More efficient solar energy harvesting in algae reactors

Sustainable biomass production is expected to be one of the major supporting pillars for future energy supply, as well as for renewable material provision. Algal beds represent an exciting resource for biomass/biofuel, fine chemicals and CO2 storage. Similar to other solar energy harvesting techniques, the efficiency of algal photosynthesis depends on the spectral overlap between solar irradiation and chloroplast absorption. Here we demonstrate that spectral conversion can be employed to significantly improve biomass growth and oxygen production rate in closed-cycle algae reactors. For this purpose, we adapt a photoluminescent phosphor of the type Ca0.59Sr0.40Eu0.01S, which enables efficient conversion of the green part of the incoming spectrum into red light to better match the Qy peak of chlorophyll b. Integration of a Ca0.59Sr0.40Eu0.01S backlight converter into a flat panel algae reactor filled with Haematococcus pluvialis as a model species results in significantly increased photosynthetic activity and algae reproduction rate. Together with colleagues from the University of Erlangen and the Bavarian Center for...
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Research on Bi-doped glasses among most-cited papers of J. Non.-Cryst. Solids

One of our recent manuscripts on Bi-doped glasses has been highlighted among the top 25 papers (out of 3.300) of the Journal of Non-Crystalline Solids which have received the most citations since 2008. In the paper, we discuss the nature of ultrabroad near-infrared photoluminescence from Bi-doped glasses and crystals, a topic which is presently of sigificant interest due to the potential of such materials as broadband optical amplifiers or fiber laser sources. (link) Reference: Peng, M., Dong, G., Wondraczek, L., Zhang, L., Zhang, N., Qiu, J. Discussion on the origin of NIR emission from Bi-doped materials. J. Non-Cryst. Solids 357, 2241-2245 (2011)....
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Open PhD Positions

We are presently looking for 1 research associate / Ph.D candidate to join our group. Applications are invited until all positions are filled. Positions are available on the following fields: fabrication of all-solid photonic crystal fibers by pressure-assisted melt-infiltration of silica matrices If you are interested in one of the topics, please contact Prof. Dr.-Ing. Lothar Wondraczek Friedrich-Schiller-Universität Jena Lehrstuhl für Glaschemie II Fraunhoferstrasse 6 D-07743 Jena E-Mail: glas@uni-jena.de...
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