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Jahresbericht 2013 | Annual Report 2013

30 MISSION A major topic of the Program Division Optical Ma- terials is glass and the improvement of its properties as well as the increase of its functionality by glas- sy, organic-inorganic or ceramic coatings. A second topic is new optical materials based on nanocom- posites. Thus, novel properties can be “imported” into materials via nanoparticles with the materials remaining transparent. This method requires an ex- act control of the surface properties of the particles. A third topic is the development of glassy coatings on metals. In addition to materials development, all three areas depend on the development of economic coating techniques leading to high quality results. CURRENT RESEARCH In 2013, the focus of the basic research activities of the Program Division Optical Materials was mainly on the development of materials with photoactivity. Fluorescent ceramic particles are employed for se- cure printing to be used in documents, and for the authentication of products. To achieve this, research was started to develop a method for characterizing the fluorescence kinetics of rare earth doped fluo- ride powders. Beside the measurement setup, the development comprises also suitable protocols for measurement and data analysis. The method was tested on cubic sodium yttrium fluoride doped with neodymium, serving as a model material. The rese- arch on solar absorbers started in 2009 and was opti- mized in 2013. It will contribute to the next genera- tion of mass production of alternative solar cells like Copper-Indium-Gallium-Selenide (CIGS) (figure). zielsetzung Der Programmbereich Optische Materialien ist mit der Entwicklung neuer Materialien zur optischen Funktiona- lisierung von Oberflächen befasst. 2013 wurden Industrie- projekte und öffentlich geförderte Projekte mit diversen nationalen und internationalen Partnern durchgeführt. Im Fokus der Forschung stand die Herstellung nanopar- tikulärer Beschichtungen, die die Ausbreitung des Lichts beeinflussen können. Effekte wie Beugung und Streuung, die durch die Brechwertanpassung von Nanopartikeln und Matrizes hervorgerufen wurden, finden in Lichtmanage- mentschichten für OLEDs Anwendung. Auch Schichten aus transparenten, leitfähigen Oxiden, wie Indiumzinnoxid oder Aluminiumzinkoxid, für die Anwendung in Displays, gedruckter Elektronik und Sensorik wurden 2013 intensiv erforscht. Für Anwendungen in der Medizin wurden szin- tillierende Partikel für bildgebende Röntgendetektoren und das Einbringen neutral photochromer Farbstoffe in flexib- le und faltbare Kunststoffmaterialien für Intraokularlinsen untersucht. Dr. Peter William de Oliveira Optische Materialien / Optical Materials Dr. Peter William de Oliveira Gruppenberichte / Group Reports // Chemische Nanotechnologie / chemical nanotechnology has been head of the Pro- gram Division Optical Materials since 2005. He studied physics in Brazil and – after obtaining his master degree – started to work at the INM. In his doctoral thesis he adres- sed diffractive micro-optical components in nanocompo- site materials.

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