OLED Light Emission Region Positioning for Efficiency

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing organic electroluminescence devices face challenges in enhancing device performance, particularly in achieving high light emission efficiency due to the positioning of the light emission region within the organic light-emitting layer, which is often affected by the hole and electron transport layers.

Innovation Solution

The organic electroluminescence device is configured with a hole transport layer and an organic light-emitting layer as coated films, where the hole current is larger than the electron current, and the light emission region is positioned on the electron transport layer side, reducing deactivation and improving efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the light emission region is positioned in the organic light-emitting layer, then light emission occurs, but deactivation from the hole transport layer reduces efficiency

Engineering Contradiction:

Improvelight emission efficiencyVSAvoiddeactivation loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent positions the light emission region in a specific spatial location within the device structure - on the electron transport layer side of the organic light-emitting layer. This spatial repositioning in the vertical dimension separates the light emission zone from the hole transport layer, reducing deactivation losses while maintaining efficient light generation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent creates different functional zones within the organic light-emitting layer by controlling the local concentration of host and guest materials. The light emission region is localized to specific areas with optimized material composition, ensuring high radiative recombination efficiency while minimizing deactivation from adjacent layers.

Inventive Principle:

Principle #3Local quality

2Reliability

If the electron transport layer has a narrow energy gap, then electron transport is facilitated, but energy loss increases

Engineering Contradiction:

Improveelectron transport efficiencyVSAvoidenergy gap loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent optimizes the energy gap parameter of the electron transport layer to balance two competing requirements: it is narrow enough to facilitate efficient electron transport from the cathode through the layer to the light-emitting region, but wide enough to minimize energy loss and prevent unwanted exciton generation that would lead to deactivation.

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

This configuration enhances the light emission efficiency by minimizing deactivation from the hole transport layer and allowing for a wider energy gap in the electron transport layer, thereby improving the overall device performance.

Implementation Method 1

an organic light-emitting layer configured by a coated film, having a hole current which is larger than an electron current

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10249839B2Organic electroluminescence device, organic electroluminescence unit, and electronic apparatus

Publication Date: 2019.04.02 MAGNOLIA BLUE CORP

AI summary

An organic electroluminescence device includes, in order, a first electrode, a hole transport layer, an organic light-emitting layer, an electron transport layer, and a second electrode. The hole transport layer is configured by a coated film. The organic light-emitting layer is configured by a coated film. The organic light-emitting layer has a hole current that is larger than an electron current.