Phosphepine Matrix Semiconductors for OLED Efficiency

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Solution Overview

Problem

Current organic electronic devices, such as OLEDs, face challenges in achieving high power efficiency and long lifetime due to limitations in charge carrier injection and transport materials.

Innovation Solution

Incorporation of phosphepine rings, particularly phosphepine-1-oxide rings, into semiconducting materials as charge transporting matrices, optionally with electrical dopants like metal complexes, to enhance electrical properties and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional organic charge transporting materials are used in OLEDs, then the device can operate, but the power efficiency is low and lifetime is short

Engineering Contradiction:

Improvepower efficiencyVSAvoiddevice lifetime

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent modifies the chemical structure of charge transporting materials by introducing phosphepine rings with specific substituents (electron-donating or electron-withdrawing groups) to optimize HOMO and LUMO energy levels. This parameter optimization enables more efficient charge carrier transport and injection, directly improving power efficiency while extending device lifetime through reduced degradation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite semiconducting materials by combining phosphepine-based matrix compounds with electrical dopants (such as metal complexes or organic dopants). This composite approach synergistically enhances charge carrier density and mobility, resolving the contradiction between energy efficiency and device reliability

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If conventional charge transporting materials are used, then the OLED can function, but the operating voltage is high

Engineering Contradiction:

Improveoperating voltageVSAvoiddevice efficiency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent systematically adjusts molecular parameters of phosphepine compounds including substituent types, ring fusion patterns, and conjugation extent to achieve optimal HOMO-LUMO gaps and charge transport properties. These parameter changes enable lower operating voltages while maintaining or enhancing device efficiency

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If existing semiconducting materials are used, then the device can operate, but the quantum efficiency is low

Engineering Contradiction:

Improvequantum efficiencyVSAvoidenergy utilization

Core Design Contradiction:

Loss of energyVSUse of energy by moving object

Solution Approach 1:

The invention optimizes molecular parameters of phosphepine compounds to achieve better energy level alignment with electrodes and adjacent layers, improving charge carrier injection efficiency. The modified structures also enhance exciton formation and radiative recombination, directly boosting quantum efficiency and energy utilization

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9954182B2Semiconducting material comprising a phosphepine matrix compound

Publication Date: 2018.04.24 NOVALED GMBH

AI summary

The invention is directed to a use of a compound comprising at least one phosphepine ring as matrix material in semiconducting materials, the semiconducting material as well as electronic devices. The phosphepine ring matrix material may be doped by a lithium complex.