Organic EL Device Lifetime via Specific Emitter and Transport Compounds

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Solution Overview

Problem

Existing organic electroluminescence devices have a short lifetime, limiting their performance and durability.

Innovation Solution

The use of a specific compound with a particular structure for the emitting layer and another compound with a specific structure for the electron-transporting layer, as defined by formulas (21), (41), and (51) for the emitting layer and formula (B1) for the electron-transporting layer, respectively, in the organic electroluminescence device configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If conventional compounds are used for the emitting layer and electron-transporting layer, then the device can be manufactured with existing materials, but the lifetime of the organic EL device is insufficient

Engineering Contradiction:

Improvelifetime of organic EL deviceVSAvoiddevice performance durability

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent applies parameter changes by modifying the chemical structure of the compounds used in the emitting layer and electron-transporting layer. Specifically, it introduces compounds with particular molecular structures (formula 21 for emitting layer with specific Z, Ra, Rb, Rc, n21, n22 parameters and formula B1 for electron-transporting layer with AA, BB, L, CC, n parameters) to optimize device lifetime and reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining specifically structured compounds in the emitting layer (formula 21, 41, or 51) with specifically structured compounds in the electron-transporting layer (formula B1). This composite approach creates synergistic effects that extend device lifetime while maintaining 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

This configuration significantly enhances the lifetime of the organic electroluminescence device, leading to improved performance and durability.

Implementation Method 1

When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined in the emitting layer, and excitons are formed therein.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20220263032A1Organic electroluminescence device and electronic apparatus using the same

Publication Date: 2022.08.18 IDEMITSU KOSAN CO LTD

AI summary

An organic electroluminescence device comprising: a cathode, an anode, and an organic layer disposed between the cathode and the anode, wherein the organic layer comprises an emitting layer and an electron-transporting layer, the electron-transporting layer is disposed between the cathode and the emitting layer, the emitting layer comprises a first compound represented by any one of the formulas (21), (41), and (51), and the electron-transporting layer comprises a second compound represented by the following formula (B1):