Polycyclic Compound Delayed Fluorescence LED Efficiency
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long lifespan for light emitting diodes, with existing materials failing to consistently meet these requirements.
Innovation Solution
A light emitting diode incorporating a polycyclic compound represented by Formula 1, which is used in the emission layer, enhancing luminous efficiency and lifespan by facilitating delayed fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in the emission layer, then the device structure remains simple, but luminous efficiency and lifespan are insufficient
Solution Approach 1:
The patent employs composite material strategy by combining the polycyclic compound (Formula 1) with host materials and dopants in the emission layer. This composite approach achieves high luminous efficiency and extended lifespan through synergistic effects, resolving the contradiction between improved reliability and material structure complexity.
Solution Approach 2:
The invention utilizes parameter changes by optimizing the molecular structure of the polycyclic compound (Formula 1) with specific substituents (R1-R3, M1, M2, T1, T2) to achieve desired photophysical properties. This structural parameter optimization enables high efficiency and long lifespan while maintaining reasonable material complexity.
2Use of energy by moving object
If phosphorescence emission or TADF materials are used to improve luminous efficiency, then energy utilization increases, but material stability and lifespan remain challenging
Solution Approach 1:
The polycyclic compound (Formula 1) exhibits self-service capability through its intrinsic delayed fluorescence mechanism, where the molecule itself generates singlet excitons via triplet-triplet annihilation without requiring heavy metal dopants or complex host-guest systems. This self-sufficient approach achieves high luminous efficiency while maintaining material stability.
Solution Approach 2:
The invention converts the typically harmful triplet excitons (which cause material degradation) into beneficial singlet excitons through triplet-triplet annihilation. This transforms a harmful factor into a useful mechanism for generating delayed fluorescence, achieving high efficiency while improving material stability.
3Productivity
If complex emission mechanisms are implemented to achieve high luminous efficiency, then energy conversion improves, but device reliability and operational stability deteriorate
Solution Approach 1:
The patent extracts and utilizes only the essential delayed fluorescence mechanism from complex emission systems, eliminating the need for heavy metal phosphorescent materials and complex multi-component systems. This extraction of the core mechanism achieves high luminous efficiency while simplifying the system for improved 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 polycyclic compound improves the light emitting diode's efficiency and lifespan by emitting delayed fluorescence, achieving high luminous efficiency and extended operational life.
Implementation Method 1
technologies pertaining to phosphorescence emission using triplet state energy or delayed fluorescence using triplet-triplet annihilation (TTA) in which singlet excitons are generated by collision of triplet excitons
Implementation Method 2
delayed fluorescence using triplet-triplet annihilation (TTA) in which singlet excitons are generated by collision of triplet excitons
Implementation Method 3
The organic electroluminescence display device is a so-called self-luminescent display device in which holes and electrons respectively injected from a first electrode and a second electrode recombine in an emission layer, so that a luminescent material in the emission layer emits light
Data Source
AI summary
A light emitting diode includes a first electrode, a second electrode disposed on the first electrode, and at least one functional layer disposed between the first electrode and the second electrode. The at least one functional layer includes a compound represented by Formula 1, thereby exhibiting high efficiency and long lifespan.