Polycyclic Compound Light Emitting Element Efficiency Lifespan
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Solution Overview
Problem
Existing organic electroluminescence display devices face challenges in achieving high luminous efficiency and lifespan for light emitting elements.
Innovation Solution
A light emitting element is designed with a specific structure including a first electrode, a hole transport region, a light emitting layer containing a polycyclic compound represented by Formula 1, an electron transport region, and a second electrode. This structure enhances luminous efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional light emitting materials are used in organic electroluminescence display devices, then the device can operate and display images, but the luminous efficiency and lifespan are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of the light emitting material by introducing specific substituents (carbazole groups, phenyl groups, and fluorine atoms) at defined positions in the polycyclic compound framework. This structural parameter change optimizes the HOMO-LUMO energy levels and improves charge carrier transport properties, directly enhancing luminous efficiency while the stable polycyclic core structure ensures long operational lifespan
Solution Approach 2:
The patent employs composite material strategy by combining the polycyclic compound (Formula 1) with specific host materials and dopants in the light emitting layer. The compound is used at controlled concentrations (0.1-10 wt%) within a host matrix, creating a composite system that leverages the high efficiency of the dopant while the host material provides structural stability and extended lifespan through efficient energy transfer and reduced degradation
2Reliability
If the light emitting layer uses simple organic compounds, then the manufacturing process is simple, but the luminous efficiency and lifespan cannot be improved
Solution Approach 1:
The patent applies local quality principle by introducing specific functional groups (carbazole, phenyl, fluorine) at strategic positions within the polycyclic compound structure. The core polycyclic framework provides structural stability for long lifespan, while the localized substituents at specific positions (R1-R6, Z1-Z6) optimize electronic properties and charge transport for enhanced efficiency, achieving both goals through spatially differentiated structural design
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 solution improves luminous efficiency and extends the lifespan of light emitting elements, thereby enhancing the performance of organic electroluminescence display devices.
Implementation Method 1
a so-called self-luminescent light emitting element in which holes and electrons respectively injected from a first electrode and a second electrode recombine in a light emitting layer, so that a light emitting material in the light emitting layer emits light
Data Source
AI summary
Embodiments provide a polycyclic compound, a light emitting element including the polycyclic compound, and a display device including the light emitting element. The light emitting element includes a first electrode, a second electrode disposed on the first electrode, and a light emitting layer disposed between the first electrode and the second electrode. The light emitting layer includes a polycyclic compound represented by Formula 1, which is explained in the specification: