Deuterated Organic Electroluminescent Device Enhancing Lifetime

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Solution Overview

Problem

Conventional organic electroluminescent devices face challenges in achieving high current efficiency and extended lifetime, particularly as luminance increases, necessitating the development of materials with improved performance.

Innovation Solution

An organic electroluminescent device comprising an anode, a hole transport zone, a light-emitting layer, an electron transport zone, and a cathode, where each of the hole transport zone, the light-emitting layer, and the electron transport zone includes a deuterated compound, either with the same or different structures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic electroluminescent devices use standard organic materials, then device structure is simple and manufacturing is easier, but current efficiency and lifetime are insufficient

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by substituting hydrogen atoms with deuterium atoms in the organic compound structures. This isotopic substitution modifies the physical and chemical parameters of the materials, resulting in enhanced device lifetime and current efficiency without fundamentally changing the device architecture or manufacturing process

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining deuterated organic compounds with other functional materials in the electroluminescent device layers. This includes using deuterated hole transport materials, deuterated light-emitting materials, and deuterated electron transport materials in specific device zones, creating composite material systems that achieve superior performance

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If OLED luminance is increased, then display brightness is improved, but device lifetime decreases

Engineering Contradiction:

Improvedisplay brightnessVSAvoiddevice lifetime

Core Design Contradiction:

Illumination intensityVSDuration of action of stationary object

Solution Approach 1:

The patent uses parameter changes through deuterium substitution to modify the stability and degradation resistance of organic materials. This allows the device to maintain higher luminance levels for extended periods, effectively decoupling the inverse relationship between brightness and lifetime that characterizes conventional OLEDs

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If phosphorescent materials are used to achieve high luminous efficiency, then current efficiency is improved, but device lifetime remains insufficient

Engineering Contradiction:

Improvecurrent efficiencyVSAvoiddevice lifetime

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies parameter changes by using deuterated phosphorescent materials and deuterated host materials in the light-emitting layer. This isotopic modification enhances the stability of the phosphorescent system, allowing high current efficiency to be maintained over extended device operation periods

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining deuterated phosphorescent emitters with deuterated host materials and deuterated charge transport materials. This creates a synergistic composite system where the deuterated components work together to simultaneously achieve high current efficiency and extended device lifetime

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20250194417A1Organic electroluminescent device

Publication Date: 2025.06.12 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device according to the present disclosure can have overall device stability by comprising a deuterated compound in the electron transport zone.