Abstract
The water vapor transmission rate (WVTR) is limited to 10−6 g/m2/day for flexible organic light-emitting diodes. However, it is difficult to measure permeability as low as 10−6 g/m2/day with current commercial testing methods. To address this need, a developed optochemical method which is extremely sensitive to oxygen or water shows promise. In this study, an Eu complex is synthesized and characterized as a fluorescent probe for detecting traces of water molecules. The Eu-complex film dispersed in poly(ethylene oxide) has strong red fluorescence that is easily quenched by a trace of water. Based on the photoluminescence spectra, the detection limit of the film to water appears to be below 1.0 × 10−9 g/cc. This suggests that the Eu-complex film can be used as a film sensor to measure WVTRs below 10−6 g/m2/day.
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Choi, PR., Park, HH. & Koo, E. Synthesis and Characterization of Luminescent Eu(TTA)3phen in a Poly(ethylene oxide) Matrix for Detecting Traces of Water. J. Electron. Mater. 42, 927–930 (2013). https://doi.org/10.1007/s11664-013-2559-2
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DOI: https://doi.org/10.1007/s11664-013-2559-2