Heterocyclic Host Compounds for Exciton Confinement in Emission Layers

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Solution Overview

Problem

Existing light-emitting devices face challenges in achieving high luminescence efficiency and stability due to the diffusion of triplet excitons into neighboring layers, particularly in hole transport and electron transport layers.

Innovation Solution

Incorporation of a heterocyclic compound represented by Formula 1, which acts as a host material in the emission layer, inhibits pi-conjugation between benzene rings, enhances triplet energy levels, and reduces intermolecular attraction through steric hindrance, thereby preventing exciton diffusion and improving luminescence efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional emission layers are used, then device structure is simple, but triplet excitons diffuse into neighboring layers causing low luminescence efficiency

Engineering Contradiction:

Improveluminescence efficiencyVSAvoidemission layer structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent changes the molecular structure parameters of the emission layer material by introducing a specific heterocyclic compound with formula (1) containing X11-X12 core structure. This structural parameter change increases triplet energy level and reduces intermolecular attraction, thereby preventing exciton diffusion while maintaining simple device structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite approach by combining the heterocyclic compound (formula 1) with other emission layer materials to create a composite emission layer system. This composite material approach leverages the high triplet energy level and steric hindrance properties of the heterocyclic compound to block exciton diffusion while maintaining overall device simplicity.

Inventive Principle:

Principle #40Composite materials

2Productivity

If triplet energy level is increased to prevent exciton diffusion, then luminescence efficiency improves, but driving voltage increases

Engineering Contradiction:

Improveluminescence efficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent optimizes the parameter balance by carefully selecting the heterocyclic compound structure (formula 1) with specific substituents R1-R20. This structural parameter optimization increases triplet energy level to prevent exciton diffusion while controlling the energy increase to manageable levels that do not excessively raise driving voltage.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality by introducing the heterocyclic compound specifically in the emission layer where triplet exciton diffusion occurs, rather than changing the entire device structure. This localized approach prevents exciton diffusion at the critical interface without requiring system-wide energy level adjustments that would increase driving voltage.

Inventive Principle:

Principle #3Local quality

3Reliability

If heterocyclic compound with steric hindrance is used, then intermolecular attraction is reduced and exciton diffusion is prevented, but manufacturing complexity increases

Engineering Contradiction:

Improveexciton diffusion preventionVSAvoidcompound synthesis

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent addresses manufacturing complexity by providing specific structural parameters (formula 1 with defined X11-X12 core and substitutable R1-R20 groups) that guide the synthesis process. This parameter specification allows for systematic variation of substituents to optimize performance while managing synthesis complexity through established chemical modification approaches.

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 increases the triplet energy level, leading to improved luminescence characteristics, reduced driving voltage, and extended lifespan of the light-emitting device, particularly suitable for blue light emission.

Implementation Method 1

the heterocyclic compound increases the triplet energy level, leading to improved luminescence characteristics

Methodology Applied

Scientific EffectTriplet energy level enhancement:

Implementation Method 2

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

Methodology Applied

Scientific EffectLuminescence: Luminescence

Implementation Method 3

reduces intermolecular attraction through steric hindrance, thereby preventing exciton diffusion

Methodology Applied

Scientific EffectSteric hindrance:

Data Source

PatentUS20250221306A1Heterocyclic compound, light-emitting device including the same, and electronic apparatus including the light-emitting device

Publication Date: 2025.07.03 SAMSUNG DISPLAY CO LTD

AI summary

Provided are a heterocyclic compound represented by Formula 1, a light-emitting device including the same, and an electronic apparatus including the light-emitting device:wherein the detailed description of Formula 1 is the same as described in the present specification.