OLED Interlayer Composition for Exciplex-Driven Efficiency and Lifespan

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Solution Overview

Problem

Existing light-emitting devices face challenges in achieving high luminescence efficiency and long lifespan while maintaining excellent characteristics such as wide viewing angles, high contrast ratios, and fast response times.

Innovation Solution

Incorporating an interlayer in the light-emitting device that includes specific compounds represented by Formulas 1, 2, and 3, which are designed to enhance the emission layer's performance through the use of π electron-deficient nitrogen-containing C1-C60 cyclic groups and compounds capable of emitting delayed fluorescent light, forming exciplexes to improve luminescence efficiency and lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional emission layers are used in light-emitting devices, then device structure is simple, but luminescence efficiency and lifespan are insufficient

Engineering Contradiction:

ImprovelifespanVSAvoidinterlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces an interlayer comprising specific compounds (Formula 1, Formula 2, or Formula 3) as an intermediary between electrodes and emission layer. This interlayer mediates charge transport and facilitates exciplex formation, thereby extending device lifespan while managing the added structural complexity through targeted molecular design.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs composite material strategies by combining specific compounds (Formula 1 with nitrogen-containing cyclic groups, Formula 2 with delayed fluorescent properties, or Formula 3) to create an interlayer with synergistic properties. This composite approach enhances luminescence efficiency and lifespan while controlling overall device complexity.

Inventive Principle:

Principle #40Composite materials

2Productivity

If emission layer alone is optimized, then device structure is simple, but luminescence efficiency is limited

Engineering Contradiction:

Improveluminescence efficiencyVSAvoidinterlayer composition

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The interlayer acts as a mediator that enhances energy transfer to the emission layer. Compounds in the interlayer (Formula 1, 2, or 3) are specifically designed to facilitate this energy transfer process, thereby improving luminescence efficiency without requiring complex modifications to the emission layer itself.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent optimizes luminescence efficiency by changing molecular parameters of the interlayer compounds, such as introducing nitrogen-containing cyclic groups in Formula 1, delayed fluorescent properties in Formula 2, or specific structural features in Formula 3. These parameter changes enhance energy transfer efficiency while keeping the overall device structure manageable.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If high luminescence efficiency is achieved through complex compounds, then lifespan is improved, but manufacturing complexity increases

Engineering Contradiction:

ImprovelifespanVSAvoidcompound synthesis

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent achieves improved lifespan through controlled parameter changes in compound structures (Formula 1, 2, or 3) rather than introducing overly complex molecular architectures. The nitrogen-containing cyclic groups in Formula 1, delayed fluorescent properties in Formula 2, and specific structural features in Formula 3 represent targeted parameter optimizations that balance performance enhancement with manufacturability.

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 results in a light-emitting device with enhanced luminescence efficiency and extended lifespan, maintaining high brightness and fast response times, while also improving color purity and overall device performance.

Implementation Method 1

the interlayer may include: i) a first compound represented by Formula 1; and ii) a second compound including at least one π electron-deficient nitrogen-containing C1-C60 cyclic group

Methodology Applied

Scientific EffectExciplex formation:

Implementation Method 2

designed to enhance the emission layer's performance through the use of π electron-deficient nitrogen-containing C1-C60 cyclic groups and compounds capable of emitting delayed fluorescent light

Methodology Applied

Scientific EffectEnergy transfer:

Implementation Method 3

a fourth compound capable of emitting delayed fluorescent light

Methodology Applied

Scientific EffectDelayed fluorescence:

Implementation Method 4

Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit from an excited state to a ground state to thereby generate light.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12520717B2Light-emitting device and electronic apparatus including same

Publication Date: 2026.01.06 SAMSUNG DISPLAY CO LTD

AI summary

A light-emitting device includes a first compound represented by Formula 1; and a second compound, a third compound, a fourth compound, or any combination thereof, each having a specific formula:emitting device may have excellent driving voltage, current density, high luminescence efficiency, and long lifespan, and may be used in the manufacture of a high quality electronic apparatus.