Light-Emission Element Using Crosslinked Polymer and Metal Complex
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting devices, such as those described in Patent documents 1 and 2, do not have sufficient external quantum efficiency.
Innovation Solution
A light emitting device comprising an anode, a cathode, a first organic layer formed using a composition with a compound represented by formula (H-A) and a metal complex represented by formula (1), and a second organic layer formed using a polymer compound with a crosslinkable group, enhancing the external quantum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light emitting devices are used, then they can be manufactured with standard materials, but they do not achieve sufficient external quantum efficiency
Solution Approach 1:
The patent uses a composite material system consisting of a polymer compound with crosslinkable groups (such as vinyl groups) combined with specific metal complexes (iridium, platinum, or osmium complexes with cyclometalating ligands). This composite approach in the light emitting layer achieves high external quantum efficiency while maintaining ease of manufacture through solution processing and crosslinking techniques.
2Reliability
If the light emitting layer uses standard materials, then the device structure is simple, but the external quantum efficiency is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the light emitting layer by introducing polymer compounds with crosslinkable groups and specific metal complexes. The crosslinking process modifies the physical and chemical properties of the layer, enhancing light emission efficiency without requiring complex multi-layer structures. The solution processable nature maintains structural simplicity.
3Productivity
If conventional organic layers are used, then the manufacturing process is straightforward, but the light emission efficiency is not optimized
Solution Approach 1:
The patent incorporates crosslinkable groups (vinyl, epoxy, oxetane, etc.) into the polymer compound structure before device fabrication. This preliminary preparation allows the light emitting layer to be formed by simple solution coating, followed by crosslinking treatment that optimizes light emission efficiency. The pre-designed molecular structure enables efficient light emission without complex processing steps.
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 significantly improves the external quantum efficiency of the light emitting device, making it more effective for applications in displays and lighting.
Implementation Method 1
a second organic layer which is a layer obtained by using a polymer compound comprising a constitutional unit having a crosslinkable group
Implementation Method 2
a first organic layer which is a layer obtained by using a composition comprising a compound represented by formula (H-A) and a metal complex represented by formula (1)
Data Source
AI summary
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 cathode, wherein the first organic layer is a layer obtained by using a composition comprising a compound represented by the formula (H-A) and a metal complex represented by the formula (1), and the second organic layer is a layer obtained by using a polymer compound comprising a constitutional unit having a crosslinkable group: wherein ZA represents a group represented by -N(RZA)-, a sulfur atom, an oxygen atom or the like, and RZA and RZ1 to RZ4 represent a hydrogen atom or a substituent, and at least one of RZ1 to RZ4 is a monovalent heterocyclic group, Z1 to Z4 represent a carbon atom or a nitrogen atom, and the ring RHA represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring: wherein M represents an iridium atom, a platinum atom or the like, n1 represents an integer of 1 or more, n2 represents an integer of 0 or more, and n1 +n2 is 2 or 3, E1A to E4A and E2 represent a nitrogen atom or a carbon atom, R2A, R3A and R4A represent a hydrogen atom or a substituent, the ring R1A represents a triazole ring, the ring RB represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and A1-G1-A2 represents an anionic bidentate ligand.