OLED Hole Transport Layer Composition for Low-Voltage Long Life
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving long service life, improved light-emitting efficiency, and low driving voltage due to the need for stable and efficient materials in the organic material layers.
Innovation Solution
Incorporating a hole transport region with a compound of Chemical Formula 1 and a dopant with a compound of Chemical Formula 2, which includes a non-aromatic pentagonal ring, enhances stability and efficiency by preventing material degradation and optimizing electron density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional organic materials are used in the organic material layer, then the device structure is simple, but the service life is short and light-emitting efficiency is low
Solution Approach 1:
The organic material layer is divided into multiple functional sub-layers: hole injection layer, hole transport layer, light emitting layer, electron blocking layer, electron transport layer, and electron injection layer. Each layer is optimized with specific materials to perform its designated function, thereby extending service life and improving efficiency without requiring complete structural redesign
Solution Approach 2:
The patent employs composite material systems where each layer uses specially selected organic materials with complementary properties. For example, the light emitting layer combines host materials with dopant materials to achieve both stability and high light-emitting efficiency, while charge transport layers use materials optimized for specific carrier transport properties
2Productivity
If conventional organic materials are used in the organic material layer, then the manufacturing process is simple, but the light-emitting efficiency is low
Solution Approach 1:
Different regions of the organic material layer are assigned materials with locally optimized properties. The hole transport layer uses materials with high hole mobility, the electron transport layer uses materials with high electron mobility, and the light emitting layer uses materials with high quantum efficiency. This localized optimization achieves high overall light-emitting efficiency while maintaining manufacturability through established deposition techniques
3Power
If conventional organic materials are used, then the device structure is straightforward, but the driving voltage is high
Solution Approach 1:
The organic material layer is segmented into multiple functional layers including hole injection layer, hole transport layer, light emitting layer, electron blocking layer, electron transport layer, and electron injection layer. Each layer is designed to optimize charge injection and transport, reducing overall driving voltage through cumulative effect of optimized interfaces and material properties
Solution Approach 2:
The patent optimizes key parameters of organic materials including HOMO/LUMO energy levels, charge mobility, and layer thicknesses. By carefully selecting materials with appropriate energy level alignments and optimizing layer thickness parameters, the device achieves lower driving voltage while maintaining the multi-layer structure
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 organic light-emitting device achieves high efficiency, low voltage, and extended service life through the synergistic effects of these compounds, which maintain light-emitting characteristics and thermal stability.
Implementation Method 1
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by using an organic material
Implementation Method 2
the excitons generated by the host are transported to the dopant to emit light with high efficiency
Data Source
AI summary
Provided is an organic light emitting device including: a cathode; an anode facing the cathode;a light emitting layer between the cathode and the anode and comprising a host and a dopant;a hole transport region between the anode and the light emitting layer; andan electron transport region between the cathode and the light emitting layer,wherein the hole transport region includes an organic material layer comprising a compound of Chemical Formula 1, and the dopant comprises a compound of Chemical Formula 2:wherein:Ar1 to Ar6 are each independently a substituted or unsubstituted: C6-60 aryl group or C2-60 heterocyclic group, or are bonded to an adjacent substituent to form a substituted or unsubstituted ring;Cy is a substituted or unsubstituted: aliphatic hydrocarbon ring, aromatic ring, or hetero ring, or a substituted or unsubstituted ring in which these rings are fused.