Organic EL Device Layer Segmentation for Efficiency and Lifetime
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescence (EL) devices face challenges in achieving high luminous efficiency and device lifetime comparable to conventional devices.
Innovation Solution
The organic EL device incorporates a cathode, an anode, and an organic layer with an emitting layer and a first layer. The emitting layer contains compounds represented by formulas (1A) and (1B), while the first layer comprises a compound represented by formula (BE1), optimizing the layer configuration for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic EL device structures are used, then device lifetime is maintained at conventional levels, but luminous efficiency does not achieve high performance
Solution Approach 1:
The organic layer is segmented into multiple functional layers: a first layer (electron-transporting layer) and a second layer (emitting layer). This segmentation allows each layer to be optimized for its specific function, with the first layer using compound (BE1) for efficient electron transport and the second layer using anthracene compounds for high-efficiency light emission, thereby achieving high luminous efficiency while maintaining device lifetime.
Solution Approach 2:
The patent employs composite material strategies by combining specific compound classes in different layers: the first layer uses compound (BE1) with specific molecular structure features, while the second layer uses anthracene compounds with formula (1A) or (1B). This composite approach leverages the complementary properties of different materials to achieve both high luminous efficiency and acceptable device lifetime.
2Use of energy by moving object
If anthracene compounds are used in the emitting layer, then luminous efficiency is improved, but device lifetime may be compromised
Solution Approach 1:
The first layer comprising compound (BE1) acts as an intermediary between the cathode and the anthracene-based emitting layer. This intermediary layer facilitates efficient electron transport to the emitting layer while protecting the anthracene compounds from direct contact with the cathode, thereby enabling high luminous efficiency from the anthracene compounds while maintaining device lifetime through the protective and transport-optimizing first layer.
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
This configuration results in an organic EL device with improved luminous efficiency and device lifetime, equivalent to those of conventional devices, while also providing a novel compound suitable for use in organic EL devices.
Implementation Method 1
When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined with each other in the emitting layer, and excitons are formed therein.
Data Source
AI summary
An organic electroluminescence device including: a cathode, an anode, and an organic layer disposed between the cathode and the anode, wherein the organic layer comprises an emitting layer and a first layer, the first layer is disposed between the cathode and the emitting layer, the emitting layer comprises one or both of a compound represented by the following formula (1A) and a compound represented by the following formula (1B), and the first layer comprises a compound represented by the following formula (BE1):