Polycyclic Boron-Nitrogen Compound for OLED Emission Layer
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high emission efficiency, and long service life due to limitations in materials used for light emitting elements.
Innovation Solution
A light emitting element is developed with a polycyclic compound in the emission layer, specifically designed with a fused ring core containing a boron atom and two nitrogen atoms, and substituents like dibenzofuran or carbazole groups to enhance emission efficiency and device life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in the emission layer, then the device structure is simple, but the emission efficiency and service life are insufficient
Solution Approach 1:
The patent employs composite material design by incorporating a polycyclic compound with a fused ring core containing boron and nitrogen atoms, combined with specific substituent groups (dibenzofuran or carbazole). This composite molecular structure achieves both high emission efficiency and extended service life, resolving the contradiction between reliability improvement and structural complexity.
Solution Approach 2:
The patent modifies molecular parameters by introducing specific heteroatoms (boron, nitrogen) and substituent groups into the core structure. These parameter changes in the molecular composition and configuration enable simultaneous improvement of emission efficiency and device stability, addressing the technical contradiction between performance enhancement and material complexity.
2Productivity
If conventional materials are used in the emission layer, then the material selection is simple, but the emission efficiency is insufficient
Solution Approach 1:
The patent utilizes composite material strategy by designing a polycyclic compound that integrates a fused ring core with boron and nitrogen atoms plus dibenzofuran or carbazole substituents. This composite structure achieves high emission efficiency while maintaining reasonable structural complexity, resolving the contradiction between productivity improvement and device complexity.
Solution Approach 2:
The patent applies local quality principle by introducing specific functional groups (dibenzofuran or carbazole) at particular positions on the molecular structure. These localized structural modifications enhance emission efficiency without requiring complete redesign of the entire molecular framework, thus balancing performance improvement with structural complexity.
3Reliability
If existing materials are used, then the device design is straightforward, but both emission efficiency and service life are limited
Solution Approach 1:
The patent modifies material parameters by incorporating boron and nitrogen atoms in specific configurations within the fused ring core, along with electron-donating substituent groups. These parameter changes in molecular electronics enable the material to achieve both long service life and reduced driving voltage requirements, resolving the contradiction between reliability and energy consumption.
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 this polycyclic compound in the emission layer results in improved emission efficiency and extended service life of the light emitting element, addressing the limitations of existing materials.
Implementation Method 1
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 light emitting material in the emission layer emits light
Data Source
AI summary
Embodiments provide light emitting element which 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 a polycyclic compound represented by Formula 1, which is explained in the specification: