Charge-Blocking Organic Light-Emitting Element for Fast Peak Emission

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Solution Overview

Problem

Existing organic light-emitting elements struggle to achieve high peak intensity and high response speed in light emission.

Innovation Solution

The organic light-emitting element includes a first electrode, a second electrode, an organic light-emitting layer, a hole transporting layer, and a charge block layer with specific energy level configurations to facilitate charge separation and recoupling, allowing for high peak intensity and rapid light emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a conventional organic light-emitting element structure is used, then light emission can be obtained, but the peak intensity and response speed are insufficient

Engineering Contradiction:

Improvelight emission peak intensityVSAvoidresponse speed

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent divides the light-emitting system into distinct functional layers: an organic light-emitting layer for light generation and a charge block layer for charge management. This segmentation allows independent optimization of each layer's properties to achieve both high peak intensity and fast response speed simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The charge block layer acts as an intermediary between the electrodes and the organic light-emitting layer. It mediates charge transport by blocking electrons while allowing holes to reach the emitting layer, thereby controlling charge recombination dynamics to achieve high peak intensity and fast response.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If excitation light is incident to the organic light-emitting layer, then charge separation occurs, but without proper charge management the light emission efficiency is reduced

Engineering Contradiction:

Improvelight emission efficiencyVSAvoidcharge recombination efficiency

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent converts the potentially harmful effect of uncontrolled charge accumulation into a beneficial mechanism. The charge block layer intentionally blocks electron transport, creating a buildup of charges that enhances radiative recombination efficiency and light emission productivity when voltage is applied.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the energy level parameters of the charge block layer (LUMO level shallower than organic light emitters) to control charge transport behavior. This parameter optimization ensures efficient charge separation during excitation and controlled recombination during emission, maximizing light emission efficiency.

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 solution enables light emission with high peak intensity and high response speed by effectively trapping electrons and promoting hole mobility, resulting in efficient light emission.

Implementation Method 1

separation of charges occurs due to incidence of the electromagnetic wave

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Implementation Method 2

The charge block layer has a LUMO level shallower than a LUMO level of organic light emitters included in the organic light-emitting layer

Methodology Applied

Scientific EffectEnergy level alignment:

Implementation Method 3

a hole transporting layer disposed between the first electrode and the organic light-emitting layer

Methodology Applied

Scientific EffectCharge transport:

Implementation Method 4

when a potential difference between the first electrode and the second electrode is caused to vary so that recoupling of charges occurs, light emission from the organic light-emitting layer can be obtained

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12414431B2Organic light-emitting element, light-emitting device, and light-emitting method

Publication Date: 2025.09.09 HAMAMATSU PHOTONICS KK

AI summary

Provided is an organic light-emitting element that is excited by an electromagnetic wave. The organic light-emitting element includes: a first electrode; a second electrode disposed to face the first electrode; an organic light-emitting layer disposed between the first electrode and the second electrode, where separation of charges occurs due to incidence of the electromagnetic wave; a hole transporting layer disposed between the first electrode and the organic light-emitting layer; and a charge block layer disposed between the second electrode and the organic light-emitting layer. The charge block layer has a LUMO level shallower than a LUMO level of organic light emitters included in the organic light-emitting layer.