Conjugated Polymer Layered Structure for Electroluminescence Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electroluminescence devices have insufficient luminance due to suboptimal layer structures between light-emitting layers and electrodes or charge separation layers.
Innovation Solution
A layered structure incorporating a conjugated polymer compound with specific repeating units, including a divalent aromatic group and substituent groups, is introduced between the light-emitting or charge separation layer and the electrode, enhancing luminance by balancing charge and improving solubility and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-conjugated polymer compound containing a substituent group with cation and hetero atoms is used between light-emitting layer and electrode, then charge balance is improved, but luminance remains insufficient
Solution Approach 1:
The patent changes the fundamental chemical structure parameter from non-conjugated polymer to conjugated polymer, which fundamentally alters the electrical and optical properties. The conjugated structure enables both charge transport and light emission, simultaneously improving charge balance and luminance
Solution Approach 2:
The patent creates a composite material system by incorporating specific repeating units with divalent aromatic groups and substituent groups containing hetero atoms into the conjugated polymer backbone, combining the benefits of charge transport and optical properties
2Reliability
If various layers are inserted between light-emitting layer and electrode to improve device characteristics, then device performance is enhanced, but device structure becomes more complex
Solution Approach 1:
The conjugated polymer compound performs multiple functions simultaneously: it acts as a charge transport layer, an interfacial modification layer, and contributes to light emission. This multi-functionality eliminates the need for multiple separate layers, simplifying the device structure while maintaining enhanced performance
Solution Approach 2:
The patent merges the functions of multiple separate layers into a single conjugated polymer layer, combining charge transport, interface modification, and light emission functions that were previously requiring distinct layers
Data Source
AI summary
Disclosed is a layered structure including a first electrode and a second electrode, a light-emitting layer or a charge separation layer between the first electrode and the second electrode, and a layer containing a conjugated polymer compound between the light-emitting layer or the charge separation layer and the first electrode, wherein the conjugated polymer compound contains a repeating unit selected from the group consisting of a repeating unit represented by formula (1): wherein Ar1 represents a divalent aromatic group, R1 represents a substituent group having a group represented by formula (2), Ar1 may have a substituent group other than R1, and n1 represents an integer of 1 or more; -(R2)c1-(Q1)n2-Y1 (M1)a1(Z1)b1 (2) wherein R2 represents a divalent aromatic group which may have a substituent group, Q1 represents a divalent organic group which may have a substituent group, Y1 represents a carbocation, an ammonium cation, a phosphonyl cation or a sulfonyl cation, M1 represents F-, Cl-, Br-, I-, OH-, RaSO3-, RaCOO-, ClO-, ClO2-, ClO3-, ClO4-, SCN-, CN-, NO3-, SO42-, HSO4-, PO43-, HPO42-, H2PO4-, BF4- or PF6-, Z1 represents a metal ion or an ammonium ion which may have a substituent group, cl represents 0 or 1, n2 represents an integer of 0 or more, provided that n2 is 0 when c1 is 0, a1 represents an integer of 1 or more, b1 represents an integer of 0 or more, a1 and b1 are selected so that the charge of the substituent group represented by formula (2) is 0, Ra represents an alkyl group having 1 to 30 carbon atoms, which may have a substituent group, or an aryl group having 6 to 50 carbon atoms, which may have a substituent group.