Heterocyclic Emission Layer for High-Luminance OLED Response

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Solution Overview

Problem

Existing light-emitting devices face challenges in achieving high luminance, short response times, and wide viewing angles while maintaining low driving voltage and excellent response speed.

Innovation Solution

Incorporating a heterocyclic compound represented by Formula 1 into the emission layer of a light-emitting device, which includes a first and second electrode with an interlayer containing a hole transport region and electron transport region, enhancing the performance of the device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional emission layers are used, then device structure is simple, but luminance and response speed are insufficient

Engineering Contradiction:

ImproveluminanceVSAvoidemission layer composition

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The emission layer employs a composite material system comprising a host compound and a guest heterocyclic compound (Formula 1). The host material provides structural framework and charge transport, while the heterocyclic guest compound contributes high luminance and short response time characteristics. This composite approach enables synergistic performance improvement without excessive structural complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes emission layer parameters including host-to-guest concentration ratio, molecular weight ratios, and energy level alignments. By carefully controlling these parameters, the system achieves high luminance and fast response while maintaining manageable device complexity through quantitative rather than qualitative changes.

Inventive Principle:

Principle #35Parameter changes

2Speed

If conventional emission layers are used, then manufacturing is easier, but response time is slow

Engineering Contradiction:

Improveresponse timeVSAvoidemission layer fabrication

Core Design Contradiction:

SpeedVSEase of manufacture

Solution Approach 1:

The patent achieves fast response time by optimizing kinetic parameters including charge carrier mobility ratios, HOMO-LUMO energy level alignments, and concentration ratios. These parameter optimizations enable rapid charge transport and exciton recombination while maintaining compatibility with standard vacuum deposition manufacturing processes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces mechanical mixing or complex multi-step fabrication with a single-step vacuum deposition process where the emission layer is formed by depositing a solution or film containing the host-guest compound mixture. This substitution maintains ease of manufacture while achieving superior response time through molecular-level design.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If conventional emission layers are used, then device structure is simpler, but viewing angle is limited

Engineering Contradiction:

Improveviewing angleVSAvoidemission layer structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The emission layer employs local quality optimization through spatial control of host-guest compound distribution. The heterocyclic guest compound is strategically positioned at specific concentrations within the emission layer to optimize light emission characteristics for wide viewing angles while maintaining manageable structural complexity through localized rather than global modifications.

Inventive Principle:

Principle #3Local quality

4Illumination intensity

If high performance materials are used, then luminance and response speed improve, but driving voltage increases

Engineering Contradiction:

ImproveluminanceVSAvoiddriving voltage

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent optimizes energy parameters by carefully selecting host-guest compound combinations with appropriate energy level alignments. The heterocyclic guest compound is chosen to have energy levels that facilitate efficient exciton formation at low driving voltages while maintaining high luminance. Concentration ratios and molecular weight parameters are also optimized to balance performance and voltage requirements.

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 heterocyclic compound improves luminance, response speed, and viewing angle while maintaining low driving voltage, addressing the limitations of existing devices.

Implementation Method 1

Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. The excitons may transition from an excited state to a ground state, thereby generating light.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20260026260A1Light-emitting device including heterocyclic compound, electronic apparatus including the light-emitting device, and the heterocyclic compound

Publication Date: 2026.01.22 SAMSUNG DISPLAY CO LTD

AI summary

Embodiments provide a heterocyclic compound, a light-emitting device including the heterocyclic compound, an electronic apparatus including the light-emitting device, and an electronic equipment including the light emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, and the heterocyclic compound. The heterocyclic compound is represented by Formula 1, which is explained in the specification: