Binaphthyl Organic Compound for Balanced Charge Injection in OLEDs
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Solution Overview
Problem
Organic light-emitting diodes (OLEDs) and Quantum Dot Light Emitting Diodes (QLEDs) face limitations in achieving high luminous efficiency and color gamut due to surface defects, charge imbalance, and the need for compatible solvents in the solution process, which restricts the choice of luminous materials and charge transporters.
Innovation Solution
An organic compound with a specific structure, capable of balanced charge injection and having a deep Highest Occupied Molecular Orbital (HOMO) energy level, is introduced into the hole transfer layer, allowing for efficient hole mobility and luminescence without quenching, enabling the use of a solution process and reducing driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a solution process is used to form multiple laminated films in OLED/QLED, then manufacturing efficiency is improved, but solvent compatibility becomes limited causing material mixing at interfaces
Solution Approach 1:
The patent introduces a charge transport layer as an intermediary between adjacent emissive layers with different solvent requirements. This intermediate layer acts as a barrier that prevents direct contact and mixing between incompatible materials, while still allowing the solution process to proceed for all layers. The charge transport layer mediates the interface between layers that would otherwise be incompatible due to solvent conflicts.
2Illumination intensity
If current density is increased to improve luminance in OLED, then luminance performance is improved, but luminous life span becomes shorter due to thermal degradation
Solution Approach 1:
The patent modifies the energy level parameters of the organic compound in the charge transport layer, specifically creating a deep HOMO energy level. This parameter change enables more efficient charge transport and reduces the current density required to achieve the same luminance, thereby reducing thermal degradation and extending device life span while maintaining luminance performance.
3Adaptability or versatility
If multiple emissive layers with different solvents are formed through solution process, then manufacturing flexibility is improved, but interface mixing occurs reducing material stability
Solution Approach 1:
The charge transport layer serves as a protective intermediary between adjacent emissive layers. It prevents direct interaction between materials with different solvent compatibilities, thereby maintaining the stability and integrity of each emissive layer's composition while still allowing the manufacturing process to use different solvents for different layers.
Data Source
AI summary
The present disclosure relates to an organic compound having a binaphthyl core and a group connected to the biphenyl core and having excellent charge mobility property, and a light emitting diode and a light emitting device having the organic compound. The organic compound can be applied into the light emitting diode by using solution process and has very deep HOMO energy level. When the organic compound is applied into a chare transfer layer, a HOMO energy level bandgap between the charge transfer layer and an emitting material layer is reduced so that holes and electrons can be injected into the emitting material layer in a balanced manner.