Perovskite Host Material for High Mobility OLEDs

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Solution Overview

Problem

Existing host materials for organic light-emitting devices have low carrier mobility, leading to limited light emission efficiency and high production costs due to complex chemical structures and labor-intensive processes.

Innovation Solution

A perovskite-type compound with a simple chemical structure is used as a host material, offering high carrier mobility and efficient reverse intersystem crossing, reducing drive voltage and enhancing light emission efficiency while being inexpensive to produce.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional host materials are used, then the device structure is established, but carrier mobility remains low and light emission efficiency is limited

Engineering Contradiction:

Improvelight emission efficiencyVSAvoidcarrier mobility

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the fundamental parameters of the host material by introducing perovskite-type compounds with specific crystal structures and electronic properties. This includes selecting materials with appropriate band gaps, carrier concentrations, and mobility values to simultaneously achieve high light emission efficiency and high carrier mobility, resolving the contradiction between these two parameters.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If already-existing host materials with complex chemical structures are used, then certain performance characteristics are achieved, but production cost increases due to labor-intensive processes

Engineering Contradiction:

Improvedevice performanceVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs perovskite-type compounds that can be produced through simple, low-cost synthesis methods. These materials replace expensive, complexly-structured conventional host materials with cheaper alternatives that maintain or improve device performance, directly addressing the contradiction between performance and manufacturing cost.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of operation

If conventional host materials are used, then device operation is maintained, but drive voltage remains high and operational stability is limited

Engineering Contradiction:

Improvedrive voltageVSAvoidoperational stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent utilizes perovskite-type compounds that exhibit composite properties combining high carrier mobility, appropriate band structure, and stable crystal phases. These materials inherently provide low drive voltage operation while maintaining high operational stability, resolving the contradiction between ease of operation and reliability.

Inventive Principle:

Principle #40Composite materials

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 use of a perovskite-type compound as a host material in organic light-emitting devices results in high light emission efficiency, low drive voltage, and improved operational stability, while also reducing material costs.

Implementation Method 1

can readily induce reverse intersystem crossing from an excited triplet state to an excited singlet state to efficiency produce a singlet exciton

Methodology Applied

Scientific EffectReverse intersystem crossing:

Implementation Method 2

the organic light-emitting material emits light by the energy having transferred from the perovskite-type compound

Methodology Applied

Scientific EffectEnergy transfer:

Data Source

PatentUS11476435B2Film and organic light-emitting device containing perovskite-type compound and organic light-emitting material

Publication Date: 2022.10.18 KYUSHU UNIV

AI summary

Using a perovskite-type compound, an inexpensive host material having a high carrier mobility can be provided. Using a perovskite-type compound as a host material, an inexpensive organic light-emitting device having a high emission efficiency can be realized.