Low-Volatility Getter Composition for OLED Moisture Protection
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Solution Overview
Problem
Organic light emitting diode (OLED) devices face display defects and reduced lifespan due to moisture ingress, which existing technologies fail to adequately prevent, leading to impurity formation and degradation.
Innovation Solution
A getter composition comprising a moisture-absorbing material and a binder with controlled volatility, specifically silicone or epoxy resin, is integrated between the substrates of an OLED device to absorb moisture and limit impurity concentration in the organic emission layer, preventing display defects and extending device lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a getter composition is used to absorb moisture in OLED devices, then moisture protection is improved, but impurity formation in the organic emission layer occurs due to binder volatility
Solution Approach 1:
The patent changes the volatility parameter of the binder by selecting specific resin types (silicone resin with 0.6 wt% or less weight loss, epoxy resin with 1.0 wt% or less weight loss when cured at 80-120°C) and adjusting curing conditions (temperature and time) to control the amount of impurity generation while maintaining moisture absorption functionality
Solution Approach 2:
The patent uses a composite binder system combining silicone resin and epoxy resin in specific ratios (silicone resin: 1-50 wt%, epoxy resin: 50-99 wt%) to achieve both low volatility (low impurity generation) and effective moisture absorption, leveraging the complementary properties of different materials
2Reliability
If existing getter compositions are used, then moisture absorption is achieved, but display defects and reduced lifespan occur due to insufficient moisture prevention
Solution Approach 1:
The getter composition is applied in advance between the substrate and sealing member to create a moisture barrier before moisture can ingress into the OLED device, preventing moisture-related display defects and extending lifespan through proactive protection
Solution Approach 2:
The patent uses a disposable getter composition layer that absorbs moisture over time and can be replaced or designed with sufficient initial capacity to last the device lifetime, ensuring continuous protection without requiring complex reusable systems
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 getter composition effectively absorbs moisture, reducing impurity formation and display degradation, thereby enhancing the lifespan and reliability of OLED devices by maintaining a low impurity concentration in the organic emission layer.
Implementation Method 1
a moisture absorbing material and a binder
Implementation Method 2
the binder has a volatility that results in an impurity concentration in the organic emission layer of about 400 ppm or less when heated to a temperature in the range of 60° C. to 120° C. for 2 hours
Data Source
AI summary
A getter composition including a moisture absorbing material and a binder having a volatility of 400 ppm or less when heated to a temperature in the range of 60° C. to 120° C. for 2 hours and an organic light emitting diode device including the getter composition.