Fused Polycyclic Boron Compound for OLED Emission Efficiency

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Solution Overview

Problem

Current organic electroluminescence devices face challenges in achieving low driving voltage, high emission efficiency, and long service life, particularly in stabilizing these characteristics for effective display applications.

Innovation Solution

A light emitting element incorporating a fused polycyclic compound, specifically designed with a structure that includes multiple aromatic rings fused via a boron atom and heteroatoms, is used in the emission layer to enhance emission efficiency and element lifetime, utilizing a compound represented by various formulas that define specific substituents and ring configurations to promote radiative decay and prevent structural deterioration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic electroluminescence materials are used, then device structure can be maintained, but emission efficiency and service life are insufficient

Engineering Contradiction:

Improveemission efficiencyVSAvoidservice life

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the molecular structure parameters of the organic compound by introducing a specific fused polycyclic core structure with boron atom and heteroatoms, along with defined substituent patterns (R1-R7, n1-n7), to simultaneously improve emission efficiency and service life beyond conventional materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite molecular structure combining multiple aromatic rings fused via boron atom and heteroatoms (O, S, or N), with various substituent groups, to achieve enhanced performance characteristics that neither simple compounds nor conventional materials can provide

Inventive Principle:

Principle #40Composite materials

2Productivity

If triplet exciton concentration is increased to improve emission, then emission efficiency may improve, but structural deterioration accelerates

Engineering Contradiction:

Improveemission efficiencyVSAvoidstructural stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent converts the potentially harmful effect of triplet exciton concentration into a beneficial mechanism by designing the molecular structure to promote reverse intersystem crossing, where triplet excitons are transformed back to singlet excitons that can radiatively decay, thus improving emission efficiency while preventing structural deterioration

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The specific molecular structure parameters (fused polycyclic core, boron atom, heteroatoms, substituent patterns) are optimized to control the balance between triplet exciton generation and reverse intersystem crossing, ensuring high emission efficiency without compromising structural stability

Inventive Principle:

Principle #35Parameter changes

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 significantly improves emission efficiency and extends the lifetime of the light emitting element by preventing triplet exciton concentration-induced degradation and promoting reverse intersystem crossing, leading to enhanced thermally activated delayed fluorescence properties and blue light emission with high color purity.

Implementation Method 1

promoting reverse intersystem crossing, leading to enhanced thermally activated delayed fluorescence properties

Methodology Applied

Scientific EffectReverse intersystem crossing:

Implementation Method 2

enhanced thermally activated delayed fluorescence properties and blue light emission with high color purity

Methodology Applied

Scientific EffectThermally activated delayed fluorescence:

Implementation Method 3

promote radiative decay and prevent structural deterioration

Methodology Applied

Scientific EffectRadiative decay:

Implementation Method 4

an organic electroluminescence display is a so-called a self-luminescent display 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 including an organic compound in the emission layer emits light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20240334828A1Light emitting element and fused polycyclic compound for the light emitting element

Publication Date: 2024.10.03 SAMSUNG DISPLAY CO LTD

AI summary

Embodiments provide a fused polycyclic compound, a light emitting element that includes the fused polycyclic compound, and an electronic device that includes the light emitting element. The light emitting element 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 and including the fused polycyclic compound. The fused polycyclic compound is represented by Formula 1, which is explained in the specification: