Nitrogen-Containing Carbazole Electron Blocking Layer

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Solution Overview

Problem

Organic electroluminescent devices face issues with reduced luminous efficiency and shortened service life, leading to decreased performance.

Innovation Solution

A nitrogen-containing compound with a carbazole derivative as a parent core and an aromatic amine group is used as an electron blocking layer, enhancing hole transport properties and thermal stability, thereby improving the performance of organic electroluminescent devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic electroluminescent devices are used, then the device structure is simple, but the luminous efficiency is reduced and service life is shortened

Engineering Contradiction:

Improveservice lifeVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the chemical structure parameters of the electron blocking layer by introducing nitrogen-containing carbazole derivatives with specific molecular weight ranges (300-500 g/mol) and structural features (formula I with specific substituents L1, L2, Ar1, Ar2, Ar3). These parameter changes improve carrier recombination rates and device stability, extending service life while maintaining a relatively simple single-layer structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material design by combining carbazole core structure with specific aromatic substituents (L1, L2, Ar1, Ar2, Ar3 groups) to create a novel electron blocking layer material. This composite molecular structure achieves both high luminous efficiency and extended service life by optimizing electron blocking and hole transport properties simultaneously.

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional electron blocking layers are used, then the device structure is simple, but the carrier recombination rate is low

Engineering Contradiction:

Improvecarrier recombination rateVSAvoidelectron blocking layer structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent optimizes molecular weight parameters (300-500 g/mol) and structural parameters (specific substituents in formula I) of the electron blocking layer to enhance carrier recombination rates. The nitrogen-containing carbazole derivative structure with controlled molecular weight and specific aromatic groups achieves improved carrier recombination without requiring complex multi-layer structures.

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If conventional materials are used, then the manufacturing process is simple, but the thermal stability is insufficient

Engineering Contradiction:

Improvethermal stabilityVSAvoidmanufacturing process

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The patent changes the thermal stability parameters by selecting nitrogen-containing carbazole derivatives with specific molecular weights (300-500 g/mol) and structural features (formula I with aromatic substituents). These parameter changes enhance thermal stability and device durability while maintaining compatibility with conventional vacuum deposition manufacturing processes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces conventional electron blocking layer materials with nitrogen-containing carbazole derivatives that offer superior thermal stability. This material substitution improves device reliability and thermal resistance without requiring changes to the mechanical deposition process or device architecture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 nitrogen-containing compound increases carrier recombination rates, prolongs the service life, and improves luminous efficiency and driving voltage of organic electroluminescent devices.

Implementation Method 1

enhancing hole transport properties and thermal stability, thereby improving the performance of organic electroluminescent devices

Methodology Applied

Scientific EffectHole transport: Conduction (electrical)

Implementation Method 2

When the nitrogen-containing compound of the present disclosure is used as an electron blocking layer

Methodology Applied

Scientific EffectElectron blocking: Electrical Resistance

Implementation Method 3

enhancing hole transport properties and thermal stability

Methodology Applied

Scientific EffectThermal stability: Thermal Insulation

Data Source

PatentUS20230242484A1Nitrogen-containing compound, and electronic element and electronic apparatus using same

Publication Date: 2023.08.03 SHAANXI LIGHTE OPTOELECTRONICS MATERIAL CO LTD

AI summary

The present disclosure belongs to the technical field of organic materials, and specifically disclosed are a nitrogen-containing compound, and an electronic element and electronic apparatus using the same, the nitrogen-containing compound having a structure represented by a formula F-1. When the compound of the present disclosure is used as an electron blocking layer for manufacturing an organic electroluminescent device, the service life of the organic electroluminescent device may be effectively prolonged, and the luminous efficiency or driving voltage may be improved to a certain extent.