The flexible Ca-test: An improved performance in a gas permeability measurement system

Eun Ho Song, Young Wook Park, Jin Hwan Choi, Tae Hyun Park, Jin Wook Jeong, Hyun Ju Choi, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A flexible performance permeability measuring test for flexible organic light-emitting diodes is described in this paper. A single thin film layer of gas barriers is constructed on polyethersulfone (PES). The barrier coats the upper and lower surfaces of the PES layer. Two PES samples, one coated with Al2O3 on both surfaces and the other coated on a single surface, were made for comparison. According to this test, the time-dependent transmission curve of the one sided barrier sample had a linear slope which measured 1.65 gm2day at room temperature at a 50 relative humidity. This result shows that the measurement time is about 182 faster than has been achieved with the conventional test structure that uses a glass substrate. In addition, this measurement structure not only reduces the inevitable electrical noise which occurs during measurement but also increases the water vapor permeation signal. These effects improve the sensing reliability of the test. In addition, this structure is flexible, so one can instantly detect barrier performance changes when applying external stress.

Original languageEnglish
Article number054702
JournalReview of Scientific Instruments
Issue number5
Publication statusPublished - 2011 May

Bibliographical note

Funding Information:
This work was supported by the RFID R&D program of MKE/KEIT. [10035225, Development of core technology for high performance AMOLED on plastic.]

Copyright 2011 Elsevier B.V., All rights reserved.

ASJC Scopus subject areas

  • Instrumentation


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