Fused Polycyclic Compound Host for OLED Light Efficiency
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Solution Overview
Problem
Current light emitting elements in organic electroluminescence display devices face challenges in achieving high light efficiency, necessitating the development of materials that can stabilize and enhance light emission characteristics.
Innovation Solution
A light emitting element comprising a first electrode, a second electrode, and an emission layer with a specific fused polycyclic compound, which includes a tetrabenzo azonine derivative, is used to increase light efficiency by preventing intermolecular interactions and promoting suitable light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional materials are used in the emission layer, then the device structure can be kept simple, but light efficiency is insufficient
Solution Approach 1:
The emission layer employs a composite material system comprising a fused polycyclic compound (Formula 1) as host material combined with specific dopant materials (Formulae 3-1 to 3-6). This composite approach leverages the high light efficiency and stable LUMO energy level of the fused polycyclic host together with the appropriate dopants to achieve enhanced overall light efficiency while maintaining controlled device structure
Solution Approach 2:
The patent utilizes parameter changes in the molecular structure of the fused polycyclic compound, specifically varying the substituents R1 to R9 and the heteroatom X1 (N or O), to optimize the LUMO energy level and light efficiency characteristics. This allows tuning of the emission layer properties to achieve high light efficiency without fundamentally changing the device architecture
2Use of energy by moving object
If the emission layer uses materials with high light efficiency, then light efficiency improves, but driving voltage increases
Solution Approach 1:
The patent optimizes the LUMO energy level parameter of the fused polycyclic compound (Formula 1) to achieve a balance between light efficiency and driving voltage. By carefully selecting substituents R1 to R9 and heteroatoms X1, the LUMO energy level is tuned to enable efficient electron injection and transport, achieving high light efficiency while controlling the driving voltage within acceptable ranges
3Duration of action of stationary object
If conventional emission materials are used, then the device can operate, but lifespan is limited
Solution Approach 1:
The emission layer uses a composite material system where the fused polycyclic compound (Formula 1) serves as a stable host material with appropriate HOMO and LUMO energy levels, combined with specific dopant materials. This composite structure provides both the stability needed for long lifespan and the optical properties required for high light efficiency, as the host-guest interaction enables efficient energy transfer while the molecular structure ensures operational stability
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 fused polycyclic compound in the emission layer enhances light efficiency and reduces driving voltage, while increasing the lifespan of the light emitting element, resulting in improved display performance.
Implementation Method 1
holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material in the emission layer emits light
Data Source
AI summary
A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and an emission layer disposed between the first electrode and the second electrode. The emission layer may include a first compound and at least one of a second compound or a third compound. The first compound may be represented by Formula 1, the second compound may be represented by Formula HT-1, and the third compound may be represented by Formula ET-1. Accordingly, a light emitting element of an embodiment may exhibit excellent or suitable light efficiency.