29.1: Ultra‐High Barriers for Encapsulation of Flexible Displays and Lighting Devices

Abstract

A roll‐to‐roll manufactured ultra‐high permeation barrier film based on a multilayer stack of sputtered oxide layers and ORMOCER® interlayers is presented. The reproducible large‐area water vapor transmission rate is less than 8·10−5 g/(m2d) at ambient condition. The film has been evaluated as substrate for and encapsulation of flexible organic electronic devices.

Process control for thin organic coatings using fluorescence dyes

“…Then the lacquer was coated onto an ETFE film which was corona treated before. With a rotogravure technique we were able to produce a homogeneous coating [3] with a thickness of about 1 m. The coating was cured at 60 • C and at 120 • C, respectively. There is a remarkable Table 1 Oxygen permeation of a SiO2-PET film (M401) which was coated with an ORMOCER ® which contained 100 ppm of fluorescein in the liquid (detection limit: 0.05 cm 3 /(m 2 d bar)).…”

“…Such multilayer coatings are used to reduce the permeation of oxygen and water vapor through polymer films by many orders of magnitude [2] and they are meant to be applied as flexible encapsulation materials for organic electronic devices as organic light emitting diodes (OLEDs). In the Fraunhofer POLO ® approach to ultra-barrier coatings [3] a layer of a hybrid-polymer is applied between two sputtered metal oxide layers. This intermediate coating is supposed to decouple defects in the two inorganic coatings.…”

Bio-Organic Electronics—Overview and Prospects for the Future

“…Therefore, the organic layers are protected with an encapsulation material (could be the same as the carrier substrate) and an adhesive as shown in Figure 3. It is often recommended that both the adhesive as well as the encapsulation material have to feature a water vapor transmission rate (WVTR) smaller than 10 −5 g/(m 2 day) [7]. The controversial requirements of being insensitive against water or oxygen and biodegradable at the same time are very challenging.…”

“…Polyhydroxy alkanoates (PHA) (4) and polylactic acid (PLA) (5) may derive from various sugars, fatty acids or starch. Other typical representatives are polyhydroxybutyrate-co-valerate (PHBV) (6) and polyhydroxybutyrate-co-hexanoate (PHBH) (7). Polybutylene adipate-co-terephthalate (PBAT) (8) is a polymer with aromatic fragments.…”

A Systematic Investigation of Permeation Barriers for Flexible Dye‐Sensitized Solar Cells

“…We employed in this study an ultrahigh‐barrier film, designed to show WVTR of 5×10 −5 g m −2 d −1 at ambient conditions (average WVTR measured using calcium tests on 9 spots with 3 mm diameter including pinhole defects), to protect from gas ingress our DSC devices, made of titanium foil photoanodes and transparent ITO–poly(ethylene terephthalate) (ITO–PET) counterelectrodes (CEs). Shelf life and accelerated light soaking tests were performed to study different barrier solutions and understand the barrier/device interactions and the origin of water ingress, considering different pathways.…”