Effects of embedded SiO2 nanoparticles on the moisture barrier performance of inorganic/organic laminates
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Thin-film encapsulation (TFE) is essential and challenging for flexible organic/quantum dot light-emitting diodes (OLEDs/QLEDs). In this work, SiO2 nanoparticles were added into the NEA 121 polymer (s-NEA) to prolong the permeation pathways, showing good barrier property and high optical transparency. With increasing the concentration of SiO2 nanoparticles up to 20 mg/ml, the value of water vapor transmission rate (WVTR) decreased. A single s-NEA layer with silica concentration of 20 mg/ml and thickness of ~ 75 µm exhibited WVTR of 2.5 × 10−3 g/m2/day and light transmittance of above 80%. Al2O3 thin films fabricated using atomic layer deposition were inserted between s-NEA layers to form dyad-style Al2O3/s-NEA multilayers. The Al2O3 (60 nm)/s-NEA (20 µm) multilayers with 3 units exhibited WVTR of 2.6 × 10−5 g/m2/day and consistently demonstrated a significantly extended QLED lifetime.
This work was financially supported by the National Natural Science Foundation of China (No. 61775038 and No. 61904031), the National Natural Science Foundation of Fujian Province, China (2017J01758, 2017J01504 and 2019J01221), and the Program for New Century Excellent Talents in Fujian Province University.
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