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Paper No P13: Measurement of Ultra‐Low Water Vapor Permeability Through Barrier‐Coated Flexible Films With Varying Temperature and Humidity for OLED
Author(s) -
Choi Byung Il,
Lee SangWook,
Woo Sang Bong,
Kim Jong Chul,
Seo Sang Joon
Publication year - 2015
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.10495
Subject(s) - oled , humidity , materials science , water vapor , relative humidity , diode , moisture , atmospheric temperature range , optoelectronics , permeability (electromagnetism) , oxygen permeability , composite material , oxygen , chemistry , meteorology , membrane , biochemistry , physics , organic chemistry , layer (electronics)
As organic light‐emitting diodes (OLEDs) and other optoelectronic materials are very vulnerable to moisture and oxygen, securing proper encapsulation is critical in the development of flexible OLED displays and other flexible electronic devices. This problem is typically solved by the use of barrier‐coated polymeric films that are composed of alternating organic/inorganic multilayers. Precision devices testing for water vapor permeability in ultra‐low range were developed in KRISS using water containing tritium. These devices are under operation to measure the range covering (10 −7 to 10 −2 ) g·m −2 ·day −1 . In this study, various studies on water vapor permeability through barrier‐coated flexible films were conducted with varying temperature and humidity, and it was observed that effects of temperature and humidity were significant. Permeability was increased a few hundred times and 15 times when increasing temperature from 23 to 80°C, and relative humidity (rh) from 6 to 72% rh, respectively. These results can provide valuable information on the reliability evaluation of flexible electronics products.