Heterocyclic Electron Transport Layers for OLED Voltage and Lifespan
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving optimal performance in terms of driving voltage, efficiency, and lifespan, particularly due to limitations in the electron transport regions.
Innovation Solution
Incorporating a heterocyclic compound represented by Formula 1 and another heterocyclic compound represented by Formula 2 in the electron transport region of a light-emitting device, with specific configurations in the first and second electron transport layers to enhance electron injection and reduce exciton quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional electron transport materials are used in the electron transport region, then the device structure can be kept simple, but the driving voltage is high and efficiency is low
Solution Approach 1:
The patent employs composite electron transport layers combining multiple heterocyclic compounds (Formula 1 and Formula 2) with different functional characteristics. This composite material approach allows optimization of electron injection and transport properties, achieving lower driving voltage while maintaining structural feasibility through synergistic material combinations.
Solution Approach 2:
The patent systematically varies molecular parameters of heterocyclic compounds including substituent groups (Ar11-Ar13, Ar21-Ar24), ring structures (X11-X26), and linker groups (L11-L25) to optimize electron transport characteristics. By changing these molecular parameters, the device achieves improved driving voltage and efficiency without fundamental structural changes.
2Ease of manufacture
If conventional electron transport materials are used in the electron transport region, then the manufacturing process can be kept simple, but efficiency and lifespan are insufficient
Solution Approach 1:
The patent uses composite electron transport layers with multiple heterocyclic compounds that can be deposited using conventional vacuum deposition techniques. The composite material system maintains compatibility with existing manufacturing processes while significantly improving device efficiency and operational lifespan through optimized electron transport and reduced exciton quenching.
Solution Approach 2:
The patent optimizes molecular parameters of heterocyclic compounds (substituent groups, ring structures, linker groups) to enhance electron mobility and reduce energy loss. These parameter changes improve efficiency and lifespan while maintaining compatibility with standard manufacturing processes.
3Reliability
If conventional electron transport materials are used in the electron transport region, then the device can operate, but exciton quenching occurs and reduces lifespan
Solution Approach 1:
The patent introduces heterocyclic compounds (Formula 1 and Formula 2) as intermediary materials between the emission layer and electron injection layer. These intermediary compounds have optimized energy levels and molecular structures that facilitate electron transport while minimizing exciton quenching, thereby extending device lifespan without compromising operational reliability.
Solution Approach 2:
The patent changes molecular parameters of electron transport materials including heteroatom composition (X11-X26), substituent groups (Ar11-Ar24), and linker structures (L11-L25) to optimize the balance between electron injection efficiency and exciton quenching reduction. These parameter optimizations extend device lifespan while maintaining reliable operation.
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 configuration improves driving voltage, increases efficiency, and extends the lifespan of the light-emitting device by facilitating better electron injection and reducing exciton quenching at the emission layer.
Implementation Method 1
In a light-emitting device, a first electrode is arranged on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode may be sequentially arranged on the first electrode. 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.
Implementation Method 2
The proposed configuration improves driving voltage, increases efficiency, and extends the lifespan of the light-emitting device by facilitating better electron injection and reducing exciton quenching at the emission layer.
Data Source
AI summary
Embodiments provide a light-emitting device, an electronic apparatus including the light-emitting device, and electronic equipment including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, a heterocyclic compound represented by Formula 1, and a heterocyclic compound represented by Formula 2, wherein Formulae 1 and 2 are explained in the specification: