Polycyclic Borepine Compound for OLED Emission Efficiency

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Solution Overview

Problem

Current organic electroluminescence devices face challenges in reducing driving voltage, enhancing emission efficiency, and extending device life, particularly in achieving high efficiency through phosphorescence or delayed fluorescence methods.

Innovation Solution

Incorporating a polycyclic compound with a borepine core and specific electron donors and acceptors, such as phenyl groups with cyano substituents, into the emission layer to facilitate delayed fluorescence and improve electron transfer, thereby reducing driving voltage and increasing efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic electroluminescence materials are used, then device structure is simple, but emission efficiency is low and device life is short

Engineering Contradiction:

Improveemission efficiencyVSAvoiddevice structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs composite materials by combining the polycyclic compound (containing borepine core with electron donors and acceptors) with host materials and dopants to create an emission layer with superior emission efficiency. This composite approach allows the device to achieve high efficiency without fundamentally changing the overall device structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the chemical and electronic parameters of the emission layer by introducing the polycyclic compound with specific electron donors and acceptors. This modifies the energy levels, charge transport properties, and emission characteristics, enabling high efficiency while maintaining device structural simplicity.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If phosphorescence emission or TADF materials are used to achieve high efficiency, then emission efficiency improves, but device complexity increases

Engineering Contradiction:

Improveemission efficiencyVSAvoidmaterial structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges multiple functional components (electron donors, electron acceptors, and luminescent units) into a single polycyclic compound molecule. This integration achieves the complex functionality of phosphorescence or TADF materials while simplifying the overall material structure and device fabrication.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The polycyclic compound acts as a composite material integrating electron transfer pathways and luminescent centers, achieving high emission efficiency through internal molecular design rather than requiring complex external device structures or multiple separate material layers.

Inventive Principle:

Principle #40Composite materials

3Use of energy by moving object

If driving voltage is reduced to improve energy efficiency, then energy consumption decreases, but emission efficiency may be compromised

Engineering Contradiction:

Improveenergy consumptionVSAvoidemission efficiency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent changes the energy level parameters and charge transport properties of the emission layer through the polycyclic compound, enabling efficient charge injection and recombination at low voltages. The compound's electron donors and acceptors facilitate balanced charge transport, maintaining high emission efficiency even at reduced driving voltages.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces high-voltage electrical injection with low-voltage injection facilitated by the molecular design of the polycyclic compound. The electron donors and acceptors within the molecule create internal fields and pathways that enable efficient charge transport without requiring high external voltage.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 the polycyclic compound in the organic electroluminescence device leads to a low driving voltage and high emission efficiency, enabling improved device performance with thermally activated delayed fluorescence.

Implementation Method 1

thermally activated delayed fluorescence (TADF) materials using delayed fluorescence phenomenon

Methodology Applied

Scientific EffectThermally activated delayed fluorescence: Fluorescence

Implementation Method 2

delayed fluorescence emission using triplet-triplet annihilation (TTA) in which singlet excitons are generated by the collision of triplet excitons

Methodology Applied

Scientific EffectTriplet-triplet annihilation:

Data Source

PatentUS11569457B2Organic electroluminescence device and polycyclic compound for organic electroluminescence device

Publication Date: 2023.01.31 SAMSUNG DISPLAY CO LTD

AI summary

An organic electroluminescence device of an embodiment includes a first electrode, a second electrode and a plurality of organic layers disposed between the first electrode and the second electrode, in which at least one of the organic layers includes a polycyclic compound including a plurality of electron donors and an electron acceptor connecting the electron donors, at least one of the electron donors is a condensed ring including a borepine core, and the electron acceptor includes a phenyl group including, as a substituent, at least one cyano group or a heterocycle including at least one nitrogen atom, or a heteroaryl group including an oxygen atom or a sulfur atom for forming a ring, thereby achieving improved emission efficiency.