Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.85: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Upconversion Quantum Yields of Rare Earth Doped Nanoparticles dependent on dopant concentration — •Martin Kaiser1, Würth Christian1, Hypännen Iko2, Emilia Palo2, Soukka Tero2, and Resch-Genger Ute1 — 1BAM Bundesanstalt für Material- forschung und -prüfung, Richard-Willstätter-Str. 11, 12489 Berlin — 2Department of Biotechnology, University of Turku, Tykistökatu 6A, FI-20520 Turku, Finland
Hexagonal β-NaYF4 doped with Er3+ and Yb3+ is currently the most efficient up-conversion (UC) or also called ’Anti-Stokes’ phosphor which converts near-infrared (NIR) to green light. The design of efficient nm-sized UC particles requires reliable spectroscopic tools for the characterization of the signal-relevant optical properties of these materials like the up-conversion quantum yield (UC QY), which equals the ratio of high energy photons emitted to low energy photons absorbed. We present here a custom-designed integration sphere setup equipped with a high-power 980 nm-laser diode for spectrally resolved and power density-dependent measurements of UC QY. Power dependent UC QY and luminecence lifetime measurements of nm-sized β-NaYF4:Er3+, Yb3+ with different dopant concentrations will be discussed.