It is well known that proper encapsulation is crucial for the lifetime of organic light‐emit‐ting‐diode (OLED) displays. With the development of increasingly better barrier coatings and perimeter seals, it has now become very desirable to be able to precisely measure the rate of water‐vapor and oxygen permeation through barrier coatings and perimeter sealing. This paper demonstrates a new permeation‐measurement method that uses tritium‐containing water (HTO) as a tracer material. The theoretical detection limit of this direct method is 2.4 × 10−8 g/(m2‐day).
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Dunkel et al. (2005) studied this question.
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