OLED Organic Compounds with Optimized HOMO Levels

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Solution Overview

Problem

Existing organic light-emitting diodes (OLEDs) face challenges in achieving saturated colors, particularly in red, green, and blue emissions, which are crucial for full-color displays.

Innovation Solution

The development of specific organic compounds, such as those described in Formulas I through V, which are designed to have a High Occupied Molecular Orbital (HOMO) level greater than −5.56 eV and exclude certain groups like indolocarbazole and phenothiazine, to enhance color saturation and efficiency in OLEDs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional organic materials are used in OLEDs, then the device structure and fabrication process are relatively simple, but the color saturation is insufficient

Engineering Contradiction:

Improvecolor saturationVSAvoidmolecular structure complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent changes the HOMO energy level parameter of organic compounds to greater than -5.56 eV, which directly improves color saturation in OLEDs while maintaining manageable molecular structures through specific chemical group selections

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces specific functional groups (carbazole, dibenzofuran, dibenzothiophene) at particular positions in the molecular structure to create localized electron-hole recombination zones that enhance color saturation without requiring complete structural redesign

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If white light emission is used in OLEDs, then the device can be simpler without color filters, but the color saturation for full-color displays is reduced

Engineering Contradiction:

Improvecolor saturationVSAvoiddevice fabrication simplicity

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

By adjusting the HOMO level parameter to >-5.56 eV and selecting specific molecular structures, the patent enables direct emission of saturated colors from the OLED material itself, eliminating the need for color filters while maintaining fabrication simplicity

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

These compounds improve the color saturation and efficiency of OLEDs by optimizing the HOMO level and avoiding certain molecular structures, leading to better performance in full-color displays.

Implementation Method 1

OLEDs make use of thin organic films that emit light when voltage is applied across the device

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250122175A1Organic electroluminescent materials and devices

Publication Date: 2025.04.17 UNIVERSAL DISPLAY CORP

AI summary

A compound having a structure of Formula I,provided. In the compounds, each of X1 to X12 is C or N; R is not hydrogen or deuterium; each RA and RB is hydrogen or a General Substituent defined herein; a HOMO level of the compound is greater than −5.56 eV; and the compound does not comprise a group selected from indolocarbazole, acridine, phenoxazine, phenothiazine, 10,10-diphenyl-5,10-dihydrodibenzo[b,e][1,4]azasiline (dibenzoazasiline), inbimbim, 3,9′ bicarbazole, and 3,3′ bicarbazole moiety. Formulations, OLEDs, and consumer products containing the compound are also provided.