Transparent Water-Absorbing Compound for OLED Passivation
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Solution Overview
Problem
Existing absorbents for optical elements, such as organic light-emitting diodes (OLEDs), face challenges in maintaining light-emitting properties due to water and oxygen ingress, leading to degradation and reduced lifespan, especially in upper light-emitting display elements where traditional materials like alkaline earth metal oxides are opaque and ineffective, and polymer-based absorbents lack sufficient water absorption.
Innovation Solution
A water-absorbing compound represented by Chemical Formula 1, produced using an inert solvent, is used to create an absorbent with high light transmission and a passivation layer that minimizes water ingress, comprising a thermoplastic resin with low water content and a softening temperature of 50-200°C, allowing for effective sealing and prolonged light-emitting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkaline earth metal oxides (BaO, CaO) are used as absorbents, then water absorption capability is improved, but light transmission is blocked making them unsuitable for upper light-emitting display elements
Solution Approach 1:
The patent changes the physical and chemical parameters of the absorbent material by using organic metal compounds with specific molecular structures (formula 1) instead of traditional inorganic oxides. This transformation allows the material to maintain high water absorption capability while achieving transparency in the visible light range, thus resolving the contradiction between water absorption and light transmission.
Solution Approach 2:
The patent employs composite material strategy by combining organic metal compounds with specific functional groups (carboxyl, hydroxyl, amino groups) to create a new class of absorbent materials. These composite structures provide both the chemical reactivity needed for water absorption and the optical transparency required for display applications.
2Illumination intensity
If polymer absorbents (polyvinyl alcohol, nylon) are used, then light transmission is improved, but water absorption capability is insufficient
Solution Approach 1:
The patent modifies the chemical parameters of polymer materials by introducing specific functional groups (carboxyl, hydroxyl, amino groups) and controlling molecular weight and structure. These parameter changes enhance the water absorption capability while maintaining the transparent amorphous structure that enables light transmission.
Solution Approach 2:
The patent applies local quality principle by creating regions with different functional groups within the polymer structure. The carboxyl, hydroxyl, and amino groups are distributed to provide localized water absorption sites while the overall polymer matrix maintains transparency, thus achieving both light transmission and sufficient water absorption.
3Reliability
If inorganic particle absorbents are distributed, then water absorption is achieved, but light scattering occurs reducing transmittance
Solution Approach 1:
The patent changes the fundamental parameter of material phase by transitioning from particulate inorganic absorbents to molecular-level organic metal compounds. This eliminates light scattering caused by particle interfaces and boundaries, achieving complete transparency while maintaining water absorption through chemical reactions at the molecular level.
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 solution provides a high water absorption rate, maintaining light-emitting properties for a long period and preventing damage to optical elements, with at least 50% light transmission at 550 nm, suitable for both top and bottom light-emitting OLEDs, and applicable to various display technologies like OLEDs, LCDs, and PDPs.
Implementation Method 1
alkaline earth metal oxides, such barium oxide (BaO) or calcium oxide (CaO) are widely researched because they can surely capture water molecular and also cannot release water molecular at high temperature not like a water absorbent, such as silica gel or zeolite, that absorbs physically water
Implementation Method 2
fixing the sealing cap to the substrate 1 by using an adhesive 7
Implementation Method 3
various technologies to seal the organic EL element for suppressing the contact with water and oxygen are researched
Data Source
AI summary
The present invention relates to an absorbent and a passivation layer for an optical element comprising the same, and more specifically to an absorbent that can be applied to a flexible substrate while blocking the inflow of water, and also not blocking light, and a passivation layer for the optical element comprising the same. Also the present invention relates to an absorbent that can maintain a light-emitting property for a long period of time by minimizing damage to the optical element by using the compound synthesized using a non-polar solvent, and the passivation layer for the optical element comprising the same.