Light-Emitting Element With Cross-Linked Polymer Layer
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Solution Overview
Problem
Current light-emitting devices face challenges in achieving high external quantum efficiency, which is essential for optimal performance in display and illumination applications.
Innovation Solution
A light-emitting device is designed with a specific configuration, including an anode, a cathode, a first organic layer containing a fluorescent low-molecular compound with a maximum peak wavelength of 380 nm to 750 nm, and a second organic layer in a cross-linked form of a polymer compound with a cross-linking constitutional unit, where the cross-linking groups are strategically incorporated to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic layers with polymers are used, then device structure is established, but external quantum efficiency is insufficient
Solution Approach 1:
The patent employs composite materials by combining a fluorescent low-molecular compound (formula 1) with a polymer compound (formula 2) having cross-linking groups. This composite organic layer integrates the high efficiency of low-molecular fluorescent compounds with the structural stability of cross-linked polymers, achieving both improved external quantum efficiency and reliable device performance
Solution Approach 2:
The patent changes the chemical and physical parameters of the organic layer by introducing specific cross-linking groups ( formulas 3-6) into the polymer structure. These parameter changes in molecular weight, cross-linking density, and chemical composition optimize the energy utilization and emit- tion characteristics, directly improving external quantum efficiency while maintaining device reliability
2Stability of the object's composition
If polymer compounds with cross-linking groups are used, then structural stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-designing the polymer compound with built-in cross-linking groups (formulas 3-6) during synthesis. This preliminary incorporation of cross-linking functionality eliminates the need for separate cross-linking steps, maintaining ease of manufacture while achieving the desired structural stability in the organic layer
Solution Approach 2:
The patent applies local quality by introducing cross-linking groups at specific positions within the polymer structure (formulas 3-6). This localized incorporation of cross-linking functionality provides structural stability exactly where needed in the organic layer, while keeping the overall manufacturing process simple and straightforward
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 device achieves improved external quantum efficiency, leading to better performance in light emission and energy utilization.
Implementation Method 1
a first organic layer which is a layer containing a fluorescent low-molecular compound
Data Source
AI summary
Provided is a light-emitting device comprising: an anode; a cathode; a first organic layer disposed between the anode and the cathode; and a second organic layer disposed, adjacently to the first organic layer, between the anode and the cathode, wherein: the first organic layer is a layer containing a fluorescent low-molecular compound; the second organic layer is a layer containing a cross-linked form of a polymer compound comprising a cross-linking constitutional unit having a cross-linking group; and the average number of cross-linking groups per molecular weight 1000 in the polymer compound is 0.60 or more.