Polycyclic Compound for OLED Emission Efficiency
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in reducing driving voltage and increasing emission efficiency and lifespan, particularly in achieving high efficiency through techniques like phosphorescence, delayed fluorescence, and thermally activated delayed fluorescence (TADF).
Innovation Solution
Incorporating a polycyclic compound represented by specific formulas into the emission layer of an organic electroluminescence device, which facilitates thermally activated delayed fluorescence, improving the device's efficiency and lifespan by enhancing emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphorescence emission or delayed fluorescence emission techniques are used to improve emission efficiency, then the emission efficiency increases, but the device complexity and material development difficulty increase
Solution Approach 1:
The patent modifies molecular parameters by introducing specific heteroatoms (B, N, P=O, P=S) and substituent groups into the polycyclic compound structure to optimize emission efficiency while maintaining manageable device complexity
Solution Approach 2:
The patent employs composite material strategies by combining polycyclic compounds with heteroatom-containing groups and various substituent groups to achieve enhanced emission efficiency through synergistic effects
2Reliability
If conventional materials are used in the emission layer, then the device structure remains simple, but the external quantum efficiency and device lifespan are insufficient
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (heteroatoms Y1-Y3 and substituent groups R1-R12) at particular positions within the polycyclic compound structure to enhance device lifespan and external quantum efficiency without requiring complete structural redesign
Solution Approach 2:
The patent changes molecular parameters by varying heteroatom types, substituent groups, and their positions to optimize both device performance and structural manageability
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 use of the polycyclic compound in the emission layer leads to improved external quantum efficiency and extended device life, particularly in the deep blue wavelength region, outperforming comparative examples by enhancing emission intensity and electron push-pull effects.
Implementation Method 1
Incorporating a polycyclic compound represented by specific formulas into the emission layer of an organic electroluminescence device, which facilitates thermally activated delayed fluorescence
Data Source
AI summary
An organic electroluminescence device of one or more embodiments includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer and a second electrode disposed on the electron transport region, wherein the emission layer includes a polycyclic compound represented by Formula 1, thereby showing high emission efficiency:wherein at least one of n1 to n6 is 1.