Electron Transport Layer Composition for Low-Voltage OLED Emission
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving low driving voltage, high luminescence efficiency, and long lifespan while maintaining wide viewing angles and high contrast ratios.
Innovation Solution
The light-emitting device incorporates specific electron transport and injection layers composed of compounds represented by Formulas 1 and 2, utilizing metals and their halides or complexes, with controlled material ratios to enhance electron transport and injection efficiency, and includes a layered structure with hole transport and emission layers for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional electron transport and injection layers are used, then device structure is simple, but driving voltage is high and luminescence efficiency is low
Solution Approach 1:
The electron transport region is divided into multiple distinct layers: electron transport layer, electron injection layer, and buffer layer. Each layer is composed of specific materials (compounds of formulas 1 and 2 with metals, halides, or complexes) that perform specialized functions, enabling optimized electron transport and injection that reduces driving voltage while maintaining manageable structural complexity through functional segmentation.
Solution Approach 2:
The patent employs composite material systems where organic compounds (formulas 1 and 2) are combined with inorganic materials (metals, halides, or their complexes) in the electron transport and injection layers. This composite approach creates synergistic effects that enhance electron transport efficiency and reduce driving voltage, achieving high luminescence efficiency without excessive structural complexity.
2Productivity
If conventional electron transport and injection layers are used, then device structure is simple, but luminescence efficiency is low
Solution Approach 1:
The electron transport region is divided into multiple distinct layers: electron transport layer, electron injection layer, and buffer layer. Each layer is composed of specific materials (compounds of formulas 1 and 2 with metals, halides, or complexes) that perform specialized functions, enabling optimized electron transport and injection that reduces driving voltage while maintaining manageable structural complexity through functional segmentation.
Solution Approach 2:
The patent employs composite material systems where organic compounds (formulas 1 and 2) are combined with inorganic materials (metals, halides, or their complexes) in the electron transport and injection layers. This composite approach creates synergistic effects that enhance electron transport efficiency and reduce driving voltage, achieving high luminescence efficiency without excessive structural complexity.
3Duration of action of stationary object
If conventional electron transport and injection layers are used, then device structure is simple, but lifespan is short
Solution Approach 1:
The electron transport region is divided into multiple distinct layers: electron transport layer, electron injection layer, and buffer layer. Each layer is composed of specific materials (compounds of formulas 1 and 2 with metals, halides, or complexes) that perform specialized functions, enabling optimized electron transport and injection that reduces driving voltage while maintaining manageable structural complexity through functional segmentation.
Solution Approach 2:
The patent employs composite material systems where organic compounds (formulas 1 and 2) are combined with inorganic materials (metals, halides, or their complexes) in the electron transport and injection layers. This composite approach creates synergistic effects that enhance electron transport efficiency and reduce driving voltage, achieving high luminescence efficiency without excessive structural 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 solution achieves a light-emitting device with low driving voltage, high luminescence efficiency, and extended lifespan, supporting applications in electronic apparatuses with enhanced characteristics.
Implementation Method 1
an electron transport region between the emission layer and the second electrode, the electron transport region may include an electron transport layer and an electron injection layer between the electron transport layer and the second electrode
Implementation Method 2
Holes provided from the first electrode move toward the emission layer through the hole transport region, and electrons provided from the second electrode move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate light.
Data Source
AI summary
A light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer including an emission layer between the first electrode and the second electrode and an electron transport region between the emission layer and the second electrode. The electron transport region includes an electron transport layer and an electron injection layer between the electron transport layer and the second electrode. The electron transport layer includes a first material and a second material, the electron injection layer includes a third material and a fourth material, and an amount of the third material is in a range of about 50 parts by weight to about 99 parts by weight, based on a total of 100 parts by weight of the electron injection layer. The first material to the fourth material are respectively the same as described in the specification.