TY - JOUR
T1 - Diffusion of water into permeation barrier layers
AU - Visweswaran, Bhadri
AU - Mandlik, Prashant
AU - Mohan, Siddharth Harikrishna
AU - Silvernail, Jeff A.
AU - Ma, Ruiqing
AU - Sturm, James C.
AU - Wagner, Sigurd
N1 - Publisher Copyright:
© 2015 American Vacuum Society.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Organic light emitting diodes (OLEDs) are attractive candidates for flexible display and lighting panels due to their high contrast ratio. However, the materials in an OLED are oxidized by very small quantities of moisture. Therefore, flexible OLEDs require flexible, thin-film, encapsulation. The authors introduce a set of three techniques for measuring the solubility and diffusion coefficient of water in a permeation barrier layer that is a SiO2-silicone hybrid made by plasma enhanced chemical vapor deposition. The techniques are secondary ion mass spectrometry, and measurements of electrical capacitance and of film stress. The measurements were carried out on samples exposed to water or steam at temperatures between 65 and 200 °C. From the resulting values of water solubility, diffusion coefficient, and their thermal activation energies, the authors calculate the time one monolayer of water will take to permeate through the bulk of the film. For a 3 μm thick film held at 38°C and 90% relative humidity, the time is 13 years.
AB - Organic light emitting diodes (OLEDs) are attractive candidates for flexible display and lighting panels due to their high contrast ratio. However, the materials in an OLED are oxidized by very small quantities of moisture. Therefore, flexible OLEDs require flexible, thin-film, encapsulation. The authors introduce a set of three techniques for measuring the solubility and diffusion coefficient of water in a permeation barrier layer that is a SiO2-silicone hybrid made by plasma enhanced chemical vapor deposition. The techniques are secondary ion mass spectrometry, and measurements of electrical capacitance and of film stress. The measurements were carried out on samples exposed to water or steam at temperatures between 65 and 200 °C. From the resulting values of water solubility, diffusion coefficient, and their thermal activation energies, the authors calculate the time one monolayer of water will take to permeate through the bulk of the film. For a 3 μm thick film held at 38°C and 90% relative humidity, the time is 13 years.
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U2 - 10.1116/1.4918327
DO - 10.1116/1.4918327
M3 - Article
AN - SCOPUS:84929118584
SN - 0734-2101
VL - 33
JO - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
JF - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
IS - 3
M1 - 031513
ER -