Fused Polycyclic Delayed Fluorescence Dopant for OLED Efficiency

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Solution Overview

Problem

Current organic electroluminescence devices face challenges in reducing driving voltage, enhancing emission efficiency, and extending lifespan, particularly in utilizing luminescent materials that effectively harness triplet and singlet excitons for improved performance.

Innovation Solution

A light emitting device incorporating a novel fused polycyclic compound as a luminescent material, specifically designed to improve luminous efficiency and device service life by utilizing a host and delayed fluorescence dopant in the emission layer, which includes a compound represented by Formula 1, facilitating efficient energy transfer and stability through its structural configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional luminescent materials are used in organic electroluminescence devices, then the device can operate, but the luminous efficiency and device service life are insufficient

Engineering Contradiction:

Improveluminous efficiencyVSAvoiddevice service life

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the molecular structure of luminescent materials by introducing specific fused polycyclic frameworks with heteroatoms (B, N, P, O, S) at defined positions. This structural parameter change enables simultaneous improvement in luminous efficiency and device service life through optimized exciton management and enhanced material stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs composite luminescent materials combining fused polycyclic core structures with various substituent groups (aryl, heteroaryl, alkyl, amine, oxy, silyl, boron, phosphine groups). This composite approach allows tuning of electronic properties to achieve both high luminous efficiency and extended device service life.

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If phosphorescence emission techniques are used to improve efficiency, then triplet state energy is utilized, but the device complexity and material stability challenges increase

Engineering Contradiction:

Improveenergy utilization efficiencyVSAvoidmaterial system complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent introduces specific heteroatoms (B, N, P, O, S) at predetermined positions within the fused polycyclic structure to create localized regions with distinct electronic properties. This local quality modification enables selective management of singlet and triplet excitons, improving energy utilization while maintaining structural clarity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The fused polycyclic luminescent materials are designed to self-manage exciton energy through their inherent molecular structure, eliminating the need for complex auxiliary systems. The materials autonomously facilitate efficient energy transfer and minimize quenching phenomena, reducing overall device complexity.

Inventive Principle:

Principle #25Self-service

3Use of energy by moving object

If delayed fluorescence emission techniques are used, then singlet excitons are generated through triplet-triplet annihilation, but the device complexity and control difficulty increase

Engineering Contradiction:

Improveenergy conversion efficiencyVSAvoiddevice control ease

Core Design Contradiction:

Use of energy by moving objectVSEase of operation

Solution Approach 1:

The patent pre-configures the fused polycyclic luminescent materials with specific molecular structures that inherently facilitate triplet-triplet annihilation and singlet exciton generation. This preliminary structural design enables efficient delayed fluorescence emission without requiring complex external control mechanisms, simplifying device operation.

Inventive Principle:

Principle #10Preliminary action

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 implementation of the fused polycyclic compound in the light emitting device enhances luminous efficiency and extends the service life by effectively managing exciton energy and preventing quenching phenomena, leading to improved performance and material stability.

Implementation Method 1

facilitating efficient energy transfer and stability through its structural configuration

Methodology Applied

Scientific EffectEnergy transfer:

Implementation Method 2

a luminescent material including an organic compound in the emission layer emits light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

effectively managing exciton energy and preventing quenching phenomena

Methodology Applied

Scientific EffectExciton management:

Implementation Method 4

a host and delayed fluorescence dopant in the emission layer

Methodology Applied

Scientific EffectDelayed fluorescence:

Data Source

PatentUS20230120766A1Fused polycyclic compound and light emitting device including the same

Publication Date: 2023.04.20 SAMSUNG DISPLAY CO LTD

AI summary

A light emitting device includes an emission layer disposed between electrodes. The emission layer includes a host and a delayed fluorescence dopant. The delayed fluorescence dopant includes a fused polycyclic compound represented by Formula 1: