Silicon Compound Structure for Organic Electroluminescence Stability
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Solution Overview
Problem
Existing organic electroluminescence elements require improved endurance and stability, as current silane compounds used in these elements do not adequately enhance their longevity.
Innovation Solution
Incorporating specific silicon compounds represented by formulas (1), (3), and (4) into the organic layers of the electroluminescence elements, which include aryl or heteroaryl groups and specific substituents, to form a luminescent layer between electrodes, enhancing the element's stability and endurance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silane compounds are used in organic electroluminescence elements, then the elements can operate at low voltage with high brightness, but the element endurance and stability are insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of silane compounds by introducing specific aryl and heteroaryl groups with defined substituent patterns. Formula (1) specifies particular structural parameters including R11-R16 groups and Ar11-Ar16 groups with formula (2), where m is 0 or 1. These parameter changes in molecular structure enhance the compound's stability and durability in EL elements while maintaining electrical performance.
Solution Approach 2:
The invention creates composite molecular structures by combining silane core compounds with specific aryl/heteroaryl substituents and further composite Ar groups defined by formula (2). This multi-level composite structure (silane + aryl groups + substituted Ar groups) produces materials with enhanced reliability and endurance properties that individual components cannot achieve alone.
2Reliability
If existing silane compounds are used, then the organic electroluminescence elements can be manufactured with current processes, but the storage stability and driving endurance are not sufficiently improved
Solution Approach 1:
The patent specifies precise structural parameters in formula (1) and formula (2) that optimize storage stability. The defined substituent patterns (R21-R24 as substituents or H, L2 as specific linkers, m as 0 or 1) create molecules with enhanced chemical stability and resistance to degradation, improving storage life without requiring fundamentally new manufacturing processes.
Solution Approach 2:
The complex silane compound structure is segmented into manageable functional units: the core silane group, aryl/heteroaryl substituents (R11-R16), and composite Ar groups (Ar11-Ar16 following formula 2). This segmentation allows systematic synthesis and quality control, making the enhanced stability compounds manufacturable with adapted but not entirely new processes.
3Duration of action of moving object
If conventional compounds are used in the luminescent layer, then the element structure remains simple, but the half-value period of luminance under constant electric current is limited
Solution Approach 1:
The patent changes the molecular parameters of compounds in the luminescent layer by specifying formula (1) with particular R groups and nested formula (2) structures. These parameter changes enhance the compound's resistance to electrical degradation and maintain luminance output over extended periods, extending the half-value period under constant current operation.
Solution Approach 2:
The luminescent layer incorporates composite silane compounds with multiple functional groups working synergistically. The nested structure where Ar11-Ar16 groups follow formula (2) creates a composite material system that resists degradation better than simple compounds, extending operational duration while the overall layer structure remains manageable.
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 use of these silicon compounds significantly improves the endurance and stability of the organic electroluminescence elements, leading to enhanced driving endurance and storage stability, with specific examples demonstrating improved half-value periods of luminance under constant electric current.
Implementation Method 1
an organic electroluminescence element capable of converting electric energy to light, so as to emit light
Data Source
AI summary
An organic electroluminescence element, which contains at least one organic layer that includes a luminescent layer between a pair of electrodes, wherein the organic layer contains at least one compound represented by formula (1):wherein R11 and R12 each independently represent an aryl or heteroaryl group; when R11 or R12 is a phenyl group, it has no nitrogen-containing heterocyclic group on R11 or R12 as a substituent; Ar11 and Ar12 each independently represent a group represented by formula (2):wherein Ar21 represents an arylene or heteroarylene group; R21, R22, R23, and R24 each independently represent a substituent or a hydrogen atom; L2 represents a substituted or unsubstituted o-arylene or vinylene group, —NR— (R represents a substituent), —O—, or —S—; and m is 0 or 1.