ESIPT Dye Metal Complexes for Saturated OLED Emission

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Solution Overview

Problem

Current organic light-emitting devices (OLEDs) face challenges in achieving saturated colors, particularly in red, green, and blue emissions, with existing phosphorescent emissive molecules not fully meeting industry standards for color accuracy and efficiency.

Innovation Solution

Development of excited state intramolecular charge transfer (ESIPT) dye compounds based on mono or dihydroxy substituted 1,3-bisiminoisoindole motif and metal complexes, which serve as ligands in OLEDs, offering modifiable structures and high photophysical properties for improved emission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If existing phosphorescent emissive molecules are used, then OLEDs can emit light, but they cannot achieve saturated colors meeting industry standards

Engineering Contradiction:

Improvecolor saturationVSAvoidcolor accuracy

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent modifies molecular parameters by introducing ESIPT dye compounds with specific hydroxy-substituted 1,3-bisiminoisoindole motifs and coordinating them with metal ions to create complexes with tailored photophysical properties. This changes the emission characteristics to achieve both color saturation and accuracy

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite emissive materials by combining organic ESIPT dye ligands with metal ions to form metal coordination complexes. These composite materials exhibit enhanced photophysical properties including improved color saturation and accuracy that neither component achieves alone

Inventive Principle:

Principle #40Composite materials

2Power

If existing emissive molecules are used, then OLEDs can operate, but emission efficiency is insufficient

Engineering Contradiction:

Improveemission efficiencyVSAvoidenergy loss

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The patent optimizes photophysical parameters by selecting specific ESIPT dye structures and metal ion combinations that maximize radiative decay rates and minimize non-radiative losses, thereby improving emission efficiency and reducing energy loss

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 ESIPT dye compounds and metal complexes enhance emission efficiency and tunability, enabling the creation of OLEDs with improved color accuracy and performance, specifically in achieving saturated colors, making them suitable for advanced display technologies.

Implementation Method 1

The present invention provides a new class of excited state intramolecular charge transfer (ESIPT) dye compounds based on mono or dihydroxy substituted 1,3-bisiminoisoindole motif

Methodology Applied

Scientific EffectExcited state intramolecular charge transfer (ESIPT):

Implementation Method 2

metal complexes containing such compounds as ligands

Methodology Applied

Scientific EffectMetal coordination complex formation:

Data Source

PatentUS9412955B2Fluorescent isoindoline dyes

Publication Date: 2016.08.09 UNIVERSAL DISPLAY CORP

AI summary

The present invention provides a new class of excited state intramolecular charge transfer (ESIPT) dye compounds based on mono or dihydroxy substituted 1,3-bisiminoisoindole motif and metal complexes containing such compounds as ligands. The present invention also provides OLEDs containing the compound and/or metal complex as the emissive material.