Diamine-Based Interlayer for Hole Mobility in OLEDs
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Solution Overview
Problem
Current light-emitting devices face limitations in achieving optimal hole mobility and resonance effects while maintaining low driving voltage and high efficiency, particularly in organic light-emitting devices.
Innovation Solution
Incorporation of a diamine-based compound represented by Formula 1, which includes a linking group with large steric hindrance and specific substituents, into the interlayer of the light-emitting device, allowing for adjustment of energy levels and refractive index, thereby enhancing hole mobility and resonance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compounds are used in the interlayer, then device structure is simple, but hole mobility is insufficient and resonance effects are not optimized
Solution Approach 1:
The patent applies parameter changes by systematically modifying the chemical structure of the diamine-based compound, specifically varying the substituents at the R1, R2, R3, and R4 positions in Formula 1. These structural parameter changes optimize hole mobility and resonance effects while maintaining the core diamine backbone structure, thus improving performance without excessive complexity.
Solution Approach 2:
The patent employs composite material principles by combining the diamine-based compound with other organic materials in the interlayer structure. The interlayer comprises multiple organic compounds including the diamine-based compound as a key component, creating a composite material system that achieves synergistic effects for enhanced hole mobility and resonance while managing overall device complexity.
2Use of energy by moving object
If high efficiency and low driving voltage are achieved, then energy consumption is reduced, but device lifespan is limited
Solution Approach 1:
The patent applies local quality by positioning the diamine-based compound specifically in the interlayer region between the emission layer and electrode, rather than uniformly distributing materials throughout the device. This localized placement optimizes the specific region for charge transport and resonance effects, achieving low driving voltage and high efficiency while the stable compound structure in this critical region extends device lifespan.
Solution Approach 2:
The patent uses organic compounds including the diamine-based compound that can be deposited using relatively simple and cost-effective vacuum deposition techniques. The molecular structures are designed to provide sufficient operational stability for display applications while maintaining ease of fabrication, achieving a balance between device lifespan, energy efficiency, and manufacturing practicality.
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 diamine-based compound improves hole mobility and resonance effects, resulting in light-emitting devices with low driving voltage, high efficiency, and extended lifespan.
Implementation Method 1
Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region
Implementation Method 2
Incorporation of a diamine-based compound represented by Formula 1, which includes a linking group with large steric hindrance and specific substituents, into the interlayer of the light-emitting device, allowing for adjustment of energy levels and refractive index, thereby enhancing hole mobility and resonance effects
Implementation Method 3
Carriers, such as holes and electrons, recombine in an emission layer region to produce excitons. These excitons may transition from an excited state to a ground state, thereby generating light
Data Source
AI summary
A light-emitting device that includes a diamine-based compound represented by Formula 1, and an electronic apparatus that includes the light-emitting device are provided.