Nitrogen-Containing Compound for OLED Electron Blocking

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Solution Overview

Problem

Organic electroluminescent devices (OLEDs) face challenges in improving service life and efficiency while maintaining a low driving voltage.

Innovation Solution

A nitrogen-containing compound with a specific structure, including fluorine-substituted N-phenylcarbazole and dibenzofuranyl/dibenzothienyl groups, is used as an electron blocking layer to enhance thermal stability and reduce electron transport rates, thereby improving OLED performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic electroluminescent devices are used, then basic electroluminescence function is achieved, but service life and efficiency are poor

Engineering Contradiction:

Improveservice lifeVSAvoidefficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent modifies molecular parameters by introducing fluorine atoms at specific positions (m=0,1,2 and n=0,1,2) on the carbazole ring, changing electron cloud distribution and HOMO/LUMO energy levels. This parameter optimization improves both service life and efficiency by enhancing thermal stability and charge transport properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The compound combines multiple functional groups (N-phenylcarbazole, dibenzofuranyl/dibenzothienyl, and fluorine substituents) into a composite molecular structure. This composite design integrates electron-blocking, hole-transport, and thermal-stability functions into a single material, simultaneously improving service life and efficiency

Inventive Principle:

Principle #40Composite materials

2Use of energy by stationary object

If driving voltage is reduced, then energy consumption decreases, but device performance deteriorates

Engineering Contradiction:

Improvedriving voltageVSAvoiddevice performance

Core Design Contradiction:

Use of energy by stationary objectVSReliability

Solution Approach 1:

The fluorine substitution parameters (m+n≤2) are optimized to achieve appropriate HOMO/LUMO energy levels that facilitate charge injection at lower voltages while maintaining efficient electroluminescence performance, thus reducing driving voltage without sacrificing device performance

Inventive Principle:

Principle #35Parameter changes

3Productivity

If electron transport rate is increased, then current efficiency improves, but electron leakage increases reducing device stability

Engineering Contradiction:

Improvecurrent efficiencyVSAvoiddevice stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies electron-blocking properties locally at the electron blocking layer position by incorporating the nitrogen-containing compound with fluorine-substituted carbazole. This local electron-blocking capability prevents electron leakage while maintaining efficient hole transport and current efficiency in other device regions

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The nitrogen-containing compound acts as an intermediary layer between the hole transport layer and light-emitting layer, mediating charge transport by blocking electrons while allowing holes to pass through, thus preventing electron leakage without compromising current efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20230303537A1Nitrogen-containing compound, and electronic element and electronic device thereof

Publication Date: 2023.09.28 SHAANXI LIGHTE OPTOELECTRONICS MATERIAL CO LTD

AI summary

The present disclosure belongs to the field of organic light-emitting materials, and in particular relates to a nitrogen-containing compound, and an electronic element and an electronic device comprising same. The nitrogen-containing compound has a structure as shown in formula 1, wherein X is selected from O or S; m is 0, 1 or 2, n is 0, 1 or 2, and 1≤m+n≤2. The nitrogen-containing compound is used in the electronic element, so that the performance of the electronic element can be improved.