Organic Light-Emitting Component High-Temperature Stability

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Solution Overview

Problem

Existing organic light-emitting components face stability issues at high temperatures, particularly above 85°C, leading to degradation and reduced service life, with conventional structures experiencing significant voltage rise and luminance drop.

Innovation Solution

An organic light-emitting component with a functional layer stack comprising at least two organic light-emitting layers separated by a charge carrier generation zone, featuring an organic intermediate layer with a first charge carrier transport mechanism and an inorganic intermediate layer with a second mechanism, which differ partially, enhancing stability and efficiency at high temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic light-emitting component structures are used, then manufacturing simplicity is maintained, but stability at high temperatures deteriorates

Engineering Contradiction:

Improvestability at high temperaturesVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The charge carrier generation zone is divided into multiple sub-zones: a first charge carrier generation sub-zone with an organic intermediate layer and a second charge carrier generation sub-zone with an inorganic intermediate layer. This segmentation allows each sub-zone to contribute differently to charge carrier generation, improving high-temperature stability while managing structural complexity through functional division.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a composite structure combining organic and inorganic intermediate layers within the charge carrier generation zone. The organic intermediate layer (e.g., Alq3, BCP) provides one type of charge carrier generation mechanism while the inorganic intermediate layer (e.g., LiF, Cs2CO3) provides a different mechanism, creating a composite system that leverages the advantages of both material types for enhanced thermal stability.

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If the component operates at high temperatures, then service life is extended, but voltage rise and luminance drop occur

Engineering Contradiction:

Improveservice lifeVSAvoidvoltage stability and luminance maintenance

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent modifies the charge carrier generation mechanisms by introducing different intermediate layers with distinct properties. The organic intermediate layer facilitates hole injection while the inorganic intermediate layer facilitates electron injection, creating a balanced charge carrier generation system that maintains voltage stability and luminance performance even at elevated operating temperatures, thereby extending service life without performance degradation.

Inventive Principle:

Principle #35Parameter changes

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 component achieves high temperature stability with minimal voltage drop and extended service life, maintaining efficiency and reducing degradation, making it suitable for applications like automotive lighting.

Implementation Method 1

The organic intermediate layer preferably has a first charge carrier transport mechanism. The intermediate region has an inorganic intermediate layer. The inorganic intermediate layer preferably has a second charge carrier transport mechanism. The first charge carrier transport mechanism can at least partially differ from the second charge carrier transport mechanism.

Methodology Applied

Scientific EffectHopping mechanism:

Implementation Method 2

Methodology Applied

Scientific EffectTunneling mechanism:

Implementation Method 3

The functional layer stack has at least two organic light-emitting layers and at least one charge carrier generation zone. As a result, it is possible for each charge carrier pair which is injected into such a stack to generate a plurality of photons

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10608197B2Organic light-emitting component and lamp

Publication Date: 2020.03.31 DOLYA HOLDCO 5 LTD

AI summary

The invention relates to an organic light-emitting component (100), comprising a functional layer stack (9) between two electrodes (1, 8), wherein the functional layer stack (9) has at least two organic light-emitting layers (2, 7) and at least one charge carrier generation zone (3), which is arranged between the two organic light-emitting layers (2, 7), wherein the charge carrier generation zone (3) comprises an electron-conducting organic layer (31) and a hole-conducting organic layer (32), between which an intermediate region (4) is arranged, wherein the intermediate region (4) comprises at least one organic intermediate layer (6) which has a first charge carrier transport mechanism and an inorganic intermediate layer (5) which has a second charge carrier transport mechanism, wherein the inorganic intermediate layer (5) is arranged between the organic intermediate layer (6) and the electron-conducting organic layer (31), and wherein the first charge carrier transport mechanism is at least partially different to the second charge carrier transport mechanism.