Photocurable Encapsulation Composition for OLED Barrier Layers

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Solution Overview

Problem

Organic light emitting devices face deterioration in light emitting properties due to moisture and oxygen exposure, and existing encapsulation methods damage the organic barrier layer during plasma deposition, requiring a composition that provides plasma resistance, low modulus, high light transmittance, and flexibility.

Innovation Solution

A composition comprising non-silicone and silicone-based photocurable monomers, along with an initiator, forming an organic barrier layer that offers high plasma resistance, low modulus, and high light transmittance, suitable for flexible displays and easily deposited using methods like inkjet printing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If plasma deposition is used to form the inorganic barrier layer, then the encapsulation function is improved, but the organic barrier layer is etched and its encapsulation function is damaged

Engineering Contradiction:

Improveencapsulation functionVSAvoidplasma etching

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the organic barrier layer by incorporating specific silicone-based compounds (represented by Formula 1) with particular functional groups. This compositional parameter change increases plasma resistance while maintaining encapsulation functionality, resolving the contradiction between improving encapsulation and preventing plasma etching damage.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite organic barrier layer by combining silicone-based photocurable polyfunctional monomers (Formula 1) with non-silicone-based photocurable polyfunctional monomers (Formula 2). This composite material approach provides both plasma resistance and flexible encapsulation properties, resolving the contradiction between encapsulation function and plasma etching resistance.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the organic barrier layer is made more resistant to plasma, then reliability is improved, but flexibility may be compromised

Engineering Contradiction:

Improveplasma resistanceVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent adjusts the molecular structure parameters of the silicone-based monomer (Formula 1) by varying the values of n (0-30), R1-R6, and X1-X6 to optimize both plasma resistance and flexibility. The specific structural parameters allow the material to maintain flexibility while achieving high plasma resistance, resolving the contradiction between reliability and adaptability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies different functional groups at different positions in the molecular structure (R1-R6 and X1-X6 in Formula 1) to achieve local optimization. Certain positions provide plasma resistance while others maintain flexibility, allowing the material to simultaneously satisfy both requirements through localized functional differentiation.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the organic barrier layer is made thinner to improve flexibility, then adaptability is improved, but manufacturing precision becomes more difficult to maintain

Engineering Contradiction:

ImproveflexibilityVSAvoiddeposition control

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent changes the viscosity and curing characteristics of the composition by selecting specific monomer combinations and ratios. This allows for precise control of thin film formation and curing, enabling manufacturing precision even at reduced thicknesses that provide flexibility, thus resolving the contradiction between adaptability and manufacturing precision.

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 composition significantly improves the reliability of organic light emitting devices by providing a robust, flexible, and transparent organic barrier layer with a high photocuring rate and low plasma etching rate, enhancing the encapsulation of organic light emitting devices.

Implementation Method 1

a composition for encapsulation of an organic light emitting device includes: (A) a non-silicone-based photocurable polyfunctional monomer; (B) a silicone-based photocurable polyfunctional monomer; (C) a non-silicone-based photocurable monofunctional monomer; (D) a silicone-based photocurable monofunctional monomer; and (E) an initiator

Methodology Applied

Scientific EffectPhotocuring: Photopolymerisation

Data Source

PatentUS20230203225A1Composition for encapsulating organic light emitting element and organic light emitting element display device manufactured therefrom

Publication Date: 2023.06.29 SAMSUNG SDI CO LTD

AI summary

Provided are a composition for encapsulating an organic light emitting element and an organic light emitting element display device manufactured therefrom, the composition comprising: (A) a non-silicone-based photocurable multifunctional monomer; (B) a silicone-based photocurable multifunctional monomer; (C) a non-silicone-based photocurable monofunctional monomer; (D) a silicone-based photocurable monofunctional monomer; and (E) an initiator, wherein the silicone-based photocurable multifunctional monomer (B) is represented by chemical formula 1.