Organic EL Intermediate Layer for Carrier Transfer
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Solution Overview
Problem
In organic electroluminescence devices, the transfer of carriers between adjacent layers is not smooth due to interfacial issues, leading to suboptimal luminous efficiency and reliability, which is also a problem in related devices like solar cells.
Innovation Solution
An electronic device with a pair of electrodes and laminate layers, including a first organic semiconductor layer, a second organic semiconductor layer, and an intermediate layer composed of a compound with specific functional groups (A1-B-A2) that facilitates carrier transfer between the layers, where A1 and A2 are positioned on one side and B is on the other, improving adhesion and carrier transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic semiconductor layers with different carrier transport properties are laminated to improve luminance, then luminance is improved, but carrier transfer between adjacent layers becomes insufficient
Solution Approach 1:
An intermediate layer comprising a specific compound (formula 1) is introduced between the first and second organic semiconductor layers. This intermediate layer acts as a mediator to facilitate carrier transfer across the interface, resolving the contradiction by enabling efficient carrier transfer while maintaining the laminated structure's luminance enhancement capability.
Solution Approach 2:
The patent employs a composite layered structure where the intermediate layer combines specific functional groups (A1, A2 with polar/ionic characteristics and B with electron transport capability) to create a material that bridges the properties of adjacent layers with different carrier transport characteristics, enabling both high luminance and efficient carrier transfer.
2Illumination intensity
If molecular structures and aggregation states of organic EL materials are optimized to improve light emission, then light emission characteristics are improved, but carrier transfer at layer interfaces remains insufficient
Solution Approach 1:
The intermediate layer serves as a specialized mediator at the interface between organic semiconductor layers, addressing carrier transfer insufficiency without altering the optimized molecular structures and aggregation states of the light emitting materials in the adjacent layers.
Solution Approach 2:
The patent applies local quality by introducing a specialized intermediate layer only at the critical interface region where carrier transfer occurs, while maintaining the optimized molecular structures and aggregation states of the organic EL materials in the bulk regions of the adjacent layers for optimal light emission.
Data Source
AI summary
An electronic device having an intermediate layer which can transfer smoothly carriers between two layers adjacent to the intermediate layer and having improved properties, and electronic equipment having high reliability are provided. An electronic device includes a pair of electrodes and laminated layers provided between the electrodes. The laminated layers include a hole transport layer (first organic semiconductor layer), a light emitting layer (second organic semiconductor layer), and an intermediate layer provided between the first and second organic semiconductor layers so as to make contact with both of the hole transport layer and the light emitting layer. The intermediate layer is constituted of a compound represented by a general formula A1-B-A2. In this formula, each of the A1 and A2 is a group including at least one of a primary amino group, a secondary amino group, a tertiary amino group, a hydroxyl group, a carbonyl group and a carboxyl group, the A1 and A2 are the same or different, and optionally simultaneously exist, and the B is a group including a fluorene ring. Molecules of the compound are oriented in a state that each group A1 and each group A2 are positioned on the side of the hole transport layer and each group B is positioned on the side of the light emitting layer.