Condensed Cyclic Dopant for OLED Efficiency and Lifespan

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Solution Overview

Problem

Current organic light-emitting devices face limitations in achieving high efficiency and long lifespan due to challenges in materials that can effectively enhance π-electron delocalization and provide excess electrons, leading to suboptimal π→π* and n→π* transitions.

Innovation Solution

A condensed cyclic compound with a benzene ring linked to a chrysene moiety via an oxygen or sulfur atom, which provides non-polarized π-electrons and excess electrons through delocalization, is integrated into the organic light-emitting device's emission layer, acting as a dopant to enhance efficiency and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic light-emitting materials are used, then device structure is simple, but efficiency and lifespan are limited due to insufficient π-electron delocalization

Engineering Contradiction:

Improvedevice efficiencyVSAvoidmaterial structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs composite materials by combining benzene ring structures with chrysene moieties through oxygen or sulfur linkages to create condensed cyclic compounds. This composite approach enables enhanced π-electron delocalization across the molecular structure, directly improving charge carrier mobility and device efficiency while maintaining manageable structural complexity through systematic molecular design

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies parameter changes by modifying molecular parameters such as introducing heteroatoms (oxygen or sulfur) at specific positions in the condensed cyclic structure, and varying substituent groups (R101-R114) to optimize electronic properties. These parameter adjustments enhance π-electron delocalization and improve device performance without requiring complete structural redesign

Inventive Principle:

Principle #35Parameter changes

2Duration of action of stationary object

If materials with insufficient electron delocalization are used, then manufacturing is easier, but device lifespan is reduced

Engineering Contradiction:

Improvedevice lifespanVSAvoidmaterial synthesis difficulty

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent applies segmentation by dividing the condensed cyclic compound into distinct functional modules: the benzene ring core, the heteroatom linkage (oxygen or sulfur), and the chrysene moiety with substituent groups. This modular segmentation allows for systematic synthesis through stepwise chemical reactions, improving manufacturability while achieving the desired electron delocalization for enhanced device lifespan

Inventive Principle:

Principle #1Segmentation

3Reliability

If conventional emission layer materials are used, then device structure is straightforward, but π→π* and n→π* transitions are suboptimal

Engineering Contradiction:

Improveelectronic transition efficiencyVSAvoidemission layer composition

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by strategically placing heteroatoms (oxygen or sulfur) at specific positions within the condensed cyclic structure to create localized regions of enhanced electron density and delocalization. This localized modification optimizes π→π* and n→π* transitions in the emission layer without requiring complete redesign of the overall device structure

Inventive Principle:

Principle #3Local quality

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 use of this condensed cyclic compound results in improved efficiency and a longer lifespan for the organic light-emitting device by promoting favorable electronic transitions and increasing the glass transition temperature, thereby enhancing overall device performance.

Implementation Method 1

provides non-polarized π-electrons and excess electrons through delocalization

Methodology Applied

Scientific Effectπ-electron delocalization:

Implementation Method 2

leading to suboptimal π→π* and n→π* transitions

Methodology Applied

Scientific Effectπ→π* transition:

Implementation Method 3

increasing the glass transition temperature, thereby enhancing overall device performance

Methodology Applied

Scientific Effectglass transition:

Data Source

PatentUS10026906B2Condensed cyclic compound and organic light-emitting device including the same

Publication Date: 2018.07.17 SAMSUNG DISPLAY CO LTD

AI summary

An organic light-emitting device includes a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer and a condensed cyclic compound of Formula 1. The emission layer includes a host and a dopant, and the condensed cyclic compound acts as the dopant.