Organic EL Element Heat Resistance via Substituent Groups
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Solution Overview
Problem
Organic electroluminescence elements face challenges in maintaining high luminous efficiency and longevity under high temperature conditions, which affects their heat resistance and display characteristics.
Innovation Solution
Incorporating specific organic materials represented by general formulas (1) and (2) into the multilayer structure of the organic light emitting functional layer, particularly in the hole transport layer, which includes substituent groups such as phenyl, naphthyl, and anthracenyl groups, and organic compound groups of silicon, germanium, or tin, to enhance heat resistance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional organic materials are used in the organic light emitting functional layer, then the element can operate at room temperature with basic luminescence, but the luminous efficiency deteriorates rapidly under high temperature conditions
Solution Approach 1:
The patent modifies the chemical structure of organic materials by introducing specific substituent groups (phenyl, naphthyl, anthracenyl groups with silicon, germanium, or tin atoms) to change the thermal and electrical parameters of the material, enabling it to maintain stable luminous efficiency at elevated temperatures up to 80°C
Solution Approach 2:
The patent creates composite organic materials by combining multiple substituent groups containing different 14th group elements (Si, Ge, Sn) with aromatic hydrocarbon backbones, forming a multilayer structure in the organic light emitting functional layer that synergistically improves heat resistance and luminous efficiency stability
2Duration of action of stationary object
If the organic light emitting functional layer uses simple material structures, then the manufacturing process is simpler, but the element lifespan is reduced under high temperature conditions
Solution Approach 1:
The patent introduces specific functional groups (phenyl, naphthyl, anthracenyl with 14th group elements) at particular positions within the organic material molecules to locally enhance thermal stability and charge transport properties, thereby extending element lifespan without requiring complete restructuring of the entire material system
Solution Approach 2:
The patent divides the organic light emitting functional layer into multiple sub-layers, each containing organic materials with specific substituent groups tailored for particular functions (hole injection, hole transport, electron transport, light emission), allowing optimization of each layer's properties to collectively extend overall element lifespan
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 enables the organic electroluminescence element to sustain high luminous efficiency and extend its lifespan even under high temperature conditions, thereby improving heat resistance and display device characteristics.
Implementation Method 1
An organic electroluminescence element (so-called organic EL element) utilizing electroluminescence of an organic material
Data Source
AI summary
An organic electroluminescence element that includes a pair of electrodes and an organic light emitting functional layer. The organic light emitting functional layer being a multilayer structure made of an organic material between the pair of electrodes, and containing at least one of a material represented by the general formula (1), and a material represented by the general formula (2) in the multilayer structure, where general formula (1) and general formula (2) are: