During maskless ion etching of amorphous glass, self-organization can arise in certain etch parameter ranges, which leads to dense-lying dots/cones with typical diameters and heights in the 30-300 nm range. Another phenomenon, which results in cone sizes around 1 μm or more, is self-masking especially in the case of heterogeneous glasses like borosilicate glass as used in this contribution. Thus, a wide range of characteristic sizes and shapes of individual scatterers on the glass surface, jointly acting as a defined roughness, can be achieved resulting in specific optical scattering characteristics. This contribution gives results on borosilicate thin-glass dry etching. Certain surface morphologies are reported together with experimental results on their optical scattering characteristics.
Organic light-emitting diodes (OLEDs) using polymer blends as a single emissive layer often suffer from large color shifts with changing operational voltage. Until now, such devices cannot stand the critical demands of lighting industry. In this contribution, we introduce a pulse-width-modulation-based driver concept, enabling the user to simultaneously and independently adjust color and luminance of a single device with two contacts. This concept makes color-shifting OLEDs highly interesting for “mood-light” applications.
Immer vielfältiger sind die Einsatzgebiete für optische planare Komponenten mit mikrostrukturierten Oberflächen. In zunehmendem Maße ersetzen bzw. ergänzen sie klassische optische Komponenten wie Linsen und Spiegel. Die Vorteile von Diffraktiven Optischen Elementen (DOE) liegen in der flachen Form und dem niedrigen Gewicht. Als Materialien kommen neben Glas (in Transmission) auch Kunststoffe, Halbleiter und Metalle (für Reflexion) in Frage. In Kombination mit einem kostengünstigen Masteringund Replikationsprozess bieten DOEs bereits heute für viele Anwendungen die attraktivere Alternative.
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