Nitrogen-Containing Hole Transport Compounds for OLED Efficiency

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Solution Overview

Problem

There is a demand for materials that can improve the efficiency and lifespan of organic electroluminescence devices by reducing their driving voltage and increasing emission efficiency, which existing technologies have not adequately addressed.

Innovation Solution

The use of nitrogen-containing compounds in the hole transport region of luminescence devices, specifically formulated compounds that include heteroaryl groups and aryl rings, are incorporated into the device structure to enhance hole transport and electron blocking capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional materials are used in the hole transport region, then the device structure is simple, but the emission efficiency is low and lifespan is short

Engineering Contradiction:

Improveemission efficiencyVSAvoidcompound structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by modifying the chemical structure of hole transport materials through specific nitrogen-containing heteroaryl groups and aryl ring combinations. This structural parameter change enables simultaneous improvement in emission efficiency and device lifespan while maintaining reasonable structural complexity through targeted molecular design

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining nitrogen-containing heteroaryl groups with aryl rings to create hybrid organic compounds. This composite approach allows the material to exhibit both efficient hole transport properties and enhanced emission characteristics, resolving the contradiction between simplicity and performance

Inventive Principle:

Principle #40Composite materials

2Power

If existing hole transport materials are used, then the manufacturing process is simple, but the driving voltage remains high

Engineering Contradiction:

Improvedriving voltageVSAvoidmanufacturing complexity

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent changes the electrical parameters of hole transport materials by incorporating nitrogen-containing groups that modify charge carrier mobility and energy level alignment. This enables reduced driving voltage while the manufacturing process remains relatively simple, as the compounds can be synthesized using standard organic synthesis techniques

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If conventional compounds are used in the hole transport region, then the device lifespan is limited, but the compound structure is simpler

Engineering Contradiction:

Improvedevice lifespanVSAvoidcompound molecular structure

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent extends device lifespan by changing the chemical stability parameters of hole transport compounds through nitrogen-containing heteroaryl structures. These structural modifications enhance resistance to degradation from oxygen, moisture, and electrical stress, achieving longer lifespan without excessive complexity increase

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent addresses lifespan limitations by designing compounds with inherent stability features that resist degradation, effectively extending the operational life of the organic electroluminescence device without requiring complex protective systems or frequent material replacement

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS20220344596A1Luminescence device and compound including nitrogen for same

Publication Date: 2022.10.27 SAMSUNG DISPLAY CO LTD

AI summary

A luminescence device, includes: a first electrode; a hole transport region disposed on the first electrode; an emission layer disposed on the hole transport region; an electron transport region disposed on the emission layer; and a second electrode disposed on the electron transport region, wherein the hole transport region includes a compound of Formula 1:wherein in the Formula 1, the variables are described herein.