Light-Emitting Device With Crosslinked Polymer Hole Transport 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 design featuring a phosphorescent compound in the first organic layer and a cured polymer product from a polymer composition with crosslinkable polymer compounds in the second organic layer, where the molar ratio and molecular weight values of the monomer units and crosslinkable groups are optimized to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional polymer compound with aromatic amine constitutional unit and crosslinkable constitutional unit is used in the hole transporting layer, then the device structure is simplified and manufacturing is easier, but the external quantum efficiency is insufficient
Solution Approach 1:
The patent uses a copolymer compound comprising both a hole transporting constitutional unit (aromatic amine) and a crosslinkable constitutional unit (vinyl group-containing), creating a composite material that combines the beneficial properties of both functional groups in a single polymer chain, thereby achieving both ease of manufacture and high external quantum efficiency
Solution Approach 2:
The patent optimizes the ratio of crosslinkable constitutional units to total constitutional units (0.01 to 0.5 mol ratio) and controls the value (Y1×1000)/X1 to be 0.05 or more, where X1 is the total molecular weight and Y1 is the total crosslinkable group weight, thereby achieving the optimal balance between manufacturability and external quantum efficiency
2Loss of energy
If the crosslinkable constitutional unit content is increased to improve external quantum efficiency, then the efficiency increases, but the polymer synthesis complexity and manufacturing difficulty increase
Solution Approach 1:
The patent defines specific parameter ranges for the crosslinkable constitutional unit content (0.01 to 0.5 mol ratio) and the value (Y1×1000)/X1 (0.05 or more), which simplifies the synthesis process by providing clear targets for polymer preparation while achieving the desired external quantum efficiency improvement
Solution Approach 2:
The patent segments the polymer structure into distinct functional constitutional units: hole transporting units (aromatic amine) and crosslinkable units (vinyl groups), allowing independent optimization of each segment's properties while maintaining overall polymer functionality and simplifying synthesis planning
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
This configuration significantly improves the external quantum efficiency of the light-emitting device, leading to better performance in display and illumination applications.
Implementation Method 1
a light-emitting device comprising an anode, a cathode, a first organic layer disposed between the anode and the cathode... wherein the first organic layer comprises a phosphorescent compound
Implementation Method 2
the second organic layer comprises a cured polymer product formed from a polymer composition in which one or two or more polymer compounds including a crosslinkable polymer compound having at least one crosslinkable group
Data Source
AI summary
There is provided 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 between the anode and the first organic layer and adjacent to the first organic layer, wherein the first organic layer comprises a phosphorescent compound represented by the formula (1), and the second organic layer comprises a crosslinked body formed from a polymer compound having a crosslinkable group, and the average number of the crosslinkable groups per 1000 in molecular weight of the polymer compound is 0.5 or more.