Crosslinked Phosphorescent Organic Light Emitting Device
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Solution Overview
Problem
The existing light emitting devices, particularly those disclosed in Patent document 1, do not have sufficient luminance life.
Innovation Solution
A light emitting device comprising an anode, a cathode, a first organic layer, and a second organic layer, where the first organic layer contains one or more phosphorescent compounds and the second organic layer contains the same phosphorescent compound crosslinked with a crosslinkable material, specifically utilizing a crosslinkable group selected from Group A, to enhance luminance life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a light emitting device uses phosphorescent compounds in organic layers without crosslinking, then the device can be manufactured with simpler processes, but the luminance life is insufficient
Solution Approach 1:
The patent uses composite materials by combining phosphorescent compounds with crosslinkable materials in the organic layers. This creates a crosslinked network structure that enhances the stability and luminance life of the light emitting device while maintaining manufacturability through solution processing.
Solution Approach 2:
The patent changes the chemical state of the organic layers by introducing crosslinkable groups that form crosslinked structures. This parameter change from non-crosslinked to crosslinked states improves the durability and luminance life of the device without significantly complicating the manufacturing process.
2Reliability
If the same phosphorescent compound is used in both organic layers with crosslinking, then the emission efficiency and stability are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs the same phosphorescent compound in both organic layers, creating homogeneity in the emission characteristics. This ensures consistent light emission and stability across the device while the crosslinking provides structural uniformity. The solution-processable nature of the materials maintains ease of manufacture.
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 luminance life by using a crosslinked phosphorescent compound structure in both layers, ensuring better stability and emission efficiency.
Implementation Method 1
the first organic layer is a layer comprising one or more phosphorescent compounds, the second organic layer is a layer comprising one or more phosphorescent compounds
Implementation Method 2
a crosslinked body of a crosslinkable material having at least one crosslinkable group selected from Group A of crosslinkable group
Data Source
AI summary
Provided is a light emitting device excellent in luminance life. A light emitting device comprising an anode, a cathode, a first organic layer disposed between the anode and the cathode (a layer comprising one or more phosphorescent compounds) and a second organic layer disposed between the anode and the first organic layer (a layer comprising one or more phosphorescent compounds and a crosslinked body of a crosslinkable material), wherein at least one phosphorescent compound contained in the first organic layer and at least one phosphorescent compound contained in the second organic layer are the same phosphorescent compound represented by the formula (1): wherein M represents an iridium atom or the like, n1 represents an integer of 1 or more, n2 represents an integer of 0 or more, E1 and E2 represent a carbon atom or the like, the ring L1 represents an aromatic heterocyclic ring, the ring L2 represents an aromatic hydrocarbon ring or the like, A1-G1-A2 represents an anionic bidentate ligand, and at least one ring selected from among the ring L1 and the ring L2 has an aryl group, a monovalent heterocyclic group or a substituted amino group.