OLED Charge Generation Layer Composition for Lower Driving Voltage
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in optimizing charge generation and transport layers to enhance electron transfer efficiency and reduce driving voltage, which affects overall performance and energy efficiency.
Innovation Solution
Incorporation of a heterocyclic compound in the n-type charge generation layer, combined with an electron transport compound and optionally an alkali metal or lanthanide metal, to improve electron transport properties and control crystallization, thereby enhancing charge flow and reducing interfacial energy barriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional charge generation and transport layers are used, then device structure is simple, but electron transfer efficiency is insufficient and driving voltage is high
Solution Approach 1:
The patent modifies the chemical composition parameters of the charge generation layer by incorporating heterocyclic compounds with specific molecular structures (containing nitrogen-containing six-membered aromatic rings). This changes the electronic properties and energy levels of the layer, enabling more efficient electron transfer from the emission layer to the electron transport region, thereby reducing the driving voltage required for device operation.
Solution Approach 2:
The patent creates a composite charge generation layer by combining heterocyclic compounds with electron transport compounds and optionally alkali metals or lanthanide metals. This composite structure synergistically improves electron transfer efficiency while maintaining structural integrity, allowing the device to achieve lower driving voltages without compromising the simple overall device architecture.
2Productivity
If charge generation layer is optimized for electron transfer, then electron transport efficiency improves, but device complexity increases
Solution Approach 1:
The heterocyclic compound used in the charge generation layer performs multiple functions simultaneously: it facilitates electron transfer from the emission layer, provides electron transport pathways, and maintains structural compatibility with adjacent layers. This multi-functionality allows the charge generation layer to optimize charge transport efficiency without requiring additional separate layers or complex multi-component structures, thereby avoiding increased device 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 proposed solution improves charge generation and transport efficiency, leading to reduced driving voltage and enhanced performance of the organic light-emitting device.
Implementation Method 1
electrons provided from the second electrode may move toward the emission layer through the electron transport region
Implementation Method 2
combined with an electron transport compound and optionally an alkali metal or lanthanide metal, to improve electron transport properties and control crystallization
Implementation Method 3
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit from an excited state to a ground state to thereby generate light
Data Source
AI summary
Provided are an organic light-emitting device and an apparatus including the same. The organic light-emitting device includes a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode. The organic layer includes m emission units; and m-1 charge generation units between two neighboring emission units among the m emission units, wherein m is an integer of 2 or more, and at least one of the m-1 charge generation units includes a heterocyclic compound represented by Formula 1 below:Substituents in Formula 1 may be understood as described in connection with the detailed description.