Conductive Polymer for Organic EL Devices
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Solution Overview
Problem
Conventional methods for manufacturing organic electroluminescent devices face challenges in achieving high light emitting efficiency due to mutual dissolution between organic layers, leading to deteriorated characteristics such as light emitting efficiency, color purity, and pattern accuracy.
Innovation Solution
A conductive polymer with a linear main chain and branching carrier transport structures, optimized to maintain appropriate intervals between adjacent structures, reducing electron density polarization and enhancing hole transport ability, is used to form a reliable conductive layer for organic electroluminescent devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If organic layers are laminated using conventional application methods, then device structure is formed, but mutual dissolution occurs between adjacent layers causing deterioration of light emitting efficiency, color purity, and pattern accuracy
Solution Approach 1:
The patent applies preliminary action by pre-treating the lower organic layer with a solvent resistance improving treatment before forming the upper organic layer. This preliminary treatment prevents mutual dissolution when subsequent layers are applied, thereby maintaining pattern accuracy and layer integrity without requiring changes to the lamination process itself.
2Reliability
If organic materials are polymerized to improve solvent resistance of lower organic layer, then durability is improved, but device characteristics are not sufficiently improved
Solution Approach 1:
The patent applies parameter changes by modifying the molecular weight and chemical structure parameters of the polymer material used in the lower organic layer. Specifically, it uses a polymer with a number-average molecular weight of 10,000-1,000,000 and specific functional groups that provide both solvent resistance and maintain device characteristics, rather than simply polymerizing any organic material.
3Reliability
If curing resin is added to organic material to cure together, then solvent resistance is improved, but device characteristics are not sufficiently improved
Solution Approach 1:
The patent applies composite materials by creating a lower organic layer that is a composite of organic material and polymer material with specific properties. This composite structure provides both the solvent resistance needed for durability and maintains the device characteristics, overcoming the limitations of simply adding curing resin to organic materials.
Data Source
AI summary
A conductive polymer having a high carrier transport ability, a conductive layer formed using the conductive polymer, an electronic device provided with the conductive layer having a high reliability, and electronic equipment provided with such an electronic device are provided. The conductive polymer includes a linear main chain, a plurality of carrier transport structures which contribute to carrier transport and each of which is represented by the following formula (1), and a linking structure which branches off from the main chain to link each of the carrier transport structures to the main chain: General Formula (1) where each R1 independently represents a hydrogen atom, a methyl group or an ethyl group, and the R1s are the same or different.