The encapsulation of an organic light-emitting diode using organic–inorganic hybrid materials and MgO

The characteristics of organic–inorganic multi-barriers were investigated in this study. Polymerized cycloaliphatic epoxy hybrid materials (hybrimers), synthesized by a sol–gel method and MgO were used as an organic and inorganic material, respectively. We performed a Ca test at 30 °C and 90% R.H. A multi-barrier of 6 dyads on 100 μm thick PET resulted in a water vapor transmission rate (WVTR) of 4.9 × 10−5 g/m2 day and optical transmittance of 81.8% in the visible region (350–850 nm). We suggested relatively simple passivation method with a solution process involving an organic material coupled with low temperature deposition of MgO using an electron beam evaporator. Due to the solution process of the organic layer, the OLEDs were passivated without dark spots or an additional protective layer. After driving of 740 h with a constant current source under ambient conditions, a half-life time of 15,000 h was estimated by the stretched exponential decay (SED) model with an initial luminance value L0 = 1000 cd/m2.

The characteristics of organic-inorganic multi-barriers were investigated in this study. Polymerized cycloaliphatic epoxy hybrid materials (hybrimers), synthesized by a sol-gel method and MgO were used as an organic and inorganic material, respectively. We performed a Ca test at 30 °C and 90 % R.H. A multi-barrier of 6 dyads on 100-μm thick PET resulted in a water vapor transmission rate (WVTR) of 4.9 × 10−5 g/m2day and optical transmittance of 81.8 % in the visible region (350 nm ∼ 850 nm). We suggested relatively simple passivation method with a solution process involving an organic material coupled with low temperature deposition of MgO using an electron beam evaporator. Due to the solution process of the organic layer, the OLEDs were passivated without dark spots or an additional protective layer. After driving of 740 hours with a constant current source under ambient conditions, a half-life time of 15000 hours was estimated by the stretched exponential decay (SED) model with an initial luminance value L0 = 1000 cd/m2.Figure optionsDownload as PowerPoint slideResearch highlights
► Organic-inorganic hybrid materials and MgO were used for multi-barriers.
► The WVTR of 4.9 × 10−5 g/m2 day and transmittance of 81.8% were obtained for the 6-dyads multi-barrier.
► The passivated OLEDs showed stable operation and feasible I-V-L characteristics.
► After driving of 740 h, the lifetime was extrapolated to 15000 h for the passivated devices.