Fused Polycyclic Compounds for OLED Light Efficiency and Service Life
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Solution Overview
Problem
Existing organic electroluminescence display devices face challenges in achieving improved light efficiency and service life for light emitting elements.
Innovation Solution
Incorporation of a fused polycyclic compound represented by specific chemical formulas in the emission layer of light emitting elements, along with additional compounds, to enhance light efficiency and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic electroluminescence materials are used in the emission layer, then the device structure remains simple, but light efficiency and service life are insufficient
Solution Approach 1:
The emission layer employs a composite material system consisting of a host compound and a fused polycyclic dopant compound. The host compound provides the structural framework while the dopant compound (Formula 1) with specific fused polycyclic structure (containing nitrogen and boron atoms in a five-membered ring) enhances light efficiency and service life. This composite approach resolves the contradiction by achieving improved reliability through material composition optimization without fundamentally altering the device structure.
Solution Approach 2:
The invention optimizes specific molecular parameters of the dopant compound, including the fused polycyclic core structure with nitrogen and boron atoms, and adjustable substituent groups (R1-R7, Ra-Rb, Rd1-Rd5). By systematically varying these chemical parameters while maintaining the core fused polycyclic structure, the invention achieves improved light efficiency and service life, resolving the contradiction between performance improvement and structural simplicity.
2Use of energy by moving object
If conventional emission materials are used, then the manufacturing process remains simple, but light efficiency is insufficient
Solution Approach 1:
The invention modifies the chemical parameters of the emission materials by introducing a fused polycyclic dopant compound with specific structural features (nitrogen and boron atoms in five-membered ring, adjustable substituents R1-R7). These parameter changes enhance light efficiency through improved molecular properties while maintaining compatibility with conventional manufacturing processes, thus resolving the contradiction between light efficiency and ease of manufacture.
Solution Approach 2:
The dopant compound uses commonly available organic chemical building blocks (aromatic rings, nitrogen-containing groups, boron compounds) that can be synthesized through standard organic chemistry procedures. This approach enables high light efficiency without requiring complex or expensive manufacturing processes, resolving the contradiction between performance and manufacturing simplicity.
3Duration of action of stationary object
If existing emission layer materials are used, then the device structure remains straightforward, but service life is limited
Solution Approach 1:
The emission layer uses a composite material system where the host compound and fused polycyclic dopant compound work synergistically. The dopant's specific structure (five-membered ring with nitrogen and boron atoms) provides enhanced stability and longevity, extending service life while maintaining a relatively simple overall device structure. This resolves the contradiction between extended service life and structural simplicity.
Solution Approach 2:
The invention extracts and isolates the critical functional elements needed for improved service life into the dopant compound's core structure (the fused polycyclic system with nitrogen and boron). By concentrating the service-life-enhancing properties in this specific molecular framework rather than complicating the overall device architecture, the invention resolves the contradiction between service life extension and device complexity.
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 fused polycyclic compound improves the light efficiency and service life of the light emitting elements, leading to more effective display performance.
Implementation Method 1
The organic electroluminescence display device includes so-called a self-luminescent light emitting element in which holes and electrons respectively injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material of the emission layer emits light
Data Source
AI summary
Embodiments provide a fused polycyclic compound, a light emitting element that includes the fused polycyclic compound, and a display device that includes the light emitting element. The 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, wherein the emission layer includes the fused polycyclic compound. The fused polycyclic compound is represented by Formula 1, which is explained in the specification.