Organic Electroluminescent Element Dual Emitting Layer Structure
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in achieving enhanced performance, improved luminous efficiency, and extended lifetime, with existing compounds not adequately addressing these requirements.
Innovation Solution
The use of specific organic electroluminescence devices with a dual emitting layer structure, where the first emitting layer contains a compound represented by a particular formula with specific groups, and the second emitting layer contains a different compound, both of which are distinct host materials, enhancing the device's performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single emitting layer structure is used, then the device structure is simple, but the luminous efficiency and lifetime are insufficient
Solution Approach 1:
The emitting layer is divided into two distinct emitting layers (first emitting layer and second emitting layer), each containing different host materials and dopant combinations. This segmentation allows optimization of different regions for specific functions, thereby improving overall device lifetime and luminous efficiency without excessive complexity increase
Solution Approach 2:
Each emitting layer employs composite material systems with specific host-guest combinations. The first emitting layer uses a first host material with a first dopant, while the second emitting layer uses a second host material with a second dopant. These composite material designs enable tailored optoelectronic properties that enhance device performance and durability
2Device complexity
If conventional compounds are used in the emitting layer, then the device structure is simple, but the luminous efficiency is insufficient
Solution Approach 1:
The invention employs specific compound structures with defined molecular formulas and structural parameters. The first compound and second compound have distinct structural characteristics that optimize charge transport, exciton management, and light emission properties, thereby improving luminous efficiency without significantly increasing device complexity
Solution Approach 2:
The emitting layers utilize composite material systems where host materials and dopant materials work synergistically. The first host material combined with the first dopant in the first emitting layer, and the second host material combined with the second dopant in the second emitting layer, creates optimized composite systems that reduce energy loss and enhance luminous efficiency
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 improved luminous efficiency and extended lifetime of the organic electroluminescence device, achieving better performance compared to existing technologies.
Implementation Method 1
An organic electroluminescence device has found its application in a full-color display for mobile phones, televisions and the like. When a voltage is applied to an organic EL device, holes and electrons are injected from an anode and a cathode, respectively, into an emitting layer. The injected holes and electrons are recombined in the emitting layer to form excitons.
Data Source
AI summary
An organic electroluminescence device includes a first emitting layer and a second emitting layer provided between an anode and a cathode, in which the first emitting layer contains, as a first host material, a first compound represented by a formula (1) below and having at least one group represented by a formula (11) below, and the second emitting layer contains a second host material.