Development and characterization of adjustable refractive index scattering epoxy acrylate polymer layers

Thomas Eiselt; Jan Preinfalk; Uwe Gleißner; Uli Lemmer; Thomas Hanemann

doi:10.1117/12.2235905

23 September 2016 Development and characterization of adjustable refractive index scattering epoxy acrylate polymer layers

Thomas Eiselt, Jan Preinfalk, Uwe Gleißner, Uli Lemmer, Thomas Hanemann

Author Affiliations +

Proceedings Volume 9939, Light Manipulating Organic Materials and Devices III; 99390Q (2016) https://doi.org/10.1117/12.2235905
Event: SPIE Organic Photonics + Electronics, 2016, San Diego, California, United States

Abstract

This work presents different polymer diffusing films for optical components. In optical applications it is sometimes important to have a film with an adjusted refractive index, scattering properties and a low surface roughness. These diffusing films can be used to increase the efficiency of optical components like organic light emitting diodes (OLEDs). In this study three different epoxy acrylate mixtures containing Syntholux 291 EA, bisphenol a glycerolate dimethacrylate, Sartomer SR 348 L are characterized and optimized with different additives. The adjustable refractive index of the material is achieved with a chemical doping by 9-vinylcarbazole. Titanium nanoparticles in the mixtures generate light scattering and increase the refractive index additionally. To prevent sedimentation and agglomeration of these nanoparticles, a stabilization agent [2-(2-methoxyethoxy)ethoxy]acetic acid is added to the mixture. Other ingredients are a UV-starter and thermal starter for the radical polymerization. A high power stirrer (ultraturrax) is used to mix and disperse all chemical substances together to a homogenous mixture. The viscosity behavior of the mixtures is an important property for the selection of the production method and gets characterized.

After the mixing, the monomer mixture is applied on glass substrates by blade coating or screen printing.

To initiate the chain growing (polymerization) the produced films are irradiated for 10 minutes long with UV light (UV LED Spot Hönle, 405 nm). After this step a final post bake from the layers in the oven (150°C, 30 min.) is operated.

Light transmission measurements (UV-Vis) of the polymer matrix and roughness measurements complement the characterization.

Citation Download Citation

Thomas Eiselt, Jan Preinfalk, Uwe Gleißner, Uli Lemmer, and Thomas Hanemann "Development and characterization of adjustable refractive index scattering epoxy acrylate polymer layers", Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 99390Q (23 September 2016); https://doi.org/10.1117/12.2235905

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