Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.10: Poster
Montag, 26. März 2012, 17:30–20:00, Poster A
Time-resolved measurements on electron beam exposed Upconversion phosphors — •Manuela Reitzig1, Thomas Härtling1, Anton Mayer2, and Jörg Opitz1 — 1Fraunhofer Institute for Nondestructive Testing IZFP, Dresden, Germany — 2GigaTag GmbH, Oberpfaffenhofen, Germany
Since the development of infrared and Upconversion lasers and optical amplifiers, Upconversion materials have attracted significant attention. For several interesting applications trivalent rare-earth ions such as Er3+, Tm3+, Yb3+ and Y3+ were doped as luminescent centers in certain hosts such as oxysulfides and fluorides. Their unique optical properties depend on the host material and the dopant lanthanide ion and its concentration. Here we report on observation of alterations of the optical Up- and Downconversion properties due to electron beam treatment and discuss possible changes respective the crystalline and electronic structure of the material. The luminescence lifetime lasts for a few milliseconds and becomes sizably faster after electron beam treatment. We achieved to build up an optical set up we are able to obtain the decay time and spectrally resolved. With these observations we envisage a new application field for Upconversion phosphors, namely the optical, hence fast and contactless testing of e-beam irradiation. To this end rare-earth-based phosphors are placed as marker material inside or on a product packaging material. Upon electron irradiation the marker material changes its luminescent properties as a function of applied energy dose.