounds (host, dopant, and guest materials) with the top emission device structure, the patent enables prediction of overall light emission efficiency that cannot be achieved when evaluating materials and structures separately.
2Adaptability or versatility
If specific material species are used in non-proposed device structures, then device structure flexibility is improved, but light emission efficiency cannot be guaranteed
Solution Approach 1:
The patent establishes specific parameter criteria for material selection including HOMO-LUMO energy levels, triplet energy levels, and concentration ratios. By defining these parameters and their relationships, the patent enables flexible device structure design while guaranteeing light emission efficiency through quantitative control of material properties rather than relying on fixed structural proposals.
3Reliability
If material combinations are tested experimentally to achieve high light emission efficiency, then device performance can be optimized, but development time and cost increase
Solution Approach 1:
The patent performs preliminary theoretical evaluation of material combinations by establishing energy level matching criteria and concentration optimization rules before actual device fabrication. By pre-screening material combinations based on HOMO-LUMO levels, triplet energies, and predicted emission characteristics, the patent reduces the need for extensive experimental trial-and-error, thereby shortening development time while ensuring high light emission efficiency.
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 solution allows for high light emission efficiency and accurate evaluation of light emission capability, enabling the design of excellent organic electroluminescent devices with improved performance by optimizing the combination of material species and device structures.
Implementation Method 1
the second organic compound being a delayed fluorescent material
Implementation Method 2
the second organic compound being a delayed fluorescent material
Implementation Method 3
recombination of a hole and an electron occurs in the light emitting layer
Data Source
AI summary
A top emission type organic electroluminescent device including a light emitting layer containing first to third organic compounds, in which the second organic compound is a delayed fluorescent material having lower ES1 than the first organic compound, and the third organic compound has the lowest ES1 and higher ELUMO and EHOMO than the second organic compound and has a S value of −0.38 or less and a full width at half maximum of 31 nm or less, has a high light emission efficiency.