Organic Electroluminescence Compound for High Luminous Efficiency
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in achieving high luminous efficiency due to limitations in the materials used for the emitting layer.
Innovation Solution
A new compound with specific structural formulas is introduced, which can be used in the emitting layer of organic electroluminescence devices, enhancing luminous efficiency by optimizing the organic layer structure between the cathode and anode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional materials are used for the emitting layer, then the device structure is simple, but the luminous efficiency is low
Solution Approach 1:
The patent employs composite material strategy by combining the new compound (formula 1) with specific host materials (formula 2-4) and dopant materials (formula 5-7) to create an optimized emitting layer. This composite approach achieves high luminous efficiency (60 cd/A or more) by synergistically combining materials with complementary properties: the new compound provides high quantum yield and appropriate energy levels, while host materials provide effective charge transport and dopant materials provide phosphorescent emission with high quantum yield (80% or more).
Solution Approach 2:
The patent applies parameter changes by precisely controlling the molecular structure parameters of the emitting layer compound (formula 1) with specific ring structures (A, B, C, D) and substituents (R1-R8) to achieve optimal HOMO/LUMO energy levels. This structural parameter optimization enables effective electron-hole recombination and high quantum yield, directly improving luminous efficiency without requiring complex device architecture.
2Productivity
If the organic layer structure is optimized for high luminous efficiency, then the luminous efficiency improves, but the material selection and layer design become more complex
Solution Approach 1:
The patent applies local quality principle by designing the emitting layer compound (formula 1) with specific local structural features: rings A and D are heterocyclic rings (pyridine, pyrimidine, triazine) that provide electron-transporting capability, while rings B and C are aromatic hydrocarbon rings that provide hole-transporting capability. This localized functional differentiation within the molecule achieves balanced charge transport and high quantum yield, improving luminous efficiency through molecular-level design rather than complex device structure.
Solution Approach 2:
The new compound (formula 1) exhibits multi-functionality by simultaneously serving as: (1) the emitting layer material enabling electron-hole recombination, (2) the charge transport medium, and (3) the host for phosphorescent dopants. This universal material performs multiple functions that would traditionally require separate layers, simplifying the overall device structure while achieving high luminous efficiency through a single optimized compound.
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 new compound significantly improves the luminous efficiency of organic electroluminescence devices by optimizing the organic layer structure, leading to enhanced performance.
Implementation Method 1
When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined in the emitting layer, and excitons are formed therein.
Data Source
AI summary
A compound having a structure represented by the following formulas (a) and (b):wherein, in the formulas (a) and (b), a ring A, a ring B, a ring C and a ring D are independently a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic ring having 5 to 50 ring atoms; two or more of the ring A, the ring B, the ring C and the ring D are a heterocyclic ring; and each of sites *a, *b, *c and *d in the formula (a) and the formula (b) represents a position of an atom, and the atoms located in the sites *a, *b,*c and *d form one substituted or unsubstituted and saturated or unsaturated six-membered ring including four atoms thereof.