Organic Electroluminescent Element Ytterbium Sodium Fluoride Interface

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Solution Overview

Problem

Existing organic electroluminescent elements face challenges in improving light emission characteristics and service life, with limitations in electron current amount and stability affecting efficiency and longevity.

Innovation Solution

Incorporating a sodium fluoride electron transport layer and an ytterbium intermediate layer, with the ytterbium layer in contact with the sodium fluoride layer on the side of the cathode, to enhance electron transport and reduce degradation, forming a microcavity structure that optimizes light emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional electron transport layers are used, then device structure is simple, but electron current amount is insufficient and light emission characteristics are poor

Engineering Contradiction:

Improveelectron current amountVSAvoidlayer structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The electron transport layer is segmented into multiple sub-layers with different materials (sodium fluoride layer and ytterbium layer) to optimize electron transport at different interfaces. This segmentation allows each layer to perform its specific function, resulting in increased electron current amount while managing the complexity through functional specialization.

Inventive Principle:

Principle #1Segmentation

2Duration of action of stationary object

If conventional intermediate layers are used, then manufacturing is simple, but service life is limited due to material degradation

Engineering Contradiction:

Improveservice lifeVSAvoidlayer deposition complexity

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The ytterbium layer acts as an intermediary between the sodium fluoride electron transport layer and the cathode, mediating the interaction at the interface. This intermediary layer prevents direct contact between potentially degrading materials, reducing material degradation and extending service life, while the deposition process remains compatible with existing manufacturing techniques.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Illumination intensity

If conventional electron transport layers are used, then device structure is simple, but light emission characteristics are insufficient

Engineering Contradiction:

Improvelight emission characteristicsVSAvoidelectron transport layer structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The electron transport layer structure implements local quality by using different materials (sodium fluoride and ytterbium) at different locations (layers) to optimize electron transport and light emission at specific interfaces. This localized optimization improves light emission characteristics without requiring complete redesign of the entire device structure.

Inventive Principle:

Principle #3Local quality

4Reliability

If material degradation is not addressed, then manufacturing is simple, but electrical conductivity stability deteriorates

Engineering Contradiction:

Improveelectrical conductivity stabilityVSAvoidmaterial selection and deposition

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The ytterbium layer is deposited beforehand to cushion and protect the interface between the sodium fluoride layer and the cathode from degradation. This preventive measure stabilizes electrical conductivity by preventing material degradation before it occurs, while the deposition process uses standard techniques that maintain ease of manufacture.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 increases the electron current amount, improves light emission characteristics, and extends the service life of organic electroluminescent elements by stabilizing electrical conductivity and reducing material degradation.

Implementation Method 1

The electron transport layer includes a sodium fluoride layer

Methodology Applied

Scientific EffectElectron transport: Conduction (electrical)

Implementation Method 2

improves light emission characteristics, and extends the service life of organic electroluminescent elements by stabilizing electrical conductivity

Methodology Applied

Scientific EffectElectrical conductivity stabilization:

Implementation Method 3

organic light-emitting layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10818863B2Organic electroluminescent element, organic electroluminescent unit, and electronic apparatus

Publication Date: 2020.10.27 MAGNOLIA BLUE CORP

AI summary

An organic electroluminescent element according to one embodiment of the disclosure includes, in order, an anode, an organic light-emitting layer, an electron transport layer, an intermediate layer, and a cathode. The electron transport layer includes a sodium fluoride layer. The intermediate layer includes an ytterbium layer. The ytterbium layer is in contact with the sodium fluoride layer on side of the cathode.