Condensed-Cyclic Compound for OLED Driving Voltage and Efficiency

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Solution Overview

Problem

Conventional organic light emitting diodes face challenges in achieving low driving voltage, high current density, high efficiency, and high luminosity while maintaining a long lifetime.

Innovation Solution

Incorporating a condensed-cyclic compound, represented by specific chemical structures, into the organic layer of an organic light emitting diode, which can function as a light emitting layer or a hole transport layer, to enhance the device's performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional organic compounds are used in the organic layer, then the device structure is simple, but the driving voltage is high and efficiency is low

Engineering Contradiction:

Improvedriving voltageVSAvoidcompound structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by modifying the molecular structure of organic compounds to condensed-cyclic structures with specific chemical formulas. This structural parameter change results in improved charge transport properties and lower driving voltage while maintaining structural simplicity through systematic molecular design

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining the condensed-cyclic compound with host materials in the organic layer to create a material system that achieves both low driving voltage and high efficiency. The composite approach allows optimization of charge transport and recombination properties

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional organic compounds are used in the organic layer, then the manufacturing process is simple, but the current density and luminosity are insufficient

Engineering Contradiction:

Improvecurrent densityVSAvoidmanufacturing process

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent achieves high current density by changing the molecular parameters of the organic compound to condensed-cyclic structures with specific formulas. These parameter changes enhance charge carrier mobility and recombination efficiency, resulting in higher current density and luminosity while maintaining ease of manufacture through established deposition techniques

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If conventional organic compounds are used in the organic layer, then the device structure is simple, but the efficiency and quantum efficiency are low

Engineering Contradiction:

ImproveefficiencyVSAvoidcompound structure

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent improves efficiency and quantum efficiency by changing the molecular structure parameter to condensed-cyclic compounds. This structural modification enhances radiative recombination efficiency and reduces non-radiative energy loss pathways, achieving high efficiency without excessive structural complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts potential harmful effects by designing condensed-cyclic structures that suppress non-radiative decay and triplet state losses. The molecular structure is optimized to transform energy that would otherwise be lost into useful light emission, improving quantum efficiency

Inventive Principle:

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

4Illumination intensity

If conventional organic compounds are used in the organic layer, then the compound is easy to synthesize, but the luminosity and lifetime are insufficient

Engineering Contradiction:

ImproveluminosityVSAvoidsynthesis difficulty

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent achieves high luminosity by changing the molecular parameters to condensed-cyclic structures with specific chemical formulas. These parameter changes enhance light emission intensity through improved radiative recombination while maintaining reasonable synthesis difficulty through systematic molecular building blocks

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 use of the condensed-cyclic compound results in organic light emitting diodes with low driving voltage, high current density, high luminosity, and extended lifetime, as demonstrated by the manufacturing examples and evaluation results.

Implementation Method 1

When a voltage is applied between the anode and the cathode, holes injected from the anode move to the light emitting layer through the hole transport layer, and electrons injected from the cathode move to the light emitting layer through the electron transport layer. The holes and electrons, which are carriers, are recombined in the light emitting layer to form excitons. These excitons are changed from an excited state to a ground state, thereby generating light.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentEP3037422B1Condensed-cyclic compound and organic light emitting diode having organic layer including the same

Publication Date: 2017.09.13 SAMSUNG DISPLAY CO LTD

Figure 1

AI summary

A condensed-cyclic compound selected from the compounds Compound 1-1; Compound 1-2; Compound 1-3; or Compound 1-4.