Fused Polycyclic Compound for OLED Emission Efficiency

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Solution Overview

Problem

Existing organic electroluminescence devices face challenges in reducing driving voltage, enhancing emission efficiency, and increasing lifespan.

Innovation Solution

Incorporating a fused polycyclic compound represented by Formula 1 into at least one organic layer of the device, specifically in the emission layer, to improve emission efficiency through delayed fluorescence emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic electroluminescence devices are used, then the device structure is simple, but the emission efficiency is low

Engineering Contradiction:

Improveemission efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces a fused polycyclic compound with specific molecular structure parameters (Formula 1) that enables delayed fluorescence emission. By changing the chemical composition parameters of the emission layer to include this compound at 1-50 wt%, the device achieves higher emission efficiency through triplet exciton utilization without requiring complex structural modifications.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite emission layer by combining the fused polycyclic compound (as dopant) with a host material. This composite material approach allows the emission layer to utilize both singlet and triplet excitons through the dopant-host energy transfer mechanism, achieving enhanced emission efficiency while maintaining a relatively simple device structure.

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If conventional organic electroluminescence devices are used, then the device is easy to manufacture, but the lifespan is short

Engineering Contradiction:

ImprovelifespanVSAvoidease of manufacture

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent modifies the chemical composition parameters of the emission layer by incorporating the fused polycyclic compound, which improves device lifespan by enabling more efficient energy utilization. The compound's specific molecular structure (Formula 1) provides stable delayed fluorescence emission that reduces degradation, while the material can be introduced using standard vacuum deposition techniques without complicating the manufacturing process.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If conventional organic electroluminescence devices are used, then the driving voltage is maintained, but the emission efficiency is low

Engineering Contradiction:

Improveemission efficiencyVSAvoidenergy utilization

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent converts the previously harmful or wasted triplet excitons (which typically lead to non-radiative decay) into beneficial light-emitting states through delayed fluorescence. The fused polycyclic compound acts as a dopant that captures triplet excitons and converts them to singlet states that can emit light, thereby converting energy that would have been lost into useful emission while maintaining the same driving voltage.

Inventive Principle:

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

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 fused polycyclic compound leads to improved emission efficiency and potentially longer lifespan of the organic electroluminescence device, while maintaining comparable driving voltage.

Implementation Method 1

Methodology Applied

Scientific EffectDelayed fluorescence emission: Fluorescence

Data Source

PatentUS20250160196A1Organic electroluminescence device and fused polycyclic compound for organic electroluminescence device

Publication Date: 2025.05.15 SAMSUNG DISPLAY CO LTD

AI summary

An organic electroluminescence device of an embodiment includes oppositely disposed first electrode and second electrode, and a plurality of organic layers disposed between the first electrode and the second electrode, wherein at least one from among the organic layers includes a fused polycyclic compound represented by Formula 1 below, thereby showing improved emission efficiency.