Coordination Compound Film for OLED Efficiency

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Solution Overview

Problem

Current organic light-emitting devices face limitations in achieving high efficiency and long lifespan due to issues with exciton conversion rates and color purity in their emission layers.

Innovation Solution

A film incorporating a coordination compound with a heterocyclic structure and an electron donor ligand is used in the emission layer, which accelerates reverse intersystem crossing without compromising color purity, enhancing the device's efficiency and lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional emission layers are used in organic light-emitting devices, then device structure is simple, but exciton conversion rate is low and efficiency is limited

Engineering Contradiction:

Improvedevice efficiencyVSAvoidemission layer structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The emission layer employs a composite material system consisting of a heterocyclic compound (A1) with formula (1-1) coordinated with ligands (L1) containing electron donor atoms. This coordination compound structure enables efficient exciton conversion while maintaining device performance, resolving the contradiction between efficiency improvement and structural complexity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies molecular parameters by introducing specific heterocyclic structures with formulas (1-1) and coordinating ligands with electron donor atoms. These parameter changes in molecular structure and composition enable enhanced exciton conversion rates and device efficiency without excessive structural complexity

Inventive Principle:

Principle #35Parameter changes

2Productivity

If emission layers are designed for high efficiency, then exciton conversion rate improves, but color purity deteriorates

Engineering Contradiction:

Improveexciton conversion rateVSAvoidcolor purity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The heterocyclic compound (A1) with formula (1-1) and its coordinated ligands (L1) exhibit local quality optimization where specific molecular regions contribute to exciton conversion while other regions maintain color purity. The coordinated structure enables different parts of the molecule to fulfill different functional requirements simultaneously

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

By changing molecular parameters through the coordination of ligands (L1) containing electron donor atoms with the heterocyclic compound (A1), the patent achieves both high exciton conversion rate and maintained color purity. The specific coordination geometry and electronic structure parameters enable dual optimization of efficiency and color quality

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If conventional materials are used, then device lifespan is limited, but reverse intersystem crossing rate is slow

Engineering Contradiction:

Improvedevice lifespanVSAvoidreverse intersystem crossing rate

Core Design Contradiction:

Duration of action of stationary objectVSSpeed

Solution Approach 1:

The patent replaces conventional emission materials with coordination compounds featuring heterocyclic structures (A1) and electron donor ligands (L1). This substitution introduces new mechanisms for exciton management including enhanced reverse intersystem crossing, which accelerates triplet exciton conversion and extends device operational lifespan through improved exciton utilization

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 film improves the efficiency and longevity of organic light-emitting devices by accelerating reverse intersystem crossing and maintaining high color purity, making it suitable for high-efficiency and long-lifespan performance.

Implementation Method 1

Methodology Applied

Scientific EffectReverse intersystem crossing:

Implementation Method 2

accelerates reverse intersystem crossing without compromising color purity, enhancing the device's efficiency and lifespan

Methodology Applied

Scientific EffectColor purity maintenance:

Implementation Method 3

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

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20220393109A1Film and light-emitting device including the same

Publication Date: 2022.12.08 SAMSUNG DISPLAY CO LTD

AI summary

Provided are a film including a coordination compound and a light-emitting device including the film, wherein the coordination compound has a novel structure in which a ligand including an electron donor atom is coordinated to a boron atom in a heterocyclic compound.