Y2O3:Eu, nanocrystalline, phosphor, UV-fluorescence spectroscopy, lifetime, diffusion limited energy transfer, chemical vapour reaction.
Nanocrystalline (Y1-xEux)2O3 powder was synthesized via a chemical vapour reaction. X-ray diffraction revealed the structure of cubic yttria with crystallite sizes of about 5 nm. The Eu-dopand concentrations x for the samples in the range from 0.003 up to 0.165 were determined by EDX-spectra. The luminescence of the nanopowders was investigated by continuous and time-resolved UV-fluorescence spectroscopy and compared to a microcrystalline Y2O3:Eu phosphor as a reference. The emission spectra show an increasing intensity for higher doping concentrations. However, compared to the microcrystalline material the yield was significantly lower. The lifetime of the 5D0 – 7FJ transition in the nanocrystalline Y2O3:Eu was found to be significantly longer than for the microcrystalline reference sample. For increasing Eu-content the lifetime in the nanocrystalline samples decreased continuously from 3.71 ms to a value of 1.20 ms for the highest doping concentration. The concentration dependent lifetime behaviour was interpreted by energy transfer between Eu ions and from Eu ions to impurities as a competing process to the radiative 5D0 – 7F2 transition.
Faculty of Applied Science & Technology
©Harald Kaps, Mohammad Lutful Arefin, Ulrich Herr, Heiko Paul
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Original Publication Citation
Kaps, H., Arefin, M. L., Herr, U., & Paul, H. (2007). Concentration dependent fluorescence lifetime in nanocrystalline Y2O3:Eu phosphors. Solid State Phenomena, 128, 165-171. 10.4028/www.scientific.net/SSP.128.165
Kaps, Harald; Arefin, Mohammad Lutful; Herr, Ulrich; and Paul, Heiko, "Concentration Dependent Fluorescence Lifetime in Nanocrystalline Y2O3:Eu Phosphors" (2007). Publications and Scholarship. 77.