OLED Emission Layer Using Anthracene Host and Condensed Ring Dopant
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Solution Overview
Problem
Current organic light-emitting diodes (OLEDs) face challenges in achieving high luminescence efficiency and lifespan due to limitations in the emission layer's composition and energy transition efficiency.
Innovation Solution
Incorporating an anthracene-based compound and a blue fluorescent condensed ring compound in the emission layer, with a specific weight ratio, to enhance luminescence efficiency and lifespan by facilitating high energy transition efficiency between the host and dopant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emission layer composition is used, then device structure is simple, but luminescence efficiency and lifespan are limited
Solution Approach 1:
The emission layer uses a composite material system comprising an anthracene-based host compound (Formula 1) and a condensed ring dopant compound (Formula 20). This composite structure enables high luminescence efficiency and extended lifespan by facilitating effective energy transfer from host to dopant, while maintaining a manageable two-component composition.
Solution Approach 2:
The patent optimizes the weight ratio of the host compound to dopant compound within the range of 99.9:0.01 to 80:20. By adjusting this compositional parameter, the emission layer achieves high luminescence efficiency and extended device lifespan, demonstrating how parameter optimization resolves the contradiction between performance improvement and composition complexity.
2Productivity
If conventional emission layer composition is used, then composition is simple, but luminescence efficiency is limited
Solution Approach 1:
The emission layer employs a composite material system comprising an anthracene-based host compound (Formula 1) and a condensed ring dopant compound (Formula 20). This composite structure enables high luminescence efficiency and extended lifespan by facilitating effective energy transfer from host to dopant, while maintaining a manageable two-component composition.
Solution Approach 2:
The patent optimizes the weight ratio of the host compound to dopant compound within the range of 99.9:0.01 to 80:20. By adjusting this compositional parameter, the emission layer achieves high luminescence efficiency and extended device lifespan, demonstrating how parameter optimization resolves the contradiction between performance improvement and composition complexity.
3Use of energy by moving object
If conventional emission layer composition is used, then energy transition efficiency is limited, but material selection is easier
Solution Approach 1:
The emission layer employs a composite material system comprising an anthracene-based host compound (Formula 1) and a condensed ring dopant compound (Formula 20). This composite structure enables high luminescence efficiency and extended lifespan by facilitating effective energy transfer from host to dopant, while maintaining a manageable two-component composition.
Solution Approach 2:
The patent optimizes the weight ratio of the host compound to dopant compound within the range of 99.9:0.01 to 80:20. By adjusting this compositional parameter, the emission layer achieves high luminescence efficiency and extended device lifespan, demonstrating how parameter optimization resolves the contradiction between performance improvement and composition complexity.
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
The use of the anthracene-based compound as a host and the condensed ring compound as a dopant in the OLED's emission layer results in high luminescent efficiency and extended lifespan, suitable for full-color OLEDs with improved luminescent characteristics.
Implementation Method 1
a blue fluorescent condensed ring compound
Implementation Method 2
When a voltage is applied between the anode and the cathode, holes injected from the anode may move to the emission layer via the hole transport layer, and electrons injected from the cathode may move to the emission layer via the electron transport layer. The holes and electrons (e.g., carriers) may recombine in the emission layer to generate excitons. When the excitons drop from an excited state to a ground state, light may be emitted.
Data Source
AI summary
An organic light-emitting diode including a substrate; a first electrode on the substrate; a second electrode facing the first electrode; and an emission layer between the first electrode and the second electrode, the emission layer including an anthracene-based compound represented by Formula 1, below, and a condensed ring compound represented by Formula 20, below: