Heterocyclic Compound for OLED Luminance and Lifespan
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Solution Overview
Problem
There is a continuous need for developing new materials for organic light emitting devices to improve efficiency and lifespan, as existing materials do not adequately address the requirements for low driving voltage and extended lifespan.
Innovation Solution
A hetero-cyclic compound represented by Chemical Formula 1 is used in the organic material layers of the device, which can function as a hole injection, hole transport, light emission, electron transport, or electron injection layer, enhancing the device's efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional electroluminescent materials are used, then device structure can be simplified, but luminance is insufficient and viewing angle is limited
Solution Approach 1:
The patent uses composite materials by combining low molecular weight host materials with guest dopant materials to create phosphorescent and fluorescent emission layers. This composite approach enables achievement of high luminance and wide viewing angles through enhanced light emission properties, while avoiding the need for complex device structures that would be required if conventional materials were used alone.
Solution Approach 2:
The patent changes the chemical and physical parameters of the emission materials by selecting specific host-guest combinations with optimized molecular weights, LUMO levels, and HOMO levels. These parameter optimizations enable the emission layers to achieve high luminance and broad viewing angles without requiring complex device architecture modifications.
2Illumination intensity
If conventional emission materials are used, then manufacturing process can be simplified, but luminance and viewing angle cannot be improved simultaneously
Solution Approach 1:
The patent optimizes key material parameters including molecular weight (500-5000 for host, 100-1000 for guest), LUMO level (-2.0 to -4.0 eV for host, -2.5 to -4.5 eV for guest), and HOMO level (5.0 to 6.0 eV for host, 5.5 to 6.5 eV for guest). These parameter specifications enable simultaneous achievement of high luminance and ease of manufacturing through solution processing methods.
Solution Approach 2:
The patent applies local quality by using guest dopant materials at controlled concentrations (0.1-10 wt%) dispersed within the host material matrix. This localized distribution of guest molecules within specific regions of the emission layer enables optimized luminescence properties while maintaining manufacturing simplicity through solution processing.
3Ease of manufacture
If simple device structure is used, then manufacturing is easier, but luminance is low and viewing angle is narrow
Solution Approach 1:
The patent employs composite phosphorescent and fluorescent emission materials with carefully selected host-guest combinations. This material-level complexity substitution for structural complexity allows the use of simpler device structures while achieving high luminance through enhanced light emission from the optimized composite emission layers.
4Illumination intensity
If conventional materials are used, then device complexity remains low, but both luminance and viewing angle cannot be enhanced
Solution Approach 1:
The patent achieves high luminance and wide viewing angles by changing the chemical parameters of the emission materials, specifically selecting host materials with molecular weights of 500-5000 and LUMO levels of -2.0 to -4.0 eV, and guest materials with molecular weights of 100-1000 and LUMO levels of -2.5 to -4.5 eV. These parameter optimizations enable improved performance without increasing emission layer structural complexity.
Solution Approach 2:
The patent uses locally optimized guest dopant distributions within the host matrix, with guest concentrations of 0.1-10 wt%, to achieve enhanced luminescence properties. This localized optimization allows high luminance and wide viewing angles without requiring complex multi-layer emission structures.
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 compound improves the efficiency and lifespan of the organic light emitting device by reducing driving voltage and extending its operational life, making it suitable for use in various layers such as hole injection, transport, emission, and electron injection layers.
Implementation Method 1
the organic light emitting element comprises a first electrode, a second electrode and an organic electroluminescent material formed between the first electrode and the second electrode
Data Source
Figure 1~2
AI summary
The present specification provides a hetero-cyclic compound and an organic light emitting device including the same.