Novel UV-transparent 2-component polyurethane resin for chip-on-board LED micro lenses

  • In this work we present a novel optical polymer system based on polyurethane elastomer components, which combines excellent UV transparency with high thermal stability, good hardness, high surface tension and long pot life. The material looks very promising for encapsulation and microlensing applications for chip-on-board (CoB) light-emitting diodes (LED). The extinction coefficient k, refractive index n, and bandgap parameters were derived from transmission and reflection measurements in a wavelength range of 200-890 nm. Thermogravimetry and differential scanning calorimetry were used to provide glass transition and degradation temperatures. The surface tension was determined by means of contact angle measurements. As proof of concept, a commercial InGaN-CoB-LED is used to demonstrate the suitability of the new material for the production of microlenses.

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Author:Joachim Bauer, Marko Gutke, Friedhelm Heinrich, Matthias Edling, Vesela Stoycheva, Alexander Kaltenbach, Martin Burkhardt, Martin Gruenefeld, Matthias Gamp, Christoph Gerhard, Patrick SteglichORCiD, Sebastian Steffen, Michael Herzog, Christian Dreyer, Sigurd Schrader
Parent Title (English):Optical Materials Express
Document Type:Article
Year of Publication:2020
Publishing Institution:Technische Hochschule Wildau
Release Date:2020/08/31
First Page:2085
Last Page:2099
Copyright:© 2020 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Institutes:Fachbereich Ingenieur- und Naturwissenschaften
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 621 Angewandte Physik
DFG-geförderter Publikationsfonds:DFG-geförderter Publikationsfonds
Licence (English):OSA Open Access Publishing Agreement