Mass spectrometry method was introduced to measure the gas permeability of OLED packaging materials in this paper.
Mass spectrum measuring gas permeability of barrier material have the characteristics of quick measure speed, may
measuring any gas permeability, and high sensitivity. The penetration rates and the permeability coefficient of water
vapor, oxygen and carbon dioxide permeating the encapsulation materials of OLED such as PET plastic film, UV curable
adhesive and vacuum sealing wax film have been measured by using the mass spectrometry. The results of experiments
show that the permeability coefficient of water vapor through a PET plastic film is 1.8×10-6 cm2/s, and of water vapor through UV curable adhesive is 1.2×10-6 cm2/s at temperature of 80 °C and relative humidity of 68 %. The water permeability coefficient of vacuum sealing wax at 50 °C and 92 %RH is 1.4×10-7 g/m2day. The water permeability of
vacuum sealing wax decreases an order of magnitude than that of UV curable adhesive, So Vacuum sealing wax is
suitable for the seal material in the packing of OLED than UV curable adhesive.
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