Crosslinked Organic Light-Emitting Layers for Higher Emission Efficiency
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Solution Overview
Problem
Existing light emitting devices, such as organic electroluminescent devices, suffer from insufficient light emission efficiency.
Innovation Solution
A light emitting device comprising a cathode, a first organic layer with a compound having a cross-linkable group and a phosphorescent transition metal complex, and a second organic layer with a crosslinked body of the same compound, where the compound's cross-linkable group is present in a ratio of 2 to 10% by mass in the first organic layer, enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional organic electroluminescent device structure is used, then the device can be manufactured with standard materials and processes, but the light emission efficiency is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the organic layers by incorporating compounds with cross-linkable groups (at 2-10% by mass) and phosphorescent transition metal complexes, transforming the material properties to achieve higher light emission efficiency while maintaining device reliability
Solution Approach 2:
The patent creates composite organic layers by combining multiple components: compounds with cross-linkable groups, phosphorescent transition metal complexes, and other organic materials. This composite structure enables both improved light emission efficiency and sufficient device performance that conventional single-material layers cannot achieve
2Use of energy by moving object
If the first organic layer contains compound with cross-linkable group and phosphorescent transition metal complex at 2-10% by mass, then light emission efficiency is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The patent establishes a specific mass ratio range (2-10%) for the compound with cross-linkable group in the first organic layer, optimizing this parameter to achieve high light emission efficiency while keeping the manufacturing precision requirement within feasible limits for industrial production
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 light emission efficiency through the specific composition and structure of the organic layers, specifically utilizing cross-linkable groups and phosphorescent transition metal complexes.
Implementation Method 1
a first organic layer containing a compound having a cross-linkable group and a phosphorescent transition metal complex
Implementation Method 2
a second organic layer containing a crosslinked body of the same compound as the compound having a cross-linkable group
Data Source
AI summary
A light emitting device having excellent light emission efficiency contains a cathode, a first organic layer containing a compound having a cross-linkable group and a phosphorescent transition metal complex, a second organic layer containing a crosslinked body of the same compound as the compound having a cross-linkable group, and an anode in this order. The ratio of the compound having a cross-linkable group contained in the first organic layer is 2 to 10% by mass with respect to the total mass of the first organic layer. The compound having a cross-linkable group may be a compound having at least one cross-linkable group selected from cross-linkable groups represented by the formula (XL-1) to the formula (XL-19).