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0602649_Sardar

Spectroscopic Analysis of Rare-Earth-Doped Yttrium Oxide Nanocrystals Dhiraj Sardar, University of Texas at San Antonio, DMR-0602649.

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0602649_Sardar

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  1. Spectroscopic Analysis of Rare-Earth-Doped Yttrium Oxide NanocrystalsDhiraj Sardar, University of Texas at San Antonio, DMR-0602649 Ceramic and single-crystal rare-earth (RE) doped oxides and Y2O3 have been studied and implemented for a variety of photonic applications. Due to their optical isotropy and high optical quality, the cubic phase of the yttrium oxide ceramics makes them highly desirable over single crystals. However, until now, RE doped oxides in their nanocrystalline form have lacked the detailed spectroscopic analysis of their ceramic counterparts. We have reported detailed spectroscopic analyses, including a crystal field analysis, for nanocrystalline Er3+:Y2O3 and Nd3+:Y2O3 that have shown profound similarity between the nanocrystals and polycrystalline ceramics. Our spectroscopic studies of the RE3+:Y2O3 suggest that the nanocrystals could be an inexpensive alternative to ceramic crystals. Comparison of room temperature absorption spectra for commercially produced polycrystalline ceramic Nd3+:Y2O3 (top) and laboratory synthesized nanocrystalline Nd3+:Y2O3(bottom). Gruber, Sardar, Nash, & Yow, J. Applied Physics, 102 (2007).

  2. Spectroscopic Analysis of Rare Earth Doped Yttrium Oxide NanocrystalsDhiraj Sardar, University of Texas at San Antonio, DMR-0602649 One important application of rare earth doped nanocrystals is biosensor. Due to their relatively strong fluorescence, long lifetimes, and lack of toxicity, these nanocrystals could serve as excellent reporters in biological applications such as immunoassays. Using bioresonance energy transfer (BRET) and manipulation of the particles surface chemistry, it may be possible to use the visible fluorescence from a donor bio-molecule to excite the acceptor (nanocrystals) which in turns emits in the near infrared from 0.9 to 1.5 mm. This wavelength range is also appropriate for biological tissues since they are within the water-window range where there is low scattering and absorption by water molecules. Nd3+:Y2O3 has potential as a biosensor in the form of an electro-optic taggant. Bioresonance energy transfer (BRET) relies on a significant overlap of the luminescence of a donor (firefly luciferase) and the absorption of an acceptor (Nd3+:Y2O3 nanocrystals).

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