Deuterated Anthracene Host OLED for Blue Pixel Efficiency

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Solution Overview

Problem

Organic light emitting diodes (OLEDs) in blue pixel regions exhibit insufficient emitting efficiency and lifespan, limiting the overall performance of organic light emitting display devices.

Innovation Solution

Incorporating a first emitting material layer with an anthracene derivative host and a pyrene derivative dopant, both with deuterated hydrogen atoms, and an electron blocking layer with an amine derivative including a polycyclic aryl group, along with a hole blocking layer using azine or benzimidazole derivatives, to enhance the efficiency and lifespan of OLEDs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional emitting materials are used in blue pixel OLEDs, then the device can be manufactured with standard materials, but the emitting efficiency and lifespan are insufficient

Engineering Contradiction:

ImprovelifespanVSAvoidmaterial selection complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent deuterates the anthracene derivative host material by replacing hydrogen atoms with deuterium atoms. This isotopic substitution changes the physical and chemical parameters of the material, specifically improving the lifespan and emitting efficiency of the blue OLED without fundamentally changing the manufacturing process or material class

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite emitting material system combining deuterated anthracene derivative host with specific dopants (pyrene, dibenzofuran, dibenzothiophene derivatives). This composite approach optimizes both lifespan and emitting efficiency by leveraging the synergistic effects of different molecular components

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional emitting materials are used in blue pixel OLEDs, then the production cost remains standard, but the emitting efficiency is insufficient

Engineering Contradiction:

Improveemitting efficiencyVSAvoidproduction cost

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

Deuterium substitution in the anthracene derivative host changes the vibrational modes and energy levels of the material, leading to improved emitting efficiency. This parameter change achieves better performance without requiring entirely new material synthesis routes, thereby controlling production cost increases

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies deuterium substitution specifically to the host material molecules in the emitting layer, rather than throughout the entire device structure. This localized modification targets the critical region for light emission, improving efficiency while minimizing the scope and cost of material changes

Inventive Principle:

Principle #3Local quality

3Reliability

If standard electron blocking materials are used, then the device structure remains simple, but the lifespan of blue OLED is limited

Engineering Contradiction:

ImprovelifespanVSAvoidmaterial composition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent selects electron blocking materials with specific molecular structures (amine derivatives with polycyclic aryl groups, azine derivatives, benzimidazole derivatives) that have optimized electronic properties. These parameter-optimized materials improve device lifespan by better controlling electron-hole recombination and reducing degradation, while maintaining reasonable structural complexity

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 significantly improves the emitting efficiency and lifespan of OLEDs while minimizing production cost increases, specifically in blue pixel regions, thereby enhancing the performance of organic light emitting display devices.

Implementation Method 1

at least one of hydrogen atoms in the anthracene derivative and the pyrene derivative is deuterated

Methodology Applied

Scientific EffectDeuterium substitution effect:

Implementation Method 2

The OLED emits light by injecting electrons from a cathode as an electron injection electrode and holes from an anode as a hole injection electrode into an emitting material layer (EML), combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

a first electron blocking layer including an electron blocking material of an amine derivative including a polycyclic aryl group and positioned between the first electrode and the first emitting material layer

Methodology Applied

Scientific EffectElectron blocking:

Data Source

PatentUS20220278282A1Organic light emitting diode and organic light emitting device including the same

Publication Date: 2022.09.01 LG DISPLAY CO LTD

AI summary

The present disclosure relates to an OLED that includes a first electrode; a second electrode facing the first electrode; a first emitting material layer including a first host being an anthracene derivative and a first dopant being a pyrene derivative and positioned between the first and second electrodes; and a first electron blocking layer including an electron blocking material of an amine derivative including a polycyclic aryl group and positioned between the first electrode and the first emitting material layer, wherein at least one of hydrogen atoms in the anthracene derivative and the pyrene derivative is deuterated.