Organic Charge Generating Layers for Light Emitting Devices
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Solution Overview
Problem
Current light-emitting devices face challenges in simplifying manufacturing processes, achieving improved luminous efficiency and lifetime, and reducing leakage current, which affects display quality.
Innovation Solution
A light-emitting device design incorporating a first and second electrode with overlapping emission parts and (m-1) charge generating layers, where each charge generating layer includes an n-type and p-type charge generating layer, specifically using compounds represented by Chemical Formula 1, which do not contain inorganic materials, to enhance electron and hole transport, and an electron transport region with a compound represented by Chemical Formula 1 for improved energy levels and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inorganic materials are used in charge generating layers, then electron transport efficiency is improved, but manufacturing complexity and leakage current increase
Solution Approach 1:
The patent changes the material composition parameter by using purely organic compounds (Formula 1) instead of inorganic materials in the n-type charge generating layer, while adjusting the LUMO energy level parameter to -2.8 eV to -3.4 eV to achieve optimal electron transport efficiency without requiring complex inorganic material processing
Solution Approach 2:
The patent employs organic compounds that can be processed through simpler solution-based manufacturing methods compared to inorganic materials, reducing manufacturing complexity and enabling easier fabrication of the charge generating layers
2Reliability
If inorganic materials are used in charge generating layers, then charge generation is enhanced, but leakage current increases
Solution Approach 1:
The patent adjusts the chemical structure parameters of the organic compound (Formula 1) and its LUMO energy level (-2.8 eV to -3.4 eV) to optimize charge generation efficiency while preventing excessive charge carrier generation that would lead to leakage current
Solution Approach 2:
The organic compound in Formula 1 acts as an intermediary material that facilitates charge generation between the electrodes and emission layers while controlling charge carrier density to prevent leakage current, replacing inorganic materials that cause harmful leakage effects
3Loss of energy
If complex charge generating layer structures are used, then luminous efficiency is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the n-type and p-type charge generating layers into a single integrated structure using the organic compound Formula 1, achieving improved luminous efficiency through enhanced charge generation while simplifying the manufacturing process by reducing the number of separate layers and materials required
Solution Approach 2:
The organic compound Formula 1 serves multiple functions simultaneously as both the n-type charge generating layer material and the electron transport region material, reducing manufacturing complexity by eliminating the need for separate inorganic material deposition processes
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 simplifies the manufacturing process, enhances luminous efficiency, extends the device's lifetime, reduces leakage current, and improves display quality by optimizing charge generation and transport without inorganic materials.
Implementation Method 1
the n-type charge generating layer may include a compound represented by Chemical Formula 1... A lowest unoccupied molecular orbital (LUMO) energy level of the n-type charge generating layer may be in a range of about −2.8 eV to about −3.4 eV
Implementation Method 2
Holes and electrons combine to form excitons in an emission layer region. Light is generated as the excitons change from an excited state to a ground state.
Data Source
AI summary
A light-emitting device includes: a first electrode; a second electrode that overlaps the first electrode; m emission parts positioned between the first electrode and the second electrode; and (m-1) charge generating layers disposed between adjacent emission parts. Each of the charge generating layers may include an n-type charge generating layer and a p-type charge generating layer, and the n-type charge generating layer may include a compound represented by Chemical Formula 1: