Organic Compound Formula I for OLED Voltage Stability

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Solution Overview

Problem

Existing organic semiconductor materials in OLEDs face challenges in maintaining operating voltage stability over time, affecting the efficiency and longevity of organic electronic devices.

Innovation Solution

An organic compound of specific formula (I) is introduced, which includes various substituents and structural components that improve the hole and electron transport characteristics, leading to enhanced operating voltage stability and device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic semiconductor materials are used in OLEDs, then the device structure and basic functionality are maintained, but the operating voltage stability over time deteriorates

Engineering Contradiction:

Improveoperating voltage stabilityVSAvoiddevice lifetime

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent modifies the molecular structure of organic semiconductor materials by introducing specific substituents (fluorinated alkyl groups, aryl groups, heteroaryl groups) at defined positions in the chemical formula. These structural parameter changes optimize charge transport properties and molecular packing, leading to improved operating voltage stability and extended device lifetime without altering the basic OLED architecture.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs composite organic semiconductor materials combining multiple functional groups (electron-transporting groups, hole-transporting groups, and stabilizing substituents) within a single molecular framework. This composite structure enables simultaneous optimization of multiple properties: charge transport efficiency, operational stability, and long-term device performance.

Inventive Principle:

Principle #40Composite materials

2Productivity

If existing organic semiconductor materials are used, then the device can operate, but the external quantum efficiency is insufficient

Engineering Contradiction:

Improveexternal quantum efficiencyVSAvoidenergy loss in charge transport

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent optimizes the HOMO and LUMO energy levels of the organic semiconductor material through systematic modification of molecular structure. By adjusting substituent types and positions, the energy level alignment between different OLED layers is optimized, reducing energy barriers for charge injection and transport, thereby improving external quantum efficiency and reducing energy loss.

Inventive Principle:

Principle #35Parameter changes

3Power

If conventional organic compounds are used in the semiconductor layer, then the device functions, but the operating voltage remains high

Engineering Contradiction:

Improveoperating voltageVSAvoiddevice efficiency

Core Design Contradiction:

PowerVSProductivity

Solution Approach 1:

The invention modifies the charge transport characteristics of the organic semiconductor by changing molecular structure parameters. The introduced substituents enhance electron mobility and optimize charge carrier generation, which reduces the voltage required for device operation while maintaining or improving overall device efficiency.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3989303A1Organic compound of formula (i) for use in organic electronic devices, an organic electronic device comprising a compound of formula (i) and a display device comprising the organic electronic device

Publication Date: 2022.04.27 NOVALED GMBH

Figure 1~2
Figure 3

AI summary

The present invention relates to a compound of formula (I) and an organic electronic device comprising a semiconductor layer which comprises a compound of formula (I).