Polycyclic Compound Emission Layer for OLED Service Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life for light emitting elements.
Innovation Solution
A light emitting element is designed with a polycyclic compound, specifically a compound represented by Formula 1, which is used in the emission layer, along with other compounds like those represented by Formulas HT-1, ET-1, or M-b, to form functional layers that enhance the device's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional organic electroluminescence materials are used, then the device can achieve basic light emission, but the service life is limited and performance stability is insufficient
Solution Approach 1:
The patent employs composite material strategy by combining the polycyclic compound (Formula 1) with host compounds (Formulas HT-1, ET-1, or M-b) to create a emission layer composite system. This composite approach allows the polycyclic compound to provide long service life while the host compounds ensure performance stability and efficient energy transfer, resolving the contradiction between extended duration and reliable performance.
Solution Approach 2:
The patent applies parameter changes by modifying the molecular structure of the emission layer material through the specific polycyclic compound design in Formula 1, where substituents R1-R10 and parameters n1 can be varied to optimize performance. This structural parameter optimization enables simultaneous improvement of service life and performance stability.
2Productivity
If the emission layer uses simple materials, then the device structure remains simple, but luminous efficiency and service life cannot be simultaneously optimized
Solution Approach 1:
The emission layer is constructed as a composite system combining the polycyclic guest compound (Formula 1) with host compounds (Formulas HT-1, ET-1, or M-b). This composite structure enables high luminous efficiency through effective energy transfer from host to guest, while the modular design maintains reasonable device complexity by using well-established host material frameworks.
Solution Approach 2:
The host compounds act as intermediaries that facilitate efficient energy transfer to the polycyclic emission compound. The host materials absorb electrical energy and transfer it to the guest compound, which then emits light. This intermediary mechanism achieves high luminous efficiency without requiring direct electrical-to-optical conversion in the emission layer material itself.
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 solution results in a light emitting element with improved service life and efficiency, achieving stable performance and prolonged operation.
Implementation Method 1
The organic electroluminescence display device includes 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 an emission layer, so that a luminescent material in the emission layer emits light
Data Source
AI summary
Embodiments provide a polycyclic compound and a light emitting element that includes the polycyclic compound. The light emitting element 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, wherein the at least one functional layer includes the polycyclic compound, which is represented by Formula 1. Formula 1 is defined in the specification. The light emitting element exhibits a long service life.