Amine Compound Hole Transport Layer Reduces OLED Driving Voltage
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in reducing driving voltage, improving luminance, and extending the lifetime of light emitting elements.
Innovation Solution
A light emitting element incorporating an amine compound represented by Formula 1, which includes a fluorene moiety and a tetrahydronaphthyl group, is used in the hole transport region to control energy levels and enhance charge mobility, reducing driving voltage and increasing luminance and lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional materials are used in the hole transport region, then the device structure is simple, but the driving voltage is high and luminance is low
Solution Approach 1:
The patent employs composite material strategy by combining the amine compound (Formula 1) with specific hole transport materials (HTM) and electron transport materials (ETM) in the hole transport region. This composite approach enables simultaneous optimization of energy level alignment and charge transport properties, achieving high luminance while maintaining reasonable device structure complexity.
2Power
If conventional materials are used in the hole transport region, then the manufacturing process is simple, but the driving voltage is high and efficiency is low
Solution Approach 1:
The patent applies parameter changes by systematically optimizing the molecular structure of the amine compound (Formula 1) including varying substituents (Ar1, Ar2, Ar3), ring structures (L1), and molecular weight parameters (n1, n2). These structural parameter modifications enable tuning of energy levels and charge transport properties to achieve high efficiency while maintaining compatibility with existing manufacturing processes.
3Duration of action of stationary object
If conventional materials are used in the hole transport region, then the device structure is simple, but the lifetime is short
Solution Approach 1:
The amine compound (Formula 1) acts as an intermediary material in the hole transport region, facilitating optimal interaction between holes and the electrode while protecting the emission layer. This intermediary role enables improved lifetime through better charge management and reduced degradation, while the modular molecular structure keeps the overall device complexity manageable.
Data Source
AI summary
A light emitting element of one or more embodiments may include a first electrode, a second electrode provided on the first electrode, and at least one functional layer provided between the first electrode and the second electrode. The at least one functional layer may include an amine compound of one or more embodiments, represented by Formula 1. Accordingly, the light emitting element of one or more embodiments may show a low driving voltage, high luminance, high efficiency and long-life characteristics.